Misc. Questions Flashcards
When the boiler water has cooled to about _____ open the blowdown valves and drain the boiler. Select one:
A. 99°C (210°F)
B. 90°C (194°F)
C. 110°C (230°F)
D. 134°C (273°F)
E. 60°C (140°F)
B. 90°C (194°F)
The major components of a typical hot oil system include the furnace, pump, control devices and the: Select one:
A. Relief valve
B. Gas blanket
C. Stack damper
D. Containment dyke
E. Surge tank
E. Surge tank
On a hot water heating system the stop/balance check valve is also known as a _____ valve. Select one:
A. Triple duty
B. Pressure balancing
C. Double duty
D. Temperature control
E. Non-return
A. Triple duty
The “popping” pressure of a safety valve may be increased by: Select one:
A. Decreasing the spring pressure
B. Increasing the spring pressure
C. Lowering the adjusting ring
D. Raising the lifting lever
E. Raising the adjusting ring
B. Increasing the spring pressure
The infrared scanner is mounted on the end of a sighting tube in such a way that its temperature will not exceed: Select one:
A. 50°C (98°F)
B. 100°C (212°F)
C. 75°C (167°F)
D. 120°C (248°F)
E. 150°C (302°F)
B. 100°C (212°F)
The high gas pressure cut-off switch can be tested by: Select one:
A. Slowly raising the boiler pressure above the operating setpoint
B. Closing the main gas valve quickly
C. Slowly closing the main gas valve
D. Slowly covering the air supply to the fan
E. Quickly closing the main burner shut-off valve
E. Quickly closing the main burner shut-off valve
Clean steam may be used in: Select one:
A. Oil Refineries
B. Humidification systems
C. Gas plants
D. Chemical processes
E. Steam cleaning
B. Humidification systems
The blowdown tank is/does: Select one:
a. Does not allow the pressure to be reduced
b. Does not empty into the sewer
c. Not cool the water
d. Is not required on a low pressure boiler
d. Is not required on a low pressure boiler
Controls found on heating boilers include:
1. Operating controls
2. Pressure relief controls
3. High limit cut-off switches
4. Condensate level controls
5. Low limit cut-off switches
Select one:
A. 3, 4, 5
B. 1, 2, 3
C. 2, 3, 4
D. 3, 4, 5
E. 1, 3, 5
E. 1, 3, 5
The air present in steam lines and equipment must also be removed to prevent: Select one:
A. Corrosion from carbon dioxide
B. Corrosion from oxygen
C. Rusting from carbon dioxide
D. Pitting from carbon dioxide
E. Caustic embrittlement
A. Corrosion from carbon dioxide
In the one-pipe hot water heating system, the heating units are: Select one:
A. All supplied with water at the same temperature and the return from each convector flows the long way around to return to the boiler
B. Supplied from the main and the return from each convector is connected back to the main again downstream from the supply connection
C. Connected in series so the water circulates from the hot water supply main directly through all the convectors to the return main
D. Equipped with its own circulating pump
E. All supplied with water at the same temperature and the return from each convector flows by the shortest and most direct route back to the boiler
B. Supplied from the main and the return from each convector is connected back to the main again downstream from the supply connection
If the boiler water temperature was too low and the burner found to be out a probable cause would not be: Select one:
A. Flame failure device activated
B. Low air switch activated
C. Fuel valve not open
D. Low water cut off activated
E. Operating control set to low
E. Operating control set to low
Insufficient heat: Burner not lit: Setting controls too low or controls defective. Raise setting of temperature control and/or outdoor reset control…
Foreign material in a new system may break down chemically during the operation and if present in sufficient quantities, may cause the water to become: Select one:
A. Alkaline
B. Acidic
C. Soft
D. Hard
E. Dirty
B. Acidic
If there is restricted air flow through a heating unit the operator should check all but: Select one:
A. The filter is not plugged
B. Damper plates are fully closed
C. Curtains are restricting the air flow
D. Air passages are not restricted
E. A carpet is not restricting the air flow
B. Damper plates are fully closed
A little misleading, Damper plates should be fully open for proper functioning.
