Self Test Flashcards by Jared jericho

Magnetite is also known as:
A) iron ore
B) non ferrous metal
C) lodestone
D) hematite
E) limonite

C) lodestone

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An anti-friction bearing:
A) is constructed with white metal alloy
B) eliminates all bearing friction
C) wears to a smooth, low-friction surface
D) has rolling friction
E) is a sleeve bearing

D) has rolling friction

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One function of vibration absorbers is to:
A) lower noise levels
B) allow the load on the system to increase dramatically without straining the components in the system
C) increase longevity of the system
D) insulate piping and make the system more efficient
E) align piping

A) lower noise levels

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A screwdriver having a square tip is known as:
A) a slot
B) an Allen
C) a Robertson
D) a Phillips
E) a Jacobson

C) a Robertson

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The equivalent resistance of three resistances of 10, 25, and 50 ohms in parallel is \_\_\_\_\_ ohms.
A) 0.16
B) 6.25
C) 85
D) 18.75
E) 8.5

B) 6.25

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One of the disadvantages of the gravity hot water system is:
A) the water temperature must be very high to compensate for the heat losses
B) piping used must be rated for high temperature services
C) there is a slow response to changes in heat demand
D) the maximum water temperature is limited to approximately 100*C
E) high maintenance

C) there is a slow response to changes in heat demand

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The capacity of a centrifugal pump:
A) varies with discharge pressure
B) is fixed and can only be altered by changing the impeller
C) indicates that the unit is a positive displacement type
D) should be varied by suction valve manipulation
E) can be altered by speed variation only

A) varies with discharge pressure

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Temperature relief devices limit the temperature in domestic hot wate systems to no more than:
A) 50*C
B) 79*C
C) 90*C
D) 99*C
E) 121*C

D) 99*C

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In nearly all LP steam heating systems, the feedwater:
A) is condensate
B) requires daily close scrutiny of chemical values
C) contains a high percentage of makeup water
D) is deaerated
E) is softened

A) is condensate

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Large power production plants tend to be of the thermal type because they can burn solid fuels and:
A) they are the least expensive to build
B) the noise level is much less than internal combustion engines
C) the heat cycle they use is the most efficient
D) solid fuels are the most plentiful and the cheapest
E) they require the least amount of manpower

C) the heat cycle they use is the most efficient

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The control used in mechanical refrigeration systems to maintain a constant level of liquid refrigerant in the accumulator tank of a flooded evaporator is called:
A) a thermostatic expansion valve
B) an automatic expansion valve
C) a low-pressure float valve
D) a hand operated expansion valve
E) a high-pressure float valve

C) a low-pressure float valve

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If possible, you should not work any higher than \_\_\_ steps from the top of a ladder.
A) three
B) two
C) one
D) four
E) five

A) three

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Intercoolers:
A) must have a drain
B) are more efficient when cooled with air than with water
C) are used on double acting single stage compressors
D) help increase the volume of the air
E) should use an antifreeze solution

A) must have a drain

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Fibrous glass blankets, when attached to the insides of air ducts, primarily:
A) restrict the spread of smoke
B) insulate the ductwork
C) act as a fire retardant
D) attenuate transmitted mechanical noise
E) stop air leakage in the seams of the ductwork

D) attenuate transmitted mechanical noise

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When using a hammer to lightly strike a tube of a hot oil heater, a ringing sound likely indicates that the tube:
A) is free of deposits
B) has hard coke deposits
C) is empty
D) has a crack in it
E) is full

A) is free of deposits

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A transformer is a device that is used to change:
A) AC amperage to DC amperage
B) AC voltage from one value to another
C) DC amperage from one value to another
D) DC voltage to AC voltage
E) low power to high power

B) AC voltage from one value to another

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When using mechanical fuel oil atomization:
A) a 70 kPa steam pressure is required at the burner
B) dry saturated steam or superheated steam should be used
C) high pump pressure is required
D) steam pressure is required to keep the bypass open
E) 35 to 40 kPa oil pressure is required

C) high pump pressure is required

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Transformers are rated in:
A) polarity
B) service factor
C) watts
D) core temperature
E) kVA

E) kVA

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Which of the following is a programming language?
A) English
B) Word
C) Desktop publishing
D) Latin
E) Pascal

E) Pascal

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A flowing liquid has kinetic energy as a function of its velocity. When it’s velocity increases:
A) potential energy in the form of pressure will also increase
B) the cross-sectional area of the piping must increase
C) the mass quantity flowing per second will decrease
D) potential energy in the form of pressure will decrease
E) density will decrease

D) potential energy in the form of pressure will decrease

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A high flash point in oil reduces the risk of:
A) pump cavitation
B) condensation
C) vapour bubble formation
D) heat transfer
E) fire

E) fire

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The \_\_\_\_ of the completed job depends largely on the care taken during laying out.
A) time
B) accuracy
C) cost
D) price
E) size

B) accuracy

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In a meat processing plant, the sales cooler is maintained at a temperature of approximately:
A) 10*C
B) -0*C
C) -3*C
D) -11*C
E) -35*C

C) -3*C

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A circulating pump is usually:
A) connected with some kind of heat exchanger system
B) a once-through device
C) a reciprocating pump
D) a small capacity pump
E) a high head pump

A) connected with some kind of heat exchanger system

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``` Organic growths also called _____ can reduce the flow ratio in heat exchanger tubes and channels. A) algae B) slime C) fungi D) spores E) silt ```

B) slime

``` The major difference between AC and a DC generator is that a DC generator has: A) a rotor B) a commutator C) slip rings D) a field E) a stator ```

B) a commutator

``` A slight leakage is desired between the pump shafts and the packing in order to: A) prevent the ingress of air B) increase pump capacity and efficiency C) prevent wearing of the wear rings D) lubricate the shaft and packing E) prevent the pump from vapour licking ```

D) lubricate the shaft and packing

The feature of an impulse turbine that prevents a drop in pressure as the steam passes through the blades is: A) the shape of the steam passages between adjacent blades B) the lower shaft speed C) the back torque on the driver D) the higher temperature of the inlet steam E) the momentum of the load

A) the shape of the steam passages between adjacent blades

``` When joining two ropes of different diameters, we use a: A) reef knot B) sheet bend C) figure eight knot D) sheep shank E) round turn and three half hitches ```

B) sheet bend

``` Finned tube coils in air handling systems are often called: A) fish coils B) bare tube coils C) extended surface coils D) cooling coils E) heating coils ```

C) extended surface coils

Dry-bulb temperature is: A) the absolute temperature corresponding to the atmospheric pressure B) the same as the wet-bulb temperature if the relative humidity is less than 100% C) not required to find the relative humidity D) the temperature of the air measured with an ordinary thermometer E) the dew point temperature

D) the temperature of the air measured with an ordinary thermometer

``` The rotating field of an alternator is produced by applying _____ to the rotor with: A) AC power B) reactive power C) magnetic flux D) DC power E) apparent power ```

D) DC power

Which of the following is not a component of the low pressure side of a compression refrigeration system? A) compressor discharge piping B) the evaporator C) the downstream side of the expansion valve D) compressor inlet E) the suction line

A) compressor discharge piping

``` Transformers should be inspected at least: A) quarterly B) bi-annually C) semi-annually D) once or twice a year E) every five years ```

D) once or twice a year

Thermal shock to boilers can be reduced by: A) warming up boilers quickly B) allowing the boiler to develop a thin, insulating coating of scale C) slowly draining hot boilers D) preventing the full flow of cold water into a warm hot water boiler E) starting cold boilers on "automatic"

D) preventing the full flow of cold water into a warm hot water boiler

Single element feedwater control systems are very efficient in maintaining the boiler water level when: A) the boiler has a large water capacity B) the boiler is a fire tube boiler C) the fluctuations in load are slow and small D) load demands are low E) the boiler is gas fired

C) the fluctuations in load are slow and small

An entire centrifugal compressor refrigerating system, including the auxiliary equipment, can be stopped by simply pressing a stop button, unless: A) the system is automatically controlled B) the system's auxiliary equipment is not electrically interlocked C) the system's auxiliary equipment can be stopped simultaneously D) the compressor can be shut down at the same time as the other equipment E) there is a cooling demand that must be satisfied

B) the system's auxiliary equipment is not electrically interlocked

``` The residential humidifier which is commonly used in the supply plenum of smaller warm air furnaces and consists of a shallow tray partially filled with water is called a: A) bypass humidifier B) wetted element humidifier C) steam grid humidifier D) pan type humidifier E) power type humidifier ```

D) pan type humidifier

A system used extensively in hotels and motels due to its minimal space requirement, relatively low initial cost and high degree of individual zone control is called: A) a hydronic heat pump system B) an induction system C) a variable volume system with perimeter heating D) a fan coil unit with makeup air system E) a compartmental atomizing system

D) a fan coil unit with makeup air system

An advantage of an electronic control system is that: A) the controllers can accept a wide variety of inputs B) they are inexpensive to operate C) they are inexpensive to install D) the controllers can be used outdoors E) it is very compact

A) the controllers can accept a wide variety of inputs

``` Which of the following would be the best choice for a powerhouse control room installation? A) a minicomputer B) a mainframe computer C) a microcomputer D) a netbook computer E) a laptop computer ```

C) a microcomputer

``` Slow or insufficient heat in one or more rooms in a steam heated building can be caused by a faulty: A) steam trap B) condensate tank float switch C) heater D) return trap E) boiler limit control ```

A) steam trap

The purpose of the "freeze-stat" temperature controller used with hot water coils is to: A) close the outside air dampers and stop the fan if the heat source fails or the low limit temperature controller malfunctions B) prevent coil freeze-up by increasing the hot water flow through the coil to a maximum if the outside air temperature is too low C) increase the heat source temperature if the outside air temperature decreases D) shut off all water flow to the coil if a freeze condition is detected E) increase the fan output if the return air temperature is too low

A) close the outside air dampers and stop the fan if the heat source fails or the low limit temperature controller malfunctions

``` The hydrocarbons in natural gas may include: A) carbon dioxide B) ethane C) hydrogen sulphide D) nitrogen E) carbonic acid ```

B) ethane

The low water cut-off of a low pressure steam heating boiler should be tested: A) by electrician who specializes in boiler controls B) by lowering the water level, and ensuring the boiler shuts off before the water reaches the bottom of the visible part of the gage glass C) several times per shift D) for correct operation on an annual basis E) by first shutting off the burner, to prevent boiler damage if the cut-off should fail during testing

B) by lowering the water level, and ensuring the boiler shuts off before the water reaches the bottom of the visible part of the gage glass

``` An HVAC system that uses a high pressure induction system utilizes _____ to provide room air circulation. A) a nozzle arrangement B) a small fan C) several fans on one shaft D) a mixing box E) differential temperature ```

A) a nozzle arrangement

