375 SET 2

Question 1

How do you call a measure of alkaline components in oils, especially those additives used in engine oils to neutralize acids formed during fuel combustion?

a) Neutralization number
b) Total base number
c) Total acid number
d) Neutralization number and total acid number

Answer 1

b) Total base number

Question 2

Petroleum oils, when cooled, may become plastic solids, either from wax formation or from the fluid congealing. With some oils, the initial wax crystal formation becomes visible at temperatures slightly above the solidification point. When that temperature is reached at specific test conditions, it is known as the

a) Cloud point
b) Pour point
c) Creep point
d) Flash point

Answer 2

a) Cloud point

Question 3

Which of the following types of alcohol is the most frequently considered as fuel for internal combustion engine?

a) Methyl alcohol
b) Isopropyl alcohol
c) Ethyl alcohol
d) Alcogas

Answer 3

c) Ethyl alcohol

Question 4

The one that is an acceptor impurity element

A. Antimony
B. Gallium
C. Arsenic
D. Phosphorus

Answer 4

B. Gallium

Question 5

It is a science of motion that can be solved in terms of scalar or vector algebra.

a) Kinematics
b) Curvilinear translation
c) Projectile
d) Acceleration

Answer 5

a) Kinematics

Question 6

What is the basic index used to describe the radiant conditions in a space, it is the mean temperature of an individual; exposed surfaces in the environment?

a) Index temperature
b) Mean radiant temperature
c) Space temperature
d) Dry bulb temperature

Answer 6

b) Mean radiant temperature

Question 7

Unless they are designed to flood, what is the important when removing condensate from heat exchangers?

a) Condensate is allowed to sub-cool before reaching the trap
b) Condensate is removed at steam temperature
c) Condensate should back-up into the steam pipe
d) That the trap is fatted level with or above the heater outlet

Answer 7

b) Condensate is removed at steam temperature

Question 8

The hygroscopic moisture content of a substance expressed as a percentage of the bone-dry-weight of the material.

a) Moisture content
b) Regain
c) Bone-dry-weight
d) Gross weight

Answer 8

b) Regain

Question 9

Which of the following is the most important consideration in a fire prevention program?

a) Train the staff to place flammable in fireproof containers
b) Know how to attack fires regardless of size
c) See that halls, corridors, and exits are not blocked
d) Detect and eliminate every possible fire hazard

Answer 9

d) Detect and eliminate every possible fire hazard

Question 10

It is any one of a group of refrigerants that have been developed since about 1925 to overcome the irritating or toxic effects of refrigerants, such as ammonia and sulfur dioxide and the high condensing pressures required with carbon dioxide. How do you call these refrigerants?

a) Halogenated refrigerants
b) Freon refrigerants
c) Vacuum refrigerants
d) Halocarbon refrigerants

Answer 10

a) Halogenated refrigerants

Question 11

The bottom blows down on a boiler is used to:

a) Remove mud drum water impurities
b) Increase boiler priming
c) Reduce steam pressure in the header
d) Increase the boiler water level

Answer 11

a) Remove mud drum water impurities

Question 12

Which of the following gasket materials should be used on a Freon system?

A. Metallic
B. Asbestos
C. Rubber
D. A and B

Answer 12

D. A and B

Question 13

It represents the rate, in Btu/hr or W, at which heat enters a conditioned space from an external source or is released to the space from an internal source during a given time interval.

a) Space heat gain
b) Space cooling load
c) Space heating load
d) Space heat extraction rate

Answer 13

a) Space heat gain

Question 14

How do you call the ratio of the product of a convective heat transfer coefficient and the critical radius of the insulator to that of the thermal conductivity of the insulator?

a) Biot number
b) Prandtl number
c) Nusselt number
d) Reynolds number

Answer 14

a) Biot number

Question 15

It is the temperature at which cooled oil will just flow under Specifc test conditions; and it indicates the lowest temperature at which a lubricant can readily flow from its container. How do you call this temperature?

a) Cloud point
b) Pour point
c) Creep point
d) Flash point

Answer 15

b) Pour point

Question 16

For any particular tank temperature how does the heat loss from the lid of a closed tank compare with that of bottom?

a) They are approximately double those from the bottom