The term space heater is generally applied to a fired heater which is installed in the space to be heated and heats the air directly without the use of: Select one:
A. An open flame
B. A blower
C. A combustion chamber
D. Steam or water
E. Any ducting
E. Any ducting
B2P6-11
The term space heater is generally applied to a fired heater that is installed in the space to be heated and heats the air directly without the use of any ducting.
In a forced warm air heating system a fresh air supply duct allows a controlled amount of outside air to enter the system: Select one:
A. After it passes through the filter
B. Before it is heated
C. After it is heated
D. Before it passes through the filter
E. After the blower
D. Before it passes through the filter
B2P6-3
A fresh air supply duct allows a controlled amount of outside air to enter the system for ventilation purposes. This air mixes with the return air before it passes through the filters.
Actual ventilation rates vary from: Select one:
A. 0.14 to 1.1 m³/min (5 to 40 cfm)
B. 0.1 to 1.1 m³/min (3.5 to 40 cfm)
C. 0.14 to 2 m³/min (5 to 71 cfm)
D. 1.4 to 11 m³/min (49 to 388 cfm)
E. 0.1 to 2 m³/min (3.5 to 71 cfm)
A. 0.14 to 1.1 m³/min (5 to 40 cfm)
The air velocity through a viscous filter of _____ is common. Select one:
A. 2.0 m/s (400 ft/min)
B. 4.0 m/s (800 ft/min)
C. 7.5 m/s (1500 ft/min)
D. 4.5 m/s (900 ft/min)
E. 2.5 m/s (500 ft/min)
E. 2.5 m/s (500 ft/min)
With the _____ heating method of heating the heat is transferred from the source of heat to the air and/or persons and objects in these areas. Select one:
A. Hot water
B. Steam
C. Radiant
D. Direct
E. Convection
D. Direct
B3P9-9
Direct Heating
The electric heating equipment is installed in the areas to be heated. Thus, heat is transferred directly from the source of heat to the air and/or persons and objects in these areas.
A disadvantage of the metal sheath electric infrared heating element is its: Select one:
A. Vibration resistance
B. Mounting position
C. Impact resistance
D. Thermal shock resistance
E. Wind resistance
E. Wind resistance
What is the emission temperature of a directly fired refractory heater? Select one:
A. 980°C - 1260°C (1800°F - 2300°F)
B. 760°C - 900°C (1400°F - 1650°F)
C. 315°C - 455°C (600°F - 850°F)
D. 560°C - 790°C (1040°F - 1450°F)
E. 400°C - 500°C (750°F - 930°F)
A. 980°C - 1260°C (1800°F - 2300°F)
Calculate the relative humidity of a sample of air that at 21°C (70°F) holds 0.01 kg (0.022 lb) of moisture if the maximum that it can hold at this temperature is 0.015 kg (0.033 lb). Select one:
A. 10.7%
B. 0.33%
C. 25.8%
D. 6.7%
E. 93.3%
D. 6.7%
Answer is wrong: 0.01 x 100 / 0.015=66.7
Should be 66.7%
The steam pressure on a steam grid humidifier should be in the range of: Select one:
A. 30 kPa to 60 kPa (4.4 to 8.7 psi)
B. 40 kPa to 55 kPa (5.8 to 8 psi)
C. 35 kPa to 70 kPa (5.1 to 10.2 psi)
D. 25 kPa to 45 kPa (3.6 to 6.5 psi)
E. 20 kPa to 30 kPa (2.9 to 4.4 psi)
C. 35 kPa to 70 kPa (5.1 to 10.2 psi)
One of the wetted element humidifiers group is the _____ type. Select one:
A. Pan
B. Wet
C. Spray
D. Power
E. Steam
D. Power
Wetted element humidifiers can be divided into two general groups: Power type and Bypass type
A typical range for the pressure setting of an automatic fill valve (pressure reducing valve) in a hot water heating system is: Select one:
A. 100 to 200 kPa
B. 80 to 103 kPa
C. 103 to 125 kPa
D. 125 to 150 kPa
E. 50 to 100 kPa
C. 103 to 125 kPa
In modern installations the cast-iron radiator has largely been replaced by the: Select one:
A. Convector
B. Ventilator
C. Hot air furnace
D. Unit heater
E. Space heater
A. Convector
The low-capacity unit heater is usually not equipped with a/an: Select one:
A. Fan
B. Filter
C. Duct system
D. Blower
E. Combustion chamber
B. Filter
To avoid cavitation in the pump and drawing air into the system, a positive pressure at the highest point of the system should be maintained of at least: Select one:
A. 20 kPa (2.9 psi)
B. 100 kPa (14.5 psi)
C. 76 kPa (11 psi)
D. 12 kPa (1.7 psi)
E. 52 kPa (7.5 psi)
D. 12 kPa (1.7 psi)
The pressure system with pneumatic tank typically has a pump on/off pressure differential of: Select one:
A. 180 kPa (26 psi)
B. 100 kPa (14.5 psi)
C. 160 kPa (23.2 psi)
D. 120 kPa (17.4 psi)
E. 140 kPa (20 psi)
E. 140 kPa (20 psi)
In the _____ system the maximum building demand for water is less than the maximum flow available from a municipal or local distribution system. Select one:
A. Pressure with pneumatic tank
B. Tank variable pressure
C. Indirect constant pressure
D. Tankless constant pressure
E. Direct pressure
D. Tankless constant pressure
B2P12-3
Tankless constant pressure system:
This system is used when the maximum building demand for water is less than the maximum flow available from a municipal or local distribution system.