``` A pressure relief device on a refrigeration system shall have sufficient capacity to prevent the pressure in the pressure vessel from rising more than ___ above the setting of the pressure relief device. A) 11% B) 15% C) 113 kPa D) 25% E) 50% ```

A) 11%

``` The provision of outside air into a building does not: A) provide "makeup" air B) replenish the oxygen supply C) dehumidify or humidify the air D) remove doors E) ventilate the building ```

C) dehumidify or humidify the air

The two basic varieties of mechanical atomizing oil burners ar the: A) variable capacity and modulating burners B) constant and variable capacity burners C) modulating and cluster burners D) rotary and reciprocating cup burners E) light oil and heavy oil burners

B) constant and variable capacity burners

``` The performance of a heat pump system (or c.o.p.) is the ratio of: A) heat output divided by heat input B) heat input divided by energy output C) energy input divided by energy output D) energy input divided by heat output E) heat output divided by energy input ```

E) heat output divided by energy input

A time delay oil valve: A) opens when the oil pump starts B) opens 5 to 15 seconds after ignition begins C) opens on flame failure D) is located on the return line E) is upstream of the pressure regulating valve

B) opens 5 to 15 seconds after ignition begins

``` In a lithium bromide refrigeration system, which of the following is the refrigerant? A) lithium bromide B) ammonia C) freon-22 D) water E) strong aqua ```

D) water

The result of a plugged impeller will be: A) air leaks in suction line and stuffing boxes B) wrong direction of rotation C) loss of prime D) an overheated stuffing box E) no liquid being delivered

E) no liquid being delivered

``` Setpoint deviation is also called: A) derivative B) proportional band C) offset D) integral E) gain ```

C) offset

A controller is a device that primarily: A) sends or transmits a positive rather than negative signal B) tries to maintain a setpoint C) records a system's performance D) notifies operators of errors or faults in a system E) is a logic device capable of making decisions

B) tries to maintain a setpoint

``` A hot water boiler is protected from over pressure by means of: A) a temperature relief valve B) a high limit pressure control C) an expansion tank D) an overflow tank E) a safety relief valve ```

E) a safety relief valve

``` A thrust bearing which does not utilize the oil wedge principle of lubrication is the: A) michell type B) collar type C) flotation type D) kingsbury type E) vertical type ```

B) collar type

``` In order to keep some hot oil flowing backwards through a standby pump and around the discharge check valve, it is important that the _____ valve of the standby pump be left open. A) bypass B) suction C) non-return D) check E) relief ```

B) suction

Air conditioning ducts are classified as: A) low pressure and medium pressure B) low pressure, medium pressure, and high pressure C) fire resistant and flame suppressing D) thin, medium, and heavy gauge E) heating and cooling

B) low pressure, medium pressure, and high pressure

``` When like poles of a magnet are placed together, they will: A) be attracted to each other B) bend C) generate an electromotive force D) repel each other E) remain stationary ```

D) repel each other

``` A valve body that seals on the down stroke is: A) reverse acting B) single sealed C) direct acting D) double sealed E) unidirectional ```

C) direct acting

The concentration of lithium bromide in an absorption refrigerating system will change while: A) going through the expansion valve B) going through the suction valve C) cooling through the heat exchanger D) absorbing water vapour in the absorber E) going through the discharge valve

D) absorbing water vapour in the absorber

``` What is the name of the heat recovery system that consists of two finned tube heat exchangers? A) a runaround system B) a heat valve C) a heat pump D) a heat tube E) a thermal wheel ```

A) a runaround system

``` When a boiler is removed from service, it can be drained once the temperature reaches approximately: A) 150*C B) 30*C C) 50*C D) 90*C E) 70*C ```

D) 90*C

Which of these statements about heat pumps is true? A) the units discharge heat to the water piping during the cooling mode B) the piping must be insulated C) the water temperature is below the dew point of the room air D) condensate drains from each unit are not necessary E) the refrigeration system is cooled by freon, such as R-12

A) the units discharge heat to the water piping during the cooling mode

Modulating combustion control will: A) change air and fuel flow proportionally to steam pressure change B) always be at setpoint when demand is at 50% C) alter only the air flow if a selector station is on manual D) respond to changes in atmospheric pressure E) always be a cascading control system

A) change air and fuel flow proportionally to steam pressure change

``` The two major types of refrigeration systems are: A) frosting and non-frosting B) commercial and residential C) type I and type II D) indirect and direct E) high pressure and low pressure ```

D) indirect and direct

``` One of the advantages of using natural gas as a fuel in a boiler is: A) no storage space is required B) low cost C) abundance in supplies D) portability E) no standby fuel is necessary ```

A) no storage space is required

``` Refrigerant is: A) not miscible with oil B) mostly used in packing plants C) corrosive on copper D) corrosive on aluminum E) a heat transferring medium ```

E) a heat transferring medium

A CRT trend display: A) mimics a trend chart B) is dedicated to a single process C) is limited to displaying a fixed or non adjustable time period D) allows a view of only one process variable at a time E) is normally mounted beside the final control element

A) mimics a trend chart

A main advantage of steam grid humidifiers over steam pan humidifiers in HVAC systems is: A) steam grid humidifiers can use inexpensive 2-position controls B) there is minimal response time lag with steam grid humidifiers C) steam grids can achieve higher relative humidity D) steam grids do not require humidistats E) steam grid humidifiers require less space

B) there is minimal response time lag with steam grid humidifiers

``` Chain blocks are designed: A) for horizontal use B) with the top hook as the strongest C) with a very low mechanical advantage D) with the hooks stronger than the chain E) for lifting very long objects ```

B) with the top hook as the strongest

``` Modern radiators are usually made of: A) steel B) cast iron C) stainless steel D) copper E) brass ```

A) steel

``` The process of vaporization of gasoline for use in an internal combustion engine is known as: A) combustion B) atomization C) oxidization D) carburetion E) priming ```

D) carburetion

In the lithium bromide refrigeration system, what is the function of the concentrator (generator)? A) to exchange heat between the high temperature refrigerant vapour and the atmosphere B) to increase the absorbency potential of used absorbent C) to speed up the evaporation of the refrigerant D) to cool the concentrated absorbent E) to cool the refrigerant vapour

B) to increase the absorbency potential of used absorbent

The Venturi tube in the atmospheric burner mixing head has a: A) gradually decreasing cross-sectional area B) gradual increasing cross-sectional area C) uniform cross-sectional area throughout D) sharply increasing cross-sectional area E) series of internal ridges, to promote mixing

B) gradual increasing cross-sectional area

The face velocity of a heating or cooling coil is the: A) velocity of the supply water to the coil B) velocity of the air before it enters the coil C) velocity of the air after it leaves the coil D) average velocity of the air flowing over the face area of the fun surface E) velocity of the steam entering the coil

D) average velocity of the air flowing over the face area of the fun surface

In a closed vessel, the boiling point of a liquid can be raised by: A) raising the liquid level in the vessel B) lowering the pressure in the vessel C) raising the pressure in the vessel D) lowering the liquid level in the vessel E) raising the temperature in the vessel

C) raising the pressure in the vessel

``` A safety control designed to protect the chiller from freezing is the: A) vane closed switch B) low oil pressure shut down switch C) motor demand limiter D) chilled water flow switch E) purge unit ```

D) chilled water flow switch

Centrifugal pumps convert rotating mechanical energy into kinetic energy then: A) discharge the kinetic energy B) back to mechanical energy C) absorb the energy D) into potential energy in the form of pressure E) into centrifugal force

D) into potential energy in the form of pressure

The dry-bulb temperature scale is read on a psychrometric chart along the: A) left vertical axis B) right vertical axis C) saturation line and sloping downward to the right D) top horizontal axis E) horizontal axis on the bottom of the chart

E) horizontal axis on the bottom of the chart

Which of the following statements about a constant pressure water system that has a pneumatic tank is false? A) water entering directly into the pump suction is discharged into a pressurized tank B) this system is primarily used in larger buildings C) a system controller automatically starts a standby pump in the event of pump failure D) the system has a pressure regulator to maintain a relatively constant pressure above the water level inside the tank E) air must continuously be introduced into the tank

B) this system is primarily used in larger buildings

Push nipples: A) connect radiator sections together B) are tapered in the middle C) are used to connect pipes together in a heating system D) seal tighter than unions E) have decreasing cross-sectional areas from one end to the other

A) connect radiator sections together

Most conductors tend to: A) increase in resistance with increase in temperature B) decrease in resistance with increase in temperature C) shrink when heated D) increase in resistance when decreased in length E) increase in resistance over time

A) increase in resistance with increase in temperature

``` Infrared heaters are used in: A) theatres B) lecture halls C) libraries D) skating rinks E) offices ```

D) skating rinks

With antifriction bearings using grease, the bearings: A) must be cleaned twice as often as oil-lubricated bearings B) are cleaned every two years C) are cleaned less often than oil-lubricated bearings D) never require cleaning E) last twice as long as oil-lubricated bearings

C) are cleaned less often than oil-lubricated bearings

Ammonia refrigerants: A) have high sensible heat capacity B) mix well with oil C) are very expensive D) are well suited for industrial refrigeration E) are ideally suited to copper piping system

D) are well suited for industrial refrigeration

``` A "U" tube manometer may be filled with: A) a granular substance B) nitrogen C) heavy oils D) ethyl alcohol E) light oils ```

E) light oils

``` A very popular packaged boiler gas burner is the: A) ring burner B) in-duct burner C) post mix atmospheric burner D) mechanical atomizing burner E) cluster nozzle burner ```

A) ring burner

``` A steam boiler must be equipped with two low water fuel cut-off devices when the boiler: A) has over 47 m2 of heating surface B) has dual fuels C) is not continuously attended D) uses coal as fuel E) has two burners ```

C) is not continuously attended

``` According to code, the scale of a pressure gauge for a steam heating boiler shall be graduated between: A) 100 to 300 kPa B) 200 to 414 kPa C) 200 to 300 kPa D) 125 to 325 kPa E) 230 to 414 kPa ```

B) 200 to 414 kPa

In a refrigeration system controlled by a high pressure float valve, excessive refrigerant charge will cause: A) liquid carry over to the compressor B) the float chamber to become flooded C) the evaporator to be starved of refrigerant D) frost formation on the evaporator E) the compressor to run continuously

A) liquid carry over to the compressor

``` In order to keep humidifiers in top working condition, the plates of plate type units should be cleaned by soaking them in a slightly acidic solution and them washing them in soapy water to remove: A) dirt B) grease C) soot D) mineral salts E) corrosion on the plate ```

D) mineral salts

``` The injection pump of a Diesel engine is driven by: A) piston action B) the governor C) the wrist pin D) the gudgeon pin E) a camshaft ```

E) a camshaft

``` Ohms law can be stated as: A) E=IR B) R=I/E C) I=R/E D) volts equals ohms divided by amperes E) watts times ohms equals volts ```

A) E=IR

When reading the dials of a power meter, read: A) them in the sequence shown by the letters under each B) them from left to right C) the ones that rotate clockwise first D) them from right to left E) them only at the request of the utility company

D) them from right to left

``` With regard to fan capacity control, which of the following devices has a de-clutching feature? A) a fluid drive B) an outlet damper control C) a variable inlet vane control D) a variable speed motor control E) a V-belt drive ```

A) a fluid drive

Which of the following statements about vacuum breakers is false? A) they are used to prevent freeze-ups caused by negative pressure in steam heating coils B) the vacuum breaker must be installed before the control valve and as near as possible to the outlet connection of the coil C) check valves used as vacuum breakers may be left open to atmosphere D) check valves used as vacuum breakers may be connected to the condensate return header E) vacuum breakers are essential for satisfactory functioning of steam traps

B) the vacuum breaker must be installed before the control valve and as near as possible to the outlet connection of the coil

Specific humidity is the: A) ratio of the actual amount of water vapour present in the air to the amount of water vapour the air can contain when it is saturated B) same as specific volume of humid air C) actual moisture content of air expressed as kg of moisture per kg of dry air D) ratio of dry air to moisture E) moisture content of 1 kg of air at 100% relative humidity and atmospheric pressure

C) actual moisture content of air expressed as kg of moisture per kg of dry air

``` The back flow prevention method consisting of two independent check valves with an automatic operating pressure differential relief valve located between them is called: A) air gap back flow prevention B) double check valve C) reduced pressure principle device D) atmosphere vacuum breaker E) PVB ```

C) reduced pressure principle device

``` Electronic filters will remove: A) all particles from the air B) fine particles from the air C) odours D) smoke E) carbon monoxide ```

B) fine particles from the air

When the outdoor air damper of an HVAC system opens to increase the flow of fresh air, the return air damper: A) opens to reduce the recirculated air B) opens to increase the recirculated air C) closes to increase the recirculated air D) closes to reduce the recirculated air E) modulates to maintain building static pressure

D) closes to reduce the recirculated air

``` If the chilled water temperature drops approximately 2.5-3*C below the chilled water temperature set point, the chilled water low temperature cut out will: A) start the compressor B) shut down the compressor C) stop the chilled water pumps D) shut down the cooling tower fan E) start the condenser pump ```

B) shut down the compressor

``` To calculate the heat gain from fluorescent lighting, add the wattage ratings of the lamps and multiply by: A) 0.2 B) 0.5 C) 4.1 D) 1.2 E) 2.1 ```

D) 1.2

The oil pressure failure switches of a mechanical refrigeration system: A) keep the compressor oil pressure at a level where the oil will not freeze B) prevent compressor start up if the oil heater fails C) separate refrigerant dissolved in the oil from the lubricant D) shut down the compressor when the oil pressure drops below the minimum required value E) keep the oil from freezing at low pressure

D) shut down the compressor when the oil pressure drops below the minimum required value

When shutting down a boiler for internal cleaning, you should: A) shut down the boiler, then fill it completely with chemically treated water B) shut off the fire, drain, open up and flush C) allow the boiler to cool, then drain, open up, and flush it D) shut off the fire and flush with cold water to cool it off E) let it stand for a couple of days then drain

C) allow the boiler to cool, then drain, open up, and flush it

``` Clamp-on ammeter readings may be inaccurate if: A) jaws are dirty of misaligned B) circuit voltage is too high C) circuit resistance is too low D) circuit power is too high E) conductor insulation is too thick ```

A) jaws are dirty of misaligned

``` High efficiency furnaces and heaters range in annual fuel utilization efficiency (AFUE) from: A) 94-98% B) 80-98% C) 70-75% D) 60-70% E) 50-60% ```

B) 80-98%

``` Castle nuts are used: A) to simplify assembly and disassembly B) to hold shims in place C) with a square pin D) for locking square nuts in place E) with a split pin or cotter pin ```

E) with a split pin or cotter pin

``` The stator of an alternator is built of _____ mounted in a frame. A) copper alloys B) silicon steel C) carbon ring D) armature conductors E) non-metallic materials ```

B) silicon steel

``` The voltage required to force a current of 15A through a resistance of 5 ohms will be ___V. A) 0.33 B) 3 C) 7.5 D) 33 E) 75 ```

E) 75

``` The outside air is a temperature of -25*C, and is saturated. This air is drawn into the building and heated to 21*C. What is the relative humidity of the air after passing through the heating coil? (Air at -25*C holds a maximum of 0.0005 kg of moisture per kg of water, and air at 21*C holds a maximum of 0.015 kg of moisture per kg of water) A) 3.3% B) 0.15% C) 0.5% D) 10.6% E) 4.5% ```

A) 3.3%

The propeller axial flow fan: A) produces low capacity, low pressure air movement B) finds application in unit heaters, air cooled condensers, and as an exhaust fan for ventilation purposes C) is used in commercial air conditioning ducting D) requires the least power at minimum air delivery E) is used in ducted air distribution systems

B) finds application in unit heaters, air cooled condensers, and as an exhaust fan for ventilation purposes

Thermocouples are connected in series to: A) monitor more than one flame source B) increase the sensitivity of the detection system C) generate a higher voltage D) provide redundancy if one should fail E) create what is called a "flame rod"

C) generate a higher voltage

``` The standard refrigeration cycle is used to compare refrigerants and machines operating under comparable conditions. These standard conditions are: A) 1030 kPa and atmospheric pressure B) 30*C condensing and -15*C evaporating C) 30 kPa and atmospheric pressure D) -30*C condensing and 15*C evaporating E) 30 kPa and atmospheric temperature ```

B) 30*C condensing and -15*C evaporating

A bourdon tube may be manufactured in the shape of a helix so that _____ than a standard bourdon tube. A) its final output has less travel B) they can fit in narrower enclosures C) higher pressures can be sensed D) it is more powerful, and has a greater degree of rotation E) it will be less sensitive to minor pressure variations

D) it is more powerful, and has a greater degree of rotation

``` If an electrical _____ is placed across a conductor, the electrons will drift from the negative and towards the positive end of the conductor. A) potential B) current C) resistance D) wire E) meter ```

A) potential

``` At the end of the pre-purge period, the combustion programmer: A) shuts down B) opens the main fuel valve C) closes the pilot valve D) ends the ignition trial E) energizes the ignition transformer ```

E) energizes the ignition transformer

A pneumatically actuated control valve which opens on air failure has a: A) direct acting actuator and direct acting valve B) direct acting actuator and reverse acting valve C) reverse acting actuator and direct acting valve D) is typically used for a burner firing rate control valve E) is typically used for a feedwater control valve

A) direct acting actuator and direct acting valve

A control room operator notices that the stack temperature of the hot oil heater is increasing rapidly. The operator should: A) activate the emergency shutdown B) call the shift boss on the intercom C) send an operator out to see if there is smoke coming from the oil heater stack D) wait to see if the temperature will come down again E) alert the fire department

A) activate the emergency shutdown

Which of the following is a disadvantage of heat pipe heat recovery systems? A) heat pipes have high maintenance requirements B) heat pipes suffer from cross-contamination of the air streams C) heat pipes have high power consumption D) a side-by-side duct arrangement is needed E) the necessary pumps and piping are complicated and expensive to install

D) a side-by-side duct arrangement is needed

``` An automatic boiler ON/OFF or operating control switch has an adjustment for pressure set point and another for: A) a differential between the two B) manual or automatic control C) for rate of modulation D) high steam pressure limit E) rate of feedback ```

A) a differential between the two

Tie breakers are used to: A) allow the interconnection of two power sources without placing them in parallel B) break the circuit in case of overload C) protect the transformer from the power source D) protect the plant service bus from the power source E) connect the plant load to the power source

A) allow the interconnection of two power sources without placing them in parallel

Coking of the oil in hot oil heater tubes will begin to occur if: A) the oil becomes too thick B) there is too much water in the oil C) the oil temperature becomes excessively high D) the oil flow becomes excessively high E) the surge tank level becomes low

C) the oil temperature becomes excessively high

``` Shaft sealing carbon glands are: A) lubricated by the main oil pump B) limited to a temperature of 250*C C) replaced monthly due to erosion D) self-lubricating E) sprayed with Monel ```

D) self-lubricating

A two-position controller compares conditions to a set point and: A) starts or stops a process B) a controller output signal C) modulates the final control element D) automatically readjusts the set point E) maintains the final control element position at 50%

A) starts or stops a process

``` The lowest schedule for large diameter pipe (above 25.4 mm) in a hot oil system should be schedule ____. A) 20 B) 40 C) 80 D) 120 E) 160 ```

B) 40

One of the advantages of gas-fired infrared heating over other types of heating systems is: A) it can heat a large volume enclosure with little fuel B) it requires no fuel handling equipment C) it eliminates the need for ventilation D) it can provide effective spot heating E) it can be used efficiently as the main heating source fora large building

D) it can provide effective spot heating

``` The scale on the dial of the pressure or altitude gauge on a hot water heating boiler shall be graduated approximately to not less than ____ times the maximum allowable working pressure. A) 0.5 B) 1 C) 1.5 D) 2 E) 2.5 ```

C) 1.5

``` The accessory that maintains efficient heat transfer by collecting oil that coats the tubes of the condenser is called: A) strainer B) a strainer-drier C) an oil scrubber D) a filter E) an oil separator ```

E) an oil separator

``` The maximum voltage generated by a single loop DC generator occurs when the conductor is cutting the magnetic lines of force at an angle of: A) 0* B) 45* C) 90* D) 120* E) 180* ```

C) 90*

Which of the following statements about two-pipe arrangements is false? A) the arrangement is the least costly B) piping is connected to the boiler during winter C) piping is connected to the chiller during summer D) the arrangement is made up of a supply and return connection to a single coil E) the system can heat and cool at the same time

E) the system can heat and cool at the same time

A pump is capable of suction lift due to: A) its ability to convert kinetic energy into potential energy B) the speed at which it operates C) its input power D) its size E) atmospheric pressure

E) atmospheric pressure

The furnace refractory in a boiler should be ____ to prolong its life. A) wash coated with a dilute solution of heat resistant cement B) painted with heat resistant paint C) oiled D) wire brushed E) washed with a high pressure hose

A) wash coated with a dilute solution of heat resistant cement

``` A valve which gives good throttling action, takes less actuator force, but does not seal well is a: A) double seated valve B) reverse acting valve C) multiple disc valve D) single seated valve E) direct acting valve ```

A) double seated valve

``` Some water closets are provided with flush tanks while others are equipped with: A) float valves B) flushometers C) ball cocks D) drain valves E) flood valves ```

B) flushometers

``` Shaft sealing of small steam turbines is done with: A) O-rings B) compressed air C) carbon rings D) labyrinth glands E) mechanical seals ```

C) carbon rings

``` The heat recovery system which makes use of an underground heat exchange coil is called a: A) run around system B) thermal wheel C) heat tube D) heat pump E) heat pipe ```