As water moves vertically up the risers in the building it will lose approximately _____ for every meter (for every foot) in elevation. Select one:
A. 20 kPa (2.9 psi)
B. 5 kPa (0.7 psi)
C. 15 kPa (2 psi)
D. 10 kPa (1.5 psi)
E. 25 kPa (3.6 psi)
D. 10 kPa (1.5 psi)
B2P12-3
Note that as the water moves vertically up the risers in the building, it will lose approximately 10 kpa for every metre (1/2 psi per foot) in elevation.
The pressure in the building plumbing system should not drop below ___ at any location:
A. 150 kpa (20 psi)
B. 175 kpa (25 psi)
C. 250 kpa (35 psi)
D. 300 kpa (42 psi)
B. 175 kpa (25 psi)
The CSA B52 Mechanical Refrigeration Code requires the pressure limiting device to be connected between the:
Select one:
A. Compressor and the first stop valve in the discharge line
B. Condenser and the first stop valve in the suction line
C. Evaporator and the first stop valve in the discharge line
D. Condenser and the first stop valve in the discharge line
E. Compressor and the first stop valve in the suction line
A. Compressor and the first stop valve in the discharge line
One of the most important secondary controls in a refrigerating system is the refrigerant flow control used to regulate the amount of liquid refrigerant flowing into the:
Select one:
A. Refrigerator
B. Refrigerated space
C. Evaporator
D. Receiver
E. Condenser
C. Evaporator
The low oil sump temperature protection device prevents the compressor from starting if the oil temperature falls below a preset value so that:
Select one:
A. The oil will flow freely
B. Any refrigerant dissolved in the oil is separated from the lubricant.
C. The oil will drain from the condenser
D. The oil viscosity will be low enough
E. The oil will drain from the evaporator
B. Any refrigerant dissolved in the oil is separated from the lubricant.
An evaporator pressure regulator prevents _____ conditions from occurring in the evaporator while the compressor is running.
Select one:
A. Low pressure and humidity
B. Low pressure and temperature
C. High pressure and temperature
D. High pressure and low temperature
E. Low pressure and high temperature
B. Low pressure and temperature
One of the three distinct classes of refrigeration controls is the _____ control.
Select one:
A. Actuating or secondary
B. Solenoid
C. Pressure actuated
D. Humidity actuated
E. Temperature actuated
A. Actuating or secondary
On larger capacity refrigeration compressors the _____ valves prior to starting.
Select one:
A. Open the suction and discharge
B. Open the bypass
C. Open the suction and close the discharge
D. Close the suction and open the discharge
E. Close the suction and discharge
D. Close the suction and open the discharge
What is the symptom of a refrigeration system when the compressor discharge pressure is too high due to the improper operation of the evaporative condenser?
Select one:
A. Fouled tubes in shell and tube condenser
B. Scaled coil surface
C. Non-condensables in system
D. Very hot condenser
E. Overcharge of refrigerant
B. Scaled coil surface
What is the symptom of a refrigeration system when the compressor suction pressure is too low due an obstructed expansion valve?