D) heat pump

On a multiple steam boiler heating system, a stop valve must be placed at each boiler outlet to: A) permit slower system warm ups B) allow the boilers to be isolated from the system C) prevent steam from entering another boiler D) allow each boiler to supply only a part of the system E) permit different system pressures

B) allow the boilers to be isolated from the system

``` The compressed air used as atomizing air in the air atomizing oil burner is also called: A) secondary air B) primary air C) pre-mixed air D) combustion air E) post-compressed air ```

B) primary air

When using Fleming's left hand rule, the index finger represents: A) magnetic flux direction, for generators B) conductor motion direction, for motors C) conductor motion direction, for generators D) flux direction, for motors E) direction of current flow, for motors

D) flux direction, for motors

``` In a centrifugal compressor, the kinetic energy is converted to potential energy in the: A) volute, diffuser, or both B) intercooler C) diffuser only D) compressor cavity E) volute only ```

A) volute, diffuser, or both

The flow arrangement best suited for hot water coils used to heat sub-freezing air is: A) the counter flow arrangement because it is more efficient B) the parallel flow arrangement because it gives better protection against freezing C) one in which the cold air enters the coil where the coldest water is flowing D) the half serpentine E) the triple bypass flow arrangement

B) the parallel flow arrangement because it gives better protection against freezing

``` Taper, plug, and bottoming are types of: A) wrenches B) dies C) files D) punches E) taps ```

E) taps

``` When a pump discharges into a vessel operating at 300 kPa, the 300 kPa is referred to as: A) dynamic head B) equivalent head C) discharge head D) friction head E) total head ```

B) equivalent head

``` A thermocouple: A) consists of two similar wires B) produces an electrical signal C) senses infrared light from the flame D) is made of several thermopile so connected in series E) is also called a "pilot-stat" ```

B) produces an electrical signal

Refrigerants will evaporate when the: A) pressure is increased B) temperature is increased to saturation temperature C) they are diluted D) temperature is reduced below saturation temperature E) heat is removed from them

B) temperature is increased to saturation temperature

``` With all other factors being equal, a counter flow cooling tower _____ as a cross flow cooling tower. A) is not as tall B) has much less cooling capacity C) requires less floor space D) requires less fan power E) has a lower pressure drop ```

C) requires less floor space

Lock washers: A) prevent marring of the work surface B) distribute the lock nut force C) allow oversized bolts or nuts to be used D) reduce the chances of unwanted turning of the nut or bolt E) prevent the equipment from being dismantled

D) reduce the chances of unwanted turning of the nut or bolt

The specific humidity scale of a psychrometric chart is along the: A) bottom horizontal axis B) right side vertical axis C) top horizontal axis at the top of the chart D) left saturation line E) left side vertical axis and left side

B) right side vertical axis

Boiler blowoff piping: A) can be reduced in size after the blowdown valves B) must be full size to the point of discharge C) must be at least 51 mm in size D) can have valves of a smaller size than piping E) may discharge to the sewer system

B) must be full size to the point of discharge

A steam heating boiler that is to be shut down for six months during the summer, should be: A) drained, thoroughly dried out, have desiccant placed inside, and be left open B) drained, thoroughly dried out, have desiccant placed inside, and be closed up C) left with the water at normal working level but opened up to atmosphere D) left with the water at normal working level and pressurized with air to 50 kPa E) filled completely with water and the vent left open to atmosphere

B) drained, thoroughly dried out, have desiccant placed inside, and be closed up

The disadvantage of a series loop hot water heating system is: A) the high cost of the piping system B) the high water consumption C) its low efficiency D) the individual convectors cannot be shut off E) the temperature of the system must be kept very high

D) the individual convectors cannot be shut off

``` How often would you test the low level fuel cutoff on a low pressure steam heating boiler by blowing out the float chamber? A) daily B) monthly C) semi-annually D) annually E) bi-weekly ```

A) daily

Large journal or sleeve bearings have grooves: A) in the high pressure area of the bearing Babbitt B) cut into the bearing housing C) for distributing lubricant evenly just after the pressure area D) in the non-pressure area E) cut in them for cooling purposes

D) in the non-pressure area

``` A pneumatic relay can also be called a/an: A) selector switch B) air reservoir C) bleed type controller D) cumulator E) pneumatic - electric switch ```

D) cumulator

``` Many typical steam plant auxiliaries are eliminated with a gas turbine due to its: A) small size B) high speed C) high power to weight ratio D) simplicity E) low oil consumption ```

D) simplicity

``` Electrical power can be determined by the formula: A) P = EI B) I = ER C) E = IR D) R = EI E) P = IR ```

A) P = EI

``` Low boy furnaces are just over _____ in height. A) 1.0 m B) 0.8 m C) 1.4 m D) 1.6 m E) 1.2 m ```

E) 1.2 m

``` A refractory burner disadvantage is: A) high cost due to complexity B) too much fuel preheat C) low radiant heat D) low combustion efficiency E) overheating of boiler metal ```

A) high cost due to complexity

Compression type packing: A) may be saturated with a lubricating material B) reduces the maintenance cost on the pump C) protects the shaft from scoring and corrosion D) is used with all mechanical seals E) should last the life of the pump

A) may be saturated with a lubricating material

Which of the following statements about adding oil to a system is true? A) oil is added by charging it into the crankcase B) because the crankcase is pressurized, it is not possible for air to get in the system when adding oil C) oil cannot be added while the compressor is in operation D) the system must be recharged, purged and re-pressurized after the oil has been added E) for most compressors, oil is simply added through the dipstick tube

A) oil is added by charging it into the crankcase

``` The cooking of wood chips in a pulp mill is done in a digester with: A) black liquor B) grey liquor C) green liquor D) sodium hydroxide E) white liquor ```

E) white liquor

Calculations of return air duct leakage include: A) 3% seepage if the return air duct is located outside the conditioned space B) 3% seepage if the return air duct is located both inside and outside the conditioned space C) 10% leakage if the return air duct is located inside the conditioned space D) 3% leakage if the return air duct is located inside or outside the conditioned space E) 5% seepage if the return air duct is located outside the conditioned space

A) 3% seepage if the return air duct is located outside the conditioned space

``` Wear rings are usually constructed of: A) ceramics or aluminum B) graphite or bronze C) bronze or cast iron D) steel or alloy steel E) Teflon ```

C) bronze or cast iron

Rippled finned surface type heating or cooling coils: A) are often used for low temperature application where ice may form B) decrease the heat transfer efficiency C) increase the heat transfer efficiency by creating more turbulence at fin surface D) have no effect on heat transfer efficiency E) are not used in air handling systems

C) increase the heat transfer efficiency by creating more turbulence at fin surface

_______ causes the fuel to ignite in a Diesel engine. A) a precisely timed glow plug B) the pressure of the injected fuel C) the high temperature compressed air in the engine cylinder D) the fuel injector nozzle E) a spark plug

C) the high temperature compressed air in the engine cylinder

``` The connection provided on DC motors to supply the armature with power: A) are slip rings B) are field poles C) is a rheostat D) is a commutator E) is hard wired ```

D) is a commutator

Air flow in a natural draft cooling tower is dependent upon the: A) speed of the cooling fan B) volume of water flowing C) partial pressure exerted above the surface of the sump D) differences in the temperature of the air leaving and entering the cooling tower E) wind direction

D) differences in the temperature of the air leaving and entering the cooling tower

``` The level I the condensate receiver may be automatically controlled by a: A) float switch B) pressure reducing valve C) gate valve D) draw valve E) sight glass ```

A) float switch

``` The intersection between the line running vertically from the point on the dry bulb scale and the diagonally running line which originates at the wet bulb scale is defined as the: A) dew point temperature B) partial pressure C) reference point D) specific volume E) relative humidity ```

C) reference point

``` The refrigeration condenser design that requires the tubes to be cleaned with acid and then neutralized, is the: A) shell and tube condenser B) shell and coil condenser C) air cooled condenser D) evaporative condensers E) baffle condensers ```

B) shell and coil condenser

``` A high flash point in oil reduces the risk of: A) pump cavitation B) condensation C) vapour bubble formation D) heat transfer E) fire ```

E) fire

The thermal element of a hot water boiler limit control: A) measures pressure B) senses temperature, and changes it to a corresponding pressure C) must use a capillary tube D) measures the heat content of the boiler water E) is not used when the boiler has a modulating firing rate control strategy

B) senses temperature, and changes it to a corresponding pressure

``` To regulate the flow of water to a zone circuit, a: A) flow control valve is used B) diverted fitting is used C) gate valve is used D) pressure reducing valve is used E) balancing valve is used ```

E) balancing valve is used

Which of the following statements about fan coil units combined with makeup air systems is false? A) the initial cost is relatively high B) they are used extensively in motels and hotels C) they have a minimum space requirement D) they provide heating, cooling, filtration, and air circulation E) they have a high degree of individual zone control

A) the initial cost is relatively high

``` The two general groups of fans are: A) positive displacement and dynamic B) high pressure and low pressure C) high volume and low volume D) positive displacement and axial flow E) centrifugal and axial flow ```

E) centrifugal and axial flow

Which of the following statements about manual refrigeration system purgers is false? A) gas being vented into the atmosphere must pass through a beaker filled with water B) the receiver and condenser should be purged separately C) purging rids the system of non condensable gases D) purgers cause considerable loss of lubricant E) they must be operated on a regular schedule

D) purgers cause considerable loss of lubricant

``` A variable air volume HVAC system requires static pressure control on the ______ air duct system. A) return B) supply C) ventilation D) exhaust E) recycled ```

B) supply

Brush gear for DC machines have brushes made from carbon because: A) carbon is a good insulator B) carbon doesn't heat up C) carbon reduces the friction and wear at the commutator D) carbon brushes are easy to manufacture E) they are inexpensive

C) carbon reduces the friction and wear at the commutator

``` Greases are a mixture of mineral oil and: A) carbon powder B) soap C) lard D) synthetic oils E) paraffin ```

B) soap

``` Some of the components of an automatic control loop are a sensing element, a transmitter, a _____ and a control valve. A) controller B) transformer C) transducer D) piping system E) converter ```

A) controller

A strand of fibre rope: A) is normally 20 meters in length B) will untwist if subjected to a heavy load C) is the smallest component of the rope D) is composed of yarns with a left hand twist E) is the most important part of the rope

D) is composed of yarns with a left hand twist

``` Which of the following instruments uses a battery operated fan to draw air over thermometer bulbs? A) hydrometer B) aspirating psychrometer C) sling psychrometer D) dry psychrometer E) humidistat ```

B) aspirating psychrometer

Proportional band, or throttling range, is the: A) control method in which the final control element moves proportionally to the deviation of the controlled variable from the set point B) control algorithm that combines the proportional and integral algorithms C) compensation action where a decrease in the compensation variable has the same effect as an increase in the controlled variable D) control point range through which the controlled variable must pass to drive the final control element through its full range E) sustained deviation between the control point and the set point of a proportional control system under stable operating conditions

D) control point range through which the controlled variable must pass to drive the final control element through its full range

``` On a gas fired automatic boiler, a normal programmed startup takes approximately: A) 105 seconds B) 35 seconds C) 27-40 seconds D) 120 seconds E) 70 seconds ```

A) 105 seconds

``` Three major losses which occur in a transformer are iron losses, copper losses, and: A) cooling losses B) heat losses C) flux leakage D) capacitive losses E) inductive losses ```

C) flux leakage

``` The property that determines whether a material will be easily magnetized or not is called: A) reaction B) conductivity C) fluctuation D) magnetism E) permeability ```

E) permeability

In comparing absorption and compression refrigerating systems, which of the following comparisons is true? A) slugs of liquid carried over from the evaporator do not damage the compression system but can ruin an absorption system B) absorption systems require less space than compression systems C) cooling water requirements are larger for an absorption system than for a compression system D) more equipment and piping are required for a compression system E) pumps in absorption systems require more electrical power

C) cooling water requirements are larger for an absorption system than for a compression system

When an automatic unattended boiler starts up, the program timer will first: A) energize the ignition transformer and pilot gas solenoid valve B) start the post purge period C) start the forced draft fan D) energize the main gas valve E) energize the main feedwater valve

C) start the forced draft fan

One of the advantages of a common exhaust duct system used for ventilation in a large building is: A) no fan to maintain B) the building can be maintained at a slight negative pressure at all times C) only one fan to maintain D) windows can be eliminated E) no power is required

C) only one fan to maintain

``` In order to lower the boiling point on the refrigerant in the lithium bromide refrigeration system, it is important that the system maintain: A) an extremely high vacuum B) very high pressure C) very low temperatures D) very fast refrigerant flow E) high absorbent circulation ```

A) an extremely high vacuum

``` The basic unit of mechanical or electrical power is the: A) volt B) watt C) ampere D) ohm E) Newton ```

B) watt

``` Some of the characteristics that make the gas turbine a better choice over other prime movers are: A) low power to weight ratio B) high thermal efficiency C) rapid startup and loading D) low fuel consumption E) low NOx emissions ```

C) rapid startup and loading

The vapour space of the surge tank in a hot oil system is: A) a separate compartment in the tank where gas is separated from the oil B) occupied by a cushion of air C) a place where gas is added to the oil D) the space in the tank above the level of the oil E) the space in the tank below the level of the oil

D) the space in the tank above the level of the oil

Moisture in a refrigeration system will not cause: A) the formation of ice inside the refrigeration system B) acid formation inside the refrigeration system C) corrosion inside the refrigeration system D) the deterioration of the motor insulation of a hermetic compressor E) excessive high side pressures

E) excessive high side pressures

``` Chemical pulping processes result in a _____ percent loss by weight of the raw forest material input. A) 25% B) 50% C) 75% D) 15% E) 10% ```

B) 50%

``` The ______ is a unitary air conditioning system that uses a direct expansion refrigeration system to provide cooling and dehumidification, serving a local area without using duct work. A) unit ventilator B) rooftop unit C) window air conditioner D) high velocity terminal reheat system E) multi zone system ```

C) window air conditioner

On a multiple steam boiler heating system, a stop valve must be placed at each boiler outlet to: A) permit slower system warm ups B) allow the boiler to be isolated from the system C) prevent steam from entering another boiler D) allow each boiler to supply only a part of the system E) permit different system pressures

B) allow the boiler to be isolated from the system

One of the first ways to detect a fault in a reciprocating steam engine is by: A) monitoring change in its sound B) observing temperature indication C) determining its performance efficiency D) monitoring its oil consumption E) monitoring changes in smell

A) monitoring change in its sound

Diesel engine governing is accomplished by: A) varying the load on the engine B) carburetion C) varying the fuel quantity delivered per power stroke D) modulating the volume of the atomizing air E) modulating the pressure of the atomizing air

C) varying the fuel quantity delivered per power stroke

A diesel hydrotreater in an oil refinery: A) removes sulphur and nitrogen compounds before the naphtha goes to the platformer B) causes the heavy hydrocarbons to be transformed into lighter hydrocarbons C) only removes water from the diesel fuel D) removes sulphur and nitrogen compounds from the diesel fuel before it goes to storage E) removes water from the crude oil

D) removes sulphur and nitrogen compounds from the diesel fuel before it goes to storage

``` The device used to maintain a constant pressure throughout a pneumatic control system is called a: A) reducing valve B) gradual switch C) pneumatic valve D) balancing valve E) proportional band controller ```

A) reducing valve

``` Low pressures and vacuums may be measured: A) with a transducer B) with a rotameter C) in MPa D) with a manometer E) in milli-newtons ```

D) with a manometer

A closed type expansion tank in a hot water heating system must: A) be full of water at all times B) have a vent open to atmosphere at all times C) be located three meters above the boiler D) be located no higher than the top of the boiler E) be partially filled with air at all times

E) be partially filled with air at all times

In order to protect the drive motor, a start-stop air compressor should be equipped with: A) variable speed control B) constant speed control C) safety heads D) a speed sensitive automatic cylinder unloader E) liquid cooling

D) a speed sensitive automatic cylinder unloader

``` People need considerable time to adjust when moving from one space to another, when temperature and humidity vary widely. This may be described as: A) shock effect B) change in comfort zone C) comfort condition D) effective temperature change E) air/motion effect ```

A) shock effect

``` Radiators and convectors should be placed: A) against inside walls B) close to the boiler C) in a central location D) away from windows E) against outside walls ```

E) against outside walls

``` The injection pump of a Diesel engine is driven by: A) piston action B) the governor C) the wrist pin D) the gudgeon pin E) a camshaft ```

E) a camshaft

While new refractory is drying in a hot oil heater, the oil in the tubes is: A) allowed to rise in temperature at not more than 55 degrees Celsius per hour B) allowed to drop in temperature at not more than 55 degrees Celsius per hour C) maintained in temperature D) drained from the system E) not circulated

A) allowed to rise in temperature at not more than 55 degrees Celsius per hour

``` The type of circuit used to store (write) and retrieve (read) information from a computer is known as its: A) bytes B) motherboard C) RAM D) CPU E) ROM ```

C) RAM

The purpose of the naphtha hydrotreater in an oil refinery is to: A) remove water from the naphtha B) remove sulphur and nitrogen compounds before the naphtha goes to the platformer C) to cause the heavy hydrocarbons to be transformed into lighter hydrocarbons D) to remove water from the crude oil E) to remove diesel fuel from the naphtha

B) remove sulphur and nitrogen compounds before the naphtha goes to the platformer

``` The utility's responsibility does not go beyond a customer's: A) first branch line B) first over current device C) primary transformer D) first trunk circuit E) motor control center ```

B) first over current device

``` In a vertical sectional boiler, the sections are placed: A) one above the other B) side by side C) on the furnace D) above the draft hood E) 180* to each other ```

B) side by side

A negative factor of hermetic type refrigeration compressors is: A) they are too large to be used in any application except large industrial plants B) the drive motor tends to overheat C) shaft sealing is difficult D) field servicing is not possible E) it is difficult to replace the shaft coupling

D) field servicing is not possible

If the packing gland of a centrifugal water pump is leaking too much, you should: A) tighten up the gland until all leakage has been stopped B) tighten up the gland but permit a slight amount of leakage C) tighten up the gland as far as is possible D) throttle the suction valve a little E) tighten up the gland until there is 10% leakage

B) tighten up the gland but permit a slight amount of leakage

The refrigerant liquid charging valve connection is: A) on the condenser B) on the compressor suction crossover valve C) on the liquid line after the liquid shutoff valve D) on the liquid receiver E) between the evaporator and the compressor inlet

C) on the liquid line after the liquid shutoff valve

The specific humidity scale on a psychrometric chart is along the: A) bottom horizontal axis B) right side vertical axis C) top horizontal axis at the top of the chart D) left saturation line E) left side vertical axis and left side

B) right side vertical axis

A non bleed controller bleeds control air: A) when the supply pressure is decreased B) when the supply pressure is increased C) non bleed controllers do not bleed air D) when the control air pressure is increased E) when the control air pressure is decreased

E) when the control air pressure is decreased

``` During warmup of scold hot water boiler, excessive pressure buildup is prevented by: A) warming the system slowly B) an expansion tank C) a pressure relief valve D) opening the boiler outlet valve E) venting the system ```

B) an expansion tank

Before starting a pump, check: A) that the packing is drip free B) that the area around the pump is cool and dry C) that the suction and discharge valves are in their proper positions D) that the lantern ring turns freely E) the bearing temperatures

C) that the suction and discharge valves are in their proper positions

The furnace refractory in a boiler should be _____ to prolong its life. A) wash coated with a dilute solution of heat resistant cement B) painted with heat resistant paint C) oiled D) wire brushed E) washed with a high pressure hose

A) wash coated with a dilute solution of heat resistant cement

The purpose of humidification is to: A) add moisture to the air during the cooling season B) add moisture to the air during the heating season C) remove moisture from the air during the heating season D) remove moisture from the air during the cooling season E) add moisture to the air during the cooling season

B) add moisture to the air during the heating season

``` To minimize fan vibration problems and premature fan belt wear, it is proper to use: A) direct drive fans B) balanced sheaves C) V-belt drives D) fluid drives E) outlet damper controls ```

B) balanced sheaves

``` Which of the following is a programming language? A) English B) word C) desktop publishing D) Latin E) pascal ```

E) pascal

``` Which of the following is not a physical property of refrigerants? A) toxicity B) odour C) leakage tendency D) corrosiveness E) miscibility ```

D) corrosiveness

``` A current carrying conductor being moved by a magnetic field is the principle known as: A) magnetic flux B) electrolysis C) hydro-electrics D) generator action E) motor action ```

E) motor action

In the evaporator of a refrigeration system: A) the refrigerant rejects heat to the cooling tower B) the refrigerant absorbs heat from the compressor cooling system C) the refrigerant absorbs heat from the surrounding medium D) the surrounding medium evaporates E) the refrigerant is condensed

C) the refrigerant absorbs heat from the surrounding medium

Centrifugal compressors: A) are used for high pressure and low flow B) could be of the multi-stage type C) must have intercoolers when multi-staged D) must have a safety valve on the discharge when steam driven E) require inlet and discharge valves

B) could be of the multi-stage type

Axial flow fans: A) have maximum horsepower requirements at maximum air delivery B) have minimum horsepower requirements at maximum air delivery C) are the logical choice to move large volumes of air at high static pressures D) are the least economical choice when large volumes of air must be moved at low pressures E) are quieter than centrifugal fans

B) have minimum horsepower requirements at maximum air delivery

An operating control switch for an on-off boiler: A) uses a differential spring to reduce cycling B) can only have its cut in setting adjusted C) has an un-adjustable span between cut in and cut out D) utilizes a resistance coil E) operates in conjunction with a modutrol motor