Select one:
A. Conditioned space too cold
B. Loss of capacity
C. Lack of refrigerant
D. Evaporator dirty or iced up
E. Compressor short-cycles
B. Loss of capacity
What is the symptom of a refrigeration system when the compressor fails to start due to an open control circuit?
Select one:
A. Seized compressor
B. Circuit breaker closed
C. Power on motor terminals
D. Full line voltage at terminals
E. No power on terminals of starter holding coil
E. No power on terminals of starter holding coil
What is the symptom of a refrigeration system when the compressor loses oil due Leaking joints or fittings on crankcase?
Select one:
A. Oil level drops steadily
B. Clogged return oil strainer
C. Oil does not return from oil separator
D. Oil around compressor
E. Oil trapped in evaporator
D. Oil around compressor
The refrigerant low temperature cutout is a safety low limit thermostat that senses the:?
Select one:
A. Refrigerant temperature in the condenser
B. Water temperature in the chiller
C. Refrigerant temperature in the chiller
D. Refrigerant pressure in the chiller
E. Water temperature in the evaporator
C. Refrigerant temperature in the chiller
The refrigerant low temperature cutout is a safety low limit thermostat that senses the:
Select one:
A. Refrigerant temperature in the chiller
B. Refrigerant pressure in the chiller
C. Refrigerant temperature in the condenser
D. Water temperature in the evaporator
E. Water temperature in the chiller
A. Refrigerant temperature in the chiller
The leakage of air into a refrigeration system that operates below atmospheric pressure will cause the _____ to cycle more often.
Select one:
A. Expansion valve
B. Purge unit
C. Condenser cooling water regulator
D. Compressor
E. Evaporator level control
B. Purge unit
A pilot type of air compressor unloader may operate in all except one of the following ways:
Select one:
A. It may hold the cylinder inlet valves open if the compressor is a reciprocating type
B. It may close the compressor intake line if compressor is a dynamic type
C. It may open a by-pass valve in the intake back to the compressor discharge
D. It may open a by-pass valve in the discharge back to the compressor intake
E. It may open a bleed valve to atmosphere and simply dump to atmosphere if the compressor is a large dynamic type
C. It may open a by-pass valve in the intake back to the compressor discharge
Some uses of compressed air in buildings include all of the following except:
Select one:
A. Operating fire protection equipment
B. Spray painting
C. Blast cleaning or sandblasting surfaces
D. Cleaning and sanitizing
E. Operating tools
D. Cleaning and sanitizing
Air dryers may use adsorbents like Silica-gel that is very porous and has an extremely large surface it is able to hold a large amount of moisture up to _____ of its own weight.
Select one:
A. 60%
B. 50%
C. 40%
D. 30%
E. 20%
C. 40%
The applicable code requires a stop valve on the inlet of each liquid receiver of systems containing _____ or more of refrigerant, except when the receiver is part of a condensing unit or forms an integral part of a condenser.
Select one:
A. 100.0 kg (220 lb)
B. 75.0 kg (165 lb)
C. 5.0 kg (11 lb)
D. 50.0 kg (110 lb)
E. 25.0 kg (55 lb)
D. 50.0 kg (110 lb)
A _____ valve should be installed at the beginning of each supply riser and the end of each return riser so that each section can be shut off for servicing without interrupting the operation of the remainder of the heating system.
Select one:
A. Ball or plug
B. Gate or ball
C. Plug or gate
D. Globe or ball
E. Ball or butterfly
B. Gate or ball
In the flooded shell and tube evaporator, the liquid refrigerant is:
Select one:
A. Around the shell
B. Over the tubes
C. Around the tubes
D. Under the shell
E. In the tubes
C. Around the tubes
Thermal conductance (C) is the:
Select one:
A. Reciprocal of thermal conductance, it is the value of a given material’s ability to resist heat transfer or flow (m²°C/W) (ft²°F/Btu/hr)
B. Thermal heat flow through a unit area of a non-uniform, composite material when a unit average temperature difference is established between the surfaces (W/m²°C) (Btu/hr/ft²°F)
C. Thermal heat flow, by conduction only, through a unit area of a single uniform type of material (W/m°C) (Btu/hr/ft²°F)
D. Thermal heat flow (transmission) through unit areas of a wall, door, window, etc., for every degree temperature difference between the air/fluid inside and the air/fluid outside. (W/m²K or W/m²°C) (Btu/hr/ft²R or Btu/hr/ft²°F)
E. Quantity of heat flow from all mechanisms, in unit time, under the conditions prevailing at that time (Q or W)
B. Thermal heat flow through a unit area of a non-uniform, composite material when a unit average temperature difference is established between the surfaces (W/m²°C) (Btu/hr/ft²°F)
The applicable code requires that when a pressure gauge is permanently installed on the high side of a system, the dial of the gauge must be graduated up to _____ the operating pressure.