A) uses a differential spring to reduce cycling

``` Using a compressed air starting motor is a popular method of starting: A) a large stationary Diesel engine B) small two stroke engine C) gasoline engine D) an aircraft engine E) a propane engine ```

A) a large stationary Diesel engine

Which of the following statements about cooling and dehumidification is false? A) air washers are used to dehumidify air B) when air leaves the washer, it will be close to 109% relative humidity C) the spray water carries away the latent heat of evaporation of the water vapour in the air D) dry bulb temperatures are increased E) dew point temperatures are lowered

D) dry bulb temperatures are increased

``` When fan belts show signs of fraying, cracking, and wear, they should be: A) repaired B) replaced C) reported D) re-tightened E) realigned ```

B) replaced

Proper priming and venting of a pump is important, especially if: A) the medium being pumped is high temperature B) the medium being pumped contains suspended solids C) oil or other low flash point lubricant is being pumped D) a mechanical seal is used E) the pump has a stuffing box and lantern ring

D) a mechanical seal is used

``` The _____ of a DC machine is built up of laminated steel plates mounted on a shaft. The coils agree connected to a commutator mounted on one end of the rotor shaft. A) armature B) yoke C) core D) stator E) rheostat ```

A) armature

Which of the following steps is not part of the startup procedure of a centrifugal compressor refrigerating system? A) operate the oil pump for at least ten minutes before starting the compressor B) open the stop valves in the chilled water system C) open the main circuit breakers D) open the makeup water valves E) check the refrigerant levels

C) open the main circuit breakers

``` The amount of pre-mix air to an atmospheric burner is typically: A) 10%-12% B) 5%-8% C) 20%-50% D) 30%-40% E) 100% ```

D) 30%-40%

When a boiler equipped with a combination feedwater control and low water cutoff device shuts down due to a low water condition: A) the feedwater flow will also stop B) the level must be restored to above the cutoff line before the unit can be restarted C) it can be restarted by pressing the manual reset D) the operator must open the feeder valves to allow water into the boiler E) the condensate pump must be restarted

B) the level must be restored to above the cutoff line before the unit can be restarted

Connecting rods on a steam engine: A) convert reciprocating motion to rotary motion B) are used to move the slide valve C) are only needed on vertical engines D) are used to connect the piston to the slide valve E) connects the inlet valve to the discharge valve

A) convert reciprocating motion to rotary motion

An electric boiler feedwater valve will: A) eliminate the need for a second low water fuel cutoff B) prevent low water conditions C) open before the low water cutoff operates D) require manual action to open E) open if the boiler trips due to low water

C) open before the low water cutoff operates

``` When using compressed air to start a Diesel engine, the pressure is approximately: A) 520 kPa B) 255 kPa C) 3030 kPa D) 2100 kPa E) 435 kPa ```

D) 2100 kPa

The purpose of stabilization in natural gas treatment plants is to: A) stabilize the gas from the contactor B) flash off the gases at low pressure from the liquid hydrocarbons C) stabilize the liquid and gas in the inlet separator D) flash off the gases at high pressure from the liquids E) dehydrate the condensate

B) flash off the gases at low pressure from the liquid hydrocarbons

Fin spacing of 1.814 to 6.35 mm is most normally used for: A) direct expansion coils for low temperature applications B) steam and hot water heating coils C) chilled water cooling coils D) cooling refrigerant coils E) refrigerant condenser coils

B) steam and hot water heating coils

Automatic snow melting systems do not use: A) hot water and antifreeze mixtures B) electric resistance heating C) infrared lamps mounted above sidewalks and ramps D) hot water and ethylene glycol mixed E) forced air heat

E) forced air heat

Compressor unloaders: A) could close the discharge valve B) must be used on centrifugal compressors C) could keep the suction valve open D) activate the stop and start button E) are located on the driver of the compressor

C) could keep the suction valve open

``` Which extinguishing agents are most suitable for hot oil fires? A) water only B) foam and dry chemical C) carbon dioxide gas D) carbon tetrachloride E) halon ```

B) foam and dry chemical

``` To prevent the possibility of a furnace explosion, it is important that the furnace is ______ before the igniter is energized and fuel is supplied to the burner nozzle(s). A) pre-heated B) post-heated C) purged D) cooled E) pressurized ```

C) purged

``` A type of anti-friction bearing is the _____. A) bushing B) kingsbury C) ball bearing D) sleeve bearing E) journal bearing ```

C) ball bearing

``` Many typical steam plant auxiliaries are eliminated with a gas turbine due to its: A) small size B) high speed C) high power to weight ratio D) simplicity E) low oil consumption ```

D) simplicity

``` Electrical power can be determined by the formula: A) P = EI B) I = ER C) E = IR D) R = EI E) P = IR ```

A) P = EI

``` Low boy furnaces are just over _____ in height. A) 1.0 m B) 0.8 m C) 1.4 m D) 1.6 m E) 1.2 m ```

E) 1.2 m

``` A refractory burner disadvantage is: A) high cost due to complexity B) too much fuel preheat C) low radiant heat D) low combustion efficiency E) overheating of boiler metal ```

A) high cost due to complexity

A) may be saturated with a lubricating material

``` Many typical steam plant auxiliaries are eliminated with a gas turbine due to its: A) small size B) high speed C) high power to weight ratio D) simplicity E) low oil consumption ```

D) simplicity

``` Electrical power can be determined by the formula: A) P = EI B) I = ER C) E = IR D) R = EI E) P = IR ```

A) P = EI

``` Low boy furnaces are just over _____ in height. A) 1.0 m B) 0.8 m C) 1.4 m D) 1.6 m E) 1.2 m ```

E) 1.2 m

``` A refractory burner disadvantage is: A) high cost due to complexity B) too much fuel preheat C) low radiant heat D) low combustion efficiency E) overheating of boiler metal ```

A) high cost due to complexity

A) may be saturated with a lubricating material

``` Many typical steam plant auxiliaries are eliminated with a gas turbine due to its: A) small size B) high speed C) high power to weight ratio D) simplicity E) low oil consumption ```

D) simplicity

``` Electrical power can be determined by the formula: A) P = EI B) I = ER C) E = IR D) R = EI E) P = IR ```

A) P = EI

``` Low boy furnaces are just over _____ in height. A) 1.0 m B) 0.8 m C) 1.4 m D) 1.6 m E) 1.2 m ```

E) 1.2 m

``` A refractory burner disadvantage is: A) high cost due to complexity B) too much fuel preheat C) low radiant heat D) low combustion efficiency E) overheating of boiler metal ```

A) high cost due to complexity

A) may be saturated with a lubricating material

``` Many typical steam plant auxiliaries are eliminated with a gas turbine due to its: A) small size B) high speed C) high power to weight ratio D) simplicity E) low oil consumption ```

D) simplicity

``` Electrical power can be determined by the formula: A) P = EI B) I = ER C) E = IR D) R = EI E) P = IR ```

A) P = EI

``` Low boy furnaces are just over _____ in height. A) 1.0 m B) 0.8 m C) 1.4 m D) 1.6 m E) 1.2 m ```

E) 1.2 m

``` A refractory burner disadvantage is: A) high cost due to complexity B) too much fuel preheat C) low radiant heat D) low combustion efficiency E) overheating of boiler metal ```

A) high cost due to complexity

A) may be saturated with a lubricating material

``` Many typical steam plant auxiliaries are eliminated with a gas turbine due to its: A) small size B) high speed C) high power to weight ratio D) simplicity E) low oil consumption ```

D) simplicity

``` Electrical power can be determined by the formula: A) P = EI B) I = ER C) E = IR D) R = EI E) P = IR ```

A) P = EI

``` Low boy furnaces are just over _____ in height. A) 1.0 m B) 0.8 m C) 1.4 m D) 1.6 m E) 1.2 m ```

E) 1.2 m

``` A refractory burner disadvantage is: A) high cost due to complexity B) too much fuel preheat C) low radiant heat D) low combustion efficiency E) overheating of boiler metal ```

A) high cost due to complexity

A) may be saturated with a lubricating material

``` Many typical steam plant auxiliaries are eliminated with a gas turbine due to its: A) small size B) high speed C) high power to weight ratio D) simplicity E) low oil consumption ```

D) simplicity

``` Electrical power can be determined by the formula: A) P = EI B) I = ER C) E = IR D) R = EI E) P = IR ```

A) P = EI

``` Low boy furnaces are just over _____ in height. A) 1.0 m B) 0.8 m C) 1.4 m D) 1.6 m E) 1.2 m ```

E) 1.2 m

``` A refractory burner disadvantage is: A) high cost due to complexity B) too much fuel preheat C) low radiant heat D) low combustion efficiency E) overheating of boiler metal ```

A) high cost due to complexity

A) may be saturated with a lubricating material

In a series wound DC generator: A) brushes change DC to AC for the armature B) the shunt winding is connected taps in before the series winding C) load current passes through the field windings D) the shunt winding is connected after the series winding E) there are no field poles

C) load current passes through the field windings

D) the individual convectors cannot be shut off

A closed cycle gas turbine: A) does not need a combustion chamber B) must use a cooler before the regenerator C) will use the same working fluid over again D) is a self-starting type of turbine E) starts with the exhaust valve closed

C) will use the same working fluid over again

``` Natural draft cooling towers operate most effectively in large open spaces and: A) where wind is relatively constant B) where relative humidity is high C) where a large body of water is nearby D) require a windbreak E) must not be in direct sunlight ```

A) where wind is relatively constant

``` Actual ventilation rates may vary per person from: A) 0.5 m3/sec to 0.6 m3/sec B) 0.5 m3/min to 0.75 m3/min C) 0.2 m3/m to 1.2 m3/min D) 0.14 m3/min to 1.5 m3/min E) 1.0 m3/hour to 1.5 m3/hour ```

D) 0.14 m3/min to 1.5 m3/min

Manual or hand operated expansion valves are seldom used in modern refrigeration systems except, occasionally: A) to control the temperature of the evaporator B) in the bypass line around the automatic control valve C) to control the temperature of the cooling medium D) in the compressor oil cooling system E) to control the temperature in the condenser

B) in the bypass line around the automatic control valve

Proper performance of hot water heating and cooling coils does not depend upon: A) adequate air velocity over the finned surface B) counter flow arrangement of air and water C) air venting from the system and the coil D) tube circulating and fins E) continuous removal of condensate

E) continuous removal of condensate

When an atmospheric gas fired burner is burning fuel properly: A) it will have a blue, non-luminous flame B) the furnace will pulsate C) there will be no turbulence D) it will have a long bright yellow flame E) it will have perfect combustion

A) it will have a blue, non-luminous flame

``` An ammeter must _____ to the electrical circuit. A) offer low resistance B) offer no resistance C) offer a slight resistance D) offer a high resistance E) apply a voltage ```

A) offer low resistance

A common complaint against the fan coil unit with makeup air is: A) the response is very slow when first turned on B) the unit must be shutoff when the room is unoccupied C) the fan noise is excessive D) the fan stirs up a great deal of dust E) the unit requires too much maintenance

C) the fan noise is excessive

``` With regard to the high pressure side, the maximum setting for a pressure limiting device on a refrigeration system shall not exceed the pressure relief device set point by: A) 100% B) 75% C) 90% D) 80% E) 50% ```

C) 90%

``` Wear rings in centrifugal pumps: A) are non-replaceable B) are installed on impellers C) protect the shaft from wear D) compensate for misalignment of the impeller E) are only found on high pressure pumps ```

B) are installed on impellers

``` When air is forced through a heating unit that contains both the fan and coil, the unit is called: A) a unit heater B) an injector C) an induction unit D) a unit ventilator E) a convector ```

A) a unit heater

``` To which of the following oil burners is the oil supplied under high pressure? A) mechanical atomizing burner B) air atomizing burner C) rotary cup burner D) steam atomizing burner E) multi-spud burner ```

A) mechanical atomizing burner

``` Group "A" refrigerants are: A) non-flammable B) low-flammable C) low-toxic D) low-toxic and flammable E) high-toxic and flammable ```

C) low-toxic

Which of the following is not a problem associated with excessive head pressure in a refrigeration plant? A) increased power consumption B) decreased condenser capacity C) reduced compressor capacity D) over stressed compressor parts E) pressure compressor lube-oil breakdown

B) decreased condenser capacity

``` In a pulse combination furnace, the stated efficiency is: A) 94-98% B) 80-95% C) 70-75% D) 60-70% E) 50-60% ```

A) 94-98%

A gas turbine: A) expands hot gases through the compressor B) output increases when using air of maximum density C) operates the best when inlet air is hot D) output increases at higher altitude E) output increases when equipped with an air preheater

B) output increases when using air of maximum density

``` One tonne of refrigeration is: A) 13958 kJ per day B) 1000 kg of mass C) 233 kJ per minute D) 13958 J per hour E) 12000 BTU per hour ```

C) 233 kJ per minute

A) the shape of the steam passages between adjacent blades

Diverted fittings are used in the supply lines to heating units when: A) compensating for a low heating load B) a higher heating output is required from the heating unit C) the distance from boiler to heating unit is short D) there are no balancing valves installed in the supply line E) they cannot be easily installed in the return lines

B) a higher heating output is required from the heating unit

``` The mixing box of an HVAC system uses a _____ damper. A) manual B) modulating C) two-position D) relief E) face ```

B) modulating

A high gas pressure fuel cutoff switch: A) closes when gas pressure is too high B) automatically resets itself when the gas pressure is restored C) is located upstream of the automatic fuel valve D) is a normally open switch E) prevents excessive fuel pressure from creating an unstable flame condition

E) prevents excessive fuel pressure from creating an unstable flame condition

``` A120/208 V system is best described as a: A) three phase four wire system B) single phase one wire system C) three phase three wire system D) one phase four wire system E) two phase three wire system ```

A) three phase four wire system

In steam coils with long tube lengths and heating large amounts of low temperature outside air, freezing problems are minimized by using: A) preheat coils controlled by an outdoor temperature controller B) modulating control valve to control the steam heating coil output C) a two position control valve to control coil output D) an oversized coil E) an oversized control valve

A) preheat coils controlled by an outdoor temperature controller

``` A direct expansion type evaporator that has more than one refrigerant circuit requires ______ to provide even refrigerant flow in each circuit. A) a stop valve B) an expansion valve C) a distributor D) a purge valve E) a thermal regulator ```

C) a distributor

``` What is the name of the refrigerant that had the following characteristics? It is nonflammable, odourless, nontoxic, it does not have a corrosive effect on metal if water is present and at atmospheric pressure it had a boiling point of approximately -40.6*C. A) ammonia B) R-22 C) R744-R D) R-134a E) R-290 ```

B) R-22

``` The contaminants in natural gas may include: A) hydrogen sulphide B) pentane C) hexane D) methane E) oxygen ```

A) hydrogen sulphide

``` In a gravity return system, the boiler should be placed: A) well above the highest radiator B) well below the lowest radiator C) on an elevated platform D) at the same level as the radiators E) in a central location ```

B) well below the lowest radiator

``` A float operated low water fuel cutoff has its switch separated from the boiler pressure by: A) a float cage B) a seal cage C) a flexible diaphragm D) a siphon E) packing ```

C) a flexible diaphragm

The purpose of a flow switch installed in a hot water supply line to an air handling unit is to: A) stop the fan and close the outside air dampers if the low limit temperature controller malfunctions or the heat source fails B) open the outside air dampers wide when the water flow is established C) open the hot water supply valve further if the hot water flow drops below a safe limit D) close the outside air dampers and stop the fan if the flow of water is interrupted, to protect the coil from freezing E) alert the operator of a low flow condition

D) close the outside air dampers and stop the fan if the flow of water is interrupted, to protect the coil from freezing

``` How many blow off valves does a steam heating boiler require? A) none B) one C) two D) three E) four ```

B) one

``` The disadvantage of a natural air intake, mechanical exhaust ventilation system is the intake air: A) tends to draw in exhausted air B) volume is too large C) volume is too low D) is neither filtered nor heated E) has too much moisture ```

D) is neither filtered nor heated

``` The value of the current flow in an electric circuit, where the voltage is 12 V and the resistance is 3 ohms is: A) 4 W B) 36 A C) 0.25 A D) 4 A E) 3.6 A ```

D) 4 A

The recommended inspection procedures for a power boiler are outlined in the: A) CSA B51 Boiler, Pressure Vessel and Pressure Piping Code B) ANSI B31.1 Power Piping Code C) ASME Boiler and Pressure Vessel Code, Section I D) ASME Boiler and Pressure Vessel Code, Section IV E) ASME Boiler and Pressure Vessel Code, Section VII

E) ASME Boiler and Pressure Vessel Code, Section VII

The feedwater pipe before entering the boiler must contain: A) a check valve with a stop valve between the check valve and the boiler B) a check valve between the stop valve and the boiler C) a stop valve only D) two stop valves E) a quick and slow opening stop valve

A) a check valve with a stop valve between the check valve and the boiler

``` The most important rule in safe operation of steam boilers is to: A) watch the steam pressure B) not overheat the boiler C) ensure an adequate air supply D) ensure a fuel supply E) keep the correct water level ```

E) keep the correct water level

``` When the steam pressure drop occurs only in the stationary steam passages, the turbine is known as: A) a single stage unit B) an impulse unit C) a reaction unit D) a parsons unit E) a simple turbine ```

B) an impulse unit

``` A ______ saw consists of as many as 40 parallel saws arranged in a movable sash mounted in a heavy steel frame. A) chain B) band C) gang D) hand E) deck ```

C) gang

``` Alternators are constructed to use slip rings made of brass or: A) copper B) carbon C) mica D) silicon E) steel ```

E) steel

E) an oil separator

With regard to air conditioning, an induction system gets its name from: A) the way air in the room is mixed with the supply air B) the type of fan coils used C) the type of air handling unit used D) the air used in the central element of the system E) the volume of air conditioned

A) the way air in the room is mixed with the supply air

``` During the winter, the majority of people feel comfortable when the effective temperature is approximately: A) 15 and 19*C B) 21 and 24*C C) 19 and 24*C D) 17 and 22*C E) 16 and 20*C ```

D) 17 and 22*C

``` In an automatic control system, the controller output signal changes the position of the: A) recorder B) transmitter C) sensing element D) control valve E) indicator dial ```

D) control valve

``` A common us for a DC generator is: A) power supply for an elevator B) an automobile alternator C) emergency power D) power factor correction E) computer room power supply ```

A) power supply for an elevator

A gas sweetening unit in an oil refinery uses: A) heat to drive off the hydrogen sulphide from the sour gas B) an amine solution to absorb the hydrogen sulphide from the sour gas C) an amine solution to absorb the hydrogen sulphide from the crude oil D) amine solution to absorb the hydrogen sulphide from the gasoline E) heat to drive off the hydrogen sulphide from the crude oil

B) an amine solution to absorb the hydrogen sulphide from the sour gas

In a refrigeration system, a weighted valve pin is used in a high pressure float valve system in order to: A) get proper pressure drop into the evaporator B) reduce frosting of the line immediately after the float valve C) allow the room temperature to be adjusted D) act as a pressure relief device E) prevent flooding of the evaporator

B) reduce frosting of the line immediately after the float valve

``` A typical extra low voltage device would be a: A) toaster B) fluorescent light C) door bell D) step down transformer E) television set ```

C) door bell

``` Natural ropes are made of: A) nylon B) polyethylene C) Manila D) Dacron E) polyvinyl chloride ```

C) Manila

B) this system is primarily used in larger buildings

Modulating combustion controls: A) regulate the steam and feedwater supply B) regulate the fuel and air supplies C) modulate only the fuel flow, because air flow is kept at maximum throughout the firing range D) are found only on the smallest of buildings E) operate at either high or low fire

B) regulate the fuel and air supplies

``` What type of boiler would you expect to find in a hot water system incorporating a converter? A) hot water boiler B) steam boiler C) forced circulation boiler D) single pass fire tube E) once through boiler ```

B) steam boiler

``` Convection type hot oil heaters have an approximate efficiency of: A) 25-35% B) 90-95% C) 85-95% D) 70-80% E) 75-85% ```

E) 75-85%

The purpose of dehydration in natural gas treatment plants is to: A) remove water vapour and remaining hydrocarbon condensate from the main gas stream B) lower the temperature of the hot condensate C) remove hydrogen sulphide from the hydrocarbons D) remove the liquid hydrocarbons from the gas E) separate the carbon dioxide in the inlet separator

A) remove water vapour and remaining hydrocarbon condensate from the main gas stream

``` Which of the following properties cannot be found on the psychrometric chart? A) the dew point temperature B) the partial pressure C) the specific humidity D) the enthalpy E) the relative humidity ```

B) the partial pressure

``` Vapour bubbles in a pump can cause the pump to: A) deteriorate B) rotate C) stall D) lose power E) cavitate ```

E) cavitate

``` An electronic filter is also known as: A) an ionic filter B) a HEPA filter C) a static filter D) an air purifier E) an electrostatic filter ```

E) an electrostatic filter

The most reliable method of testing a low water fuel cutoff is to: A) blow the low water cutoff down through the water column until the burner cuts out B) blow the float chamber down to see if the burner will cut out C) lower the water in the boiler to the level where the burner should cut out D) blow down the sight glass to see if the burner goes out E) manually trip the Mercury switches to shut off the boiler

C) lower the water in the boiler to the level where the burner should cut out

A float operated mechanical feeder valve in a secondary feedwater supply should: A) be a normally closed valve B) open just after the low water cutoff switch opens C) be located above the water column D) not open until the level is well below the feed pump cut in level E) not be deemed a standby device