Select one:
A. 1.5 times
B. 1 times
C. 3 times
D. 2.5 times
E. 2 times
E. 2 times
Temperatures used in radiant panel heating in ceilings should not exceed:
Select one:
A. 38°C (100°F)
B. 46°C (115°F)
C. 52°C (126°F)
D. 25°C (77°F)
E. 30°C (86°F)
B. 46°C (115°F)
The refrigeration system condenser pressure should be slightly higher than the saturation pressure corresponding to the temperature of the refrigerant in the:
Select one:
A. Upstream side of the compressor
B. Condenser
C. Downstream side of the expansion valve
D. Accumulator
E. Evaporator
B. Condenser
The temperature of under normal conditions will be about _____ near the end of the compression stroke.
Select one:
A. 90°C (194°F)
B. 150°C (302°F)
C. 175°C (347°F)
D. 75°C (167°F)
E. 225°C (437°F)
A. 90°C (194°F)
Refrigerants that are non-toxic and non-flammable belong to Group:
Select one:
A. A2
B. B2
C. A1
D. B1
E. A3
C. A1
The CSA B52 Mechanical Refrigeration Code requires that all refrigeration systems containing more than _____ kg of refrigerant and operating above atmospheric pressure shall be equipped with a pressure limiting device.
Select one:
A. 20 kg (44.1 lb)
B. 9 kg (19.8 lb)
C. 15 kg (33.1 lb)
D. 12 kg (26.4 lb)
E. 5 kg (11 lb)
B. 9 kg (19.8 lb)
A _____ is a grille equipped with a damper to control the amount of air passing through.
Select one:
A. Adjustable louvre register
B. Ceiling diffuser
C. Grille
D. Fixed louvre register
E. Register
E. Register
The shell and tube condenser is fitted with:
Select one:
A. Dry boxes
B. Water boxes
C. End plates
D. Wet boxes
E. Water plates
B. Water boxes
What code contains guidelines for the care and operation of heating boilers?
Select one:
A. CSA B52.
B. ASME Section IV.
C. CSA B51.
D. ASME Section VI.
E. NFPA.
D. ASME Section VI.
What code contains Rules For Construction of low-pressure hot water supply boilers?
Select one:
A. CSA B52.
B. ASME Section IV.
C. CSA B51.
D. ASME Section VIII.
E. NFPA.
B. ASME Section IV.
The Pressure Vessels” section of the B-51 code identifies pressure vessels and their installation
Select one:
a. Fuel tanks.
b. Blowdown tanks.
c. Dearators.
d. Boiler drums.
e. Hydropneumatic tanks
c. Dearators.
How many horsepower-hours are equal to 13 megajoules?