D) not open until the level is well below the feed pump cut in level

``` The amount of heat absorbed by water when it evaporates at atmospheric pressure is: A) 99.63 kJ/kg B) 335 kJ/kg C) 417.46 kJ/kg D) 2257 kJ/kg E) 2675.5 kJ/kg ```

D) 2257 kJ/kg

``` Apparent power is the: A) kW of power consumed B) generated by DC generators C) VA supplied to the circuit D) power due to resistance in a circuit E) power recorded by a kWh meter ```

C) VA supplied to the circuit

If your low pressure steam boiler was in service and you found that there was no water level showing in the gauge glass, your first action would be to: A) lift the safety valve try lever B) cut off the fuel and air to the furnace C) start the standby feed pump D) send for the boiler inspector E) call a reliable plumber

B) cut off the fuel and air to the furnace

Modular cast iron boiler water flow is: A) continuous through all modules B) connected in series C) intermittent, occurring only while the unit is firing D) always vertically upwards E) done without the use of headers or manifolds

A) continuous through all modules

The static pressure measured in an air duct is measured by connecting a: A) manometer to the side of an air duct B) bourdon tube to the air duct C) pressure gauge to the side of a duct, with a sensing tube extending inside of the duct directed toward the airflow D) manometer to the side of a duct, with a sensing tube extending inside of the duct directed toward the airflow E) manometer to the fan

A) manometer to the side of an air duct

One of the advantages of gas fired infrared heating over other types of heating systems is: A) it can heat a large volume enclosure with little fuel B) it requires no fuel handling equipment C) it eliminates the need for ventilation D) it can provide effective spot heating E) it can be used efficiently as the main heating source for a large building

D) it can provide effective spot heating

A two shaft gas turbine: A) has the load turbine downstream from the compressor turbine B) uses the first turbine to drive the propeller of a turboprop engine C) is always an open cycle D) is always a closed cycle E) does not require a starting motor

A) has the load turbine downstream from the compressor turbine

``` The principle cause of steel corrosion in cooling towers is: A) dissolved carbon dioxide B) high pH C) dissolved oxygen D) low pH E) dissolved hydrogen ```

C) dissolved oxygen

``` Which of the following is not a pilot for a gas burner? A) continuous B) intermittent C) manual D) interrupted E) standing ```

C) manual

``` Permanent magnets are used for: A) wound rotor induction motors B) shunt motors C) series motors D) small portable alternators and generators E) induction motors ```

D) small portable alternators and generators

Which statement about compartmental variable air volume HVAC systems is false? A) smaller air handling units are located on each floor replacing a larger central unit B) each air handling unit is installed in a mechanical room for noise reduction, safety and appearance C) each air handling unit has its own filter, cooling coil and supply air fan D) each compartmental unit supplies from 15-100% outside air for ventilation and cooling E) a central air handling unit provides humidified air at 12.5*C for ventilation to each floor

D) each compartmental unit supplies from 15-100% outside air for ventilation and cooling

A) allow the interconnection of two power sources without placing them in parallel

``` Insufficient heat throughout a building is likely caused by: A) too much ventilation B) insufficient heat input C) poorly insulated ducting D) a missing filter E) an unbalanced system ```

B) insufficient heat input

``` Air in a hot water heating system is directed to: A) relief valve B) boiler C) radiator vents D) expansion tank E) atmosphere ```

D) expansion tank

Centrifugal pumps do not develop good suction lift because: A) atmospheric pressure is usually too low B) the pumped medium relative density is too high C) their integral component clearances are too high D) the speed is too low E) they favor pressure rather than volume

C) their integral component clearances are too high

``` Flange faces used in hot oil system construction should be: A) grooved and recessed B) smooth and raised C) grooved and raised D) tongue and groove E) threaded ```

B) smooth and raised

The Hartford loop will: A) only be installed on multiple boiler systems B) ensure continuous circulation of a hot water system C) prevent steam from entering a steam pressure gauge D) prevent boiler water level from going below the lowest safe water level E) replace the feedwater check valve

D) prevent boiler water level from going below the lowest safe water level

``` Electrical starters and contractors should be inspected: A) daily B) weekly C) monthly D) semi annually E) annually ```

E) annually

In a refrigeration system. Which of the following is not a cause of poor condenser performance? A) waterside scale accumulation B) oil film accumulation of the inside of the condenser C) accumulation of non-condensable gases in the condenser D) inadequate coolant circulation E) inadequate refrigerant charge

E) inadequate refrigerant charge

A hot water boiler low water fuel cutoff: A) should be tested weekly during routine boiler operation B) cannot be tested during routine boiler operation C) cannot be tested D) must be located at the lowest permissible water level E) must have a normally closed switch

B) cannot be tested during routine boiler operation

The types of humidifiers used for residential purposes are: A) air washers, wetted element, and atomizing B) pan, atomizing, and air washers C) pan, hot water, and air washers D) atomizing, wetted element, and pan E) pan, steam, and atomizing

D) atomizing, wetted element, and pan

``` The component of wood that is leached away reducing the ability of the wood to resist decay is the: A) bark B) creosote C) lignin D) cellulose E) natural extractives ```

E) natural extractives

``` In a central air conditioning system, supplementary units are located in each zone to provide additional: A) ventilation B) humidity control C) air circulation D) heating E) filtering ```

D) heating

Steam turbine governors: A) prevent the turbine from over speeding B) regulate the speed of the turbine automatically C) should be checked annually by the boiler inspector D) are driven by the generator shaft E) are not required for reaction turbines

B) regulate the speed of the turbine automatically

``` The inlet of a hot oil pump is located: A) above the surge tank B) at a convenient location C) inside the surge tank D) below the surge tank E) inside the boiler room ```

D) below the surge tank

``` Hot oil hearts should be inspected: A) every six months B) annually C) every two years D) whenever it is thought necessary E) according to the CSA code ```

B) annually

The chilled water flow switch prevents the: A) cooling tower fan from starting if chilled water flow has not been established B) cooling tower fan from starting if cooling water flow has not been established C) refrigeration compressor from starting if chilled water flow has not been established D) refrigeration compressor from starting if cooling water flow has not been established E) refrigeration compressor from starting if cooling tower fan has not been started

C) refrigeration compressor from starting if chilled water flow has not been established

``` A measure of comfort that involves the combined effects of the dry bulb temperature, relative humidity and air movement is defined as: A) comfort zone B) effective temperature C) comfort condition D) shock effect E) psychrometric climate ```

B) effective temperature

The safety head of a refrigeration compressor is designed to: A) unload overloaded cylinders B) be installed on a hermetic compressor C) relieve pressure due to liquid in the cylinder D) prevent explosion damage E) operate in place of a safety relief valve

C) relieve pressure due to liquid in the cylinder

``` The initial refrigerant charge is added to: A) the high pressure side of the system B) at the suction of the compressor C) the evaporator D) the expansion valve E) the heat exchanger ```

A) the high pressure side of the system

A steam engine piston: A) moves fastest at the end of its stroke B) produces the most force at the end of its stroke C) is lubricated with crankcase oil by the splash method D) moves fastest at the midpoint of its stroke E) needs no lubrication

D) moves fastest at the midpoint of its stroke

An automatic fill valve for a hot water boiler: A) will maintain maximum system pressure at all times B) operates to maintain a constant boiler water level C) is not mandatory D) operates to maintain a constant expansion tank level E) can be used with an open tank system

C) is not mandatory

To prevent freezing of the steam coil when steam pressure at the coil inlet is too low or lost is: A) a second preheat coil is installed at the outside air inlet B) a modulating steam control valve is installed at the coil inlet C) a two position steam control valve is installed at the coil inlet D) provisions are made to stop the fan and close the outside air dampers E) inverted bucket steam traps must be used

D) provisions are made to stop the fan and close the outside air dampers

In an oil refinery, it is important to: A) maximize production of the high demand products such as gasoline B) maximize production of the high demand products such as asphalt C) ensure that each refinery is nearly identical to others D) generate enough electricity so the entire plant is self sufficient E) regulate production quantities to achieve the highest market value for the final product

A) maximize production of the high demand products such as gasoline

The outdoor air inlet damper of an HVAC air handling unit may be split into two parts to provide: A) extra outside air when extra ventilation is required B) a means of controlling building static pressure C) minimum outside air during periods when maximum air is being exhausted D) maximum outside air during periods when minimum air is being exhausted E) minimum outside air required for ventilation, during times of maximum returning recirculation

E) minimum outside air required for ventilation, during times of maximum returning recirculation

``` Short radius elbows should be provided with: A) stiffeners B) turning vanes C) miter elbows D) noise attenuators E) flexible connections ```

B) turning vanes

Steam coils with a short tube length of 1.1 m or less, in comparison to steam coils with long tube lengths: A) are more likely to freeze, even if the steam trap is properly chosen B) are less likely to freeze regardless of steam trap choice and coil operation C) must use two position steam valves to prevent freeze up D) are less likely to freeze if the steam trap is properly chosen and the coil is properly piped E) will only freeze if the inlet air temperature drops to below -35 degrees Celsius

D) are less likely to freeze if the steam trap is properly chosen and the coil is properly piped

Manual or hand operated expansion valves are seldom used in modern refrigeration systems except, occasionally: A) to control the temperature in the evaporator B) in the bypass line around the automatic control valve C) to control the temperature of the cooling medium D) in the compressor cooling system E) to control the temperature of the condenser

B) in the bypass line around the automatic control valve

A refrigeration system contains 30 kg of an A1 refrigerant. Which of the following system locations does not require a stop valve, according to CSA B52 code? A) suction inlet of each compressor B) discharge outlet of each compressor C) suction inlet of each condensing unit D) discharge outlet of each condensing unit E) suction inlet of each liquid receiver

E) suction inlet of each liquid receiver

``` When Teflon is used as part of the mechanical seal, the maximum temperature of oil that can be pumped by a hot oil pump is: A) 100*C B) 250*C C) 350*C D) 150*C E) 200*C ```

E) 200*C

``` Of the following refrigeration system evaporators, the _____ evaporators require the greatest refrigerant charge. A) direct expansion B) bare tube C) plate surface D) flooded E) finned tube ```

D) flooded

Two fan wheels are rotating at the same speed. One wheel has forward curved blades and the other has backward inclined blades. The velocity of the air leaving the forward curved blades is considerably higher because: A) the centrifugal force of the forward curved blades is higher B) the linear velocity of the forward curved blades is higher C) the air resistance of the backward inclined blades is much lower D) the velocity of the air leaving the fan blades, added to the linear velocity of the fan blades, is greater with the forward inclined fan blades than the backward inclined fan blades E) fans with forward curved blades must be constructed with larger diameter wheels to provide the same airflow as a fan with backward inclined blades

D) the velocity of the air leaving the fan blades, added to the linear velocity of the fan blades, is greater with the forward inclined fan blades than the backward inclined fan blades