Select one:
A. 4.84 hp-hr
B. 44.42 hp-hr
C. 3.11 hp-hr
D. 33.02 hp-hr
E. 34.91 hp-hr
A. 4.84 hp-hr
In division the answer is called the:
Select one:
A. Dividend
B. Divisor
C. Index
D. Factor
E. Quotient
E. Quotient
In multiplication the two numbers are called the:
Select one:
A. Multiplicands
B. Addends
C. Factors
D. Products
E. Multipliers
C. Factors
In multiplication the number by which it is multiplied is called the:
Select one:
A. Addend
B. Factor
C. Multiplicand
D. Multiplier
E. Product
D. Multiplier
Transpose I = E / R for R =:
Select one:
A. E / R
B. E / I
C. EI
D. IR
E. ER
B. E / I
The formula for the area of a circle is area (A) = πR² transpose for R =:
Select one:
A. π / A
B. A / π
C. √(A / π)
D. √A / π
E. √Aπ
C. √(A / π)
The formula for the area of a circle is area (A) = 0.7854D² transpose for D =:
Select one:
A. 0.7854D²
B. √(0.7854 / A)
C. √A / 0.7854
D. √(A / 0.7854)
E. A / 0.7854
D. √(A / 0.7854)
The formula for the area of a circle is area (A) = πR² transpose for π =:
Select one:
A. √(A / R)
B. A / R²
C. √A / R²
D. √AR²
E. R² / A
B. A / R²
Transpose P = EI for E =:
Select one:
A. P / E
B. PI
C. I / P
D. P / I
E. I / E
D. P / I
Transpose I = P / E for P =:
Select one:
A. IP
B. EI
C. P / I
D. E / P
E. E / I
B. EI
The formula for finding the area of a square is:
Select one:
A. l x w
B. πD
C. S²
D. l x w x h
E. S³
C. S²
Temperature may be considered a measurement of:
Select one:
A. Heat
B. Density
C. Speed
D. Mass
E. Weight
C. Speed
Kinetic energy (KE) is:
Select one:
A. The product of the force applied and the distance moved
B. The ability of a body to do work due to its motion
C. Capacity of a body or substance to perform work
D. The rate of doing work
E. Ability of a body to do work by virtue of its position
B. The ability of a body to do work due to its motion
Pressure can be defined as:
Select one:
A. A push or pull exerted on an object
B. The rate of change of position
C. Force per unit area
D. The amount of substance of something
E. Capacity of a body or substance to perform work
C. Force per unit area
A low hardness test normally done on a water sample from the:
Select one:
A. Deaerator
B. Boiler
C. Raw or city water
D. Softener outlet
E. Blowdown line
D. Softener outlet
Organics if allowed to enter the boiler will:
Select one:
A. Settle in lower areas interfering with proper heat transfer and circulation
B. Cause foaming in the boiler
C. End up somewhere such as heat exchanger surfaces or turbine blading
D. Precipitate out of solution
E. Cause corrosion in the boiler
B. Cause foaming in the boiler
Calcium bicarbonate in the boiler feedwater produces:
Select one:
A. Temporary hardness and permanent hardness
B. Temporary hardness, very low solubility
C. Temporary hardness, very high solubility
D. Permanent hardness, very low solubility
E. Permanent hardness, very high solubility
B. Temporary hardness, very low solubility
The phosphate test on boiler water is conducted using the _____ method.
Select one:
A. Penetration
B. Titration
C. Meter
D. Tensile
E. Comparison
C. Meter
Workers may refuse to work if the Health and Safety ______ are not followed on a worksite. (Select all that apply)
Select one or more:
a. Acts
b. Recommendations
c. Policies
d. Guidelines
e. Regulations
a. Acts
e. Regulations
The specific heat of ice is equal to:
Select one:
A. 2.135 kJ/kg/°C
B. 335 kJ/kg
C. 2257 kJ/kg
D. 4.183 kJ/kg/°C
E. 2.093 kJ/kg/°C
A. 2.135 kJ/kg/°C
A weld sample used for destructive testing is called a/an:
Select one:
A. Coalescence
B. Bare electrode
C. Test specimen
D. Coupon
E. Fusion
C. Test specimen
SOPs should be:
Select one:
a. Printed in large numbers
b. attached to each revised copy.
c. destroyed and replaced monthly
d. Reviewed at regular intervals
a. Printed in large numbers
Stresses remaining in a structure, as a result of welding are called:
Select one:
A. Reaction stress
B. Residual stress
C. Procedure qualification
D. Preheating
E. Postheating
B. Residual stress
How many British thermal units are equal to 185 kilocalories?
Select one:
A. 734.08 Btu
B. 469.9 Btu
C. 175.38 Btu
D. 195.14 Btu
E. 46.62 Btu
A. 734.08 Btu
On a P&ID, symbols are used for instrumentation the first letter stands for
Select one:
a. The type of instrument
b. The type of alarm
c. The type of process
d. What is being measured
d. What is being measured
If the pressure is 100 kPa absolute the 1 litre of water will become about _____ litres of steam.
Select one:
A. 2257
B. 1695
C. 460
D. 129 000
E. 335
B. 1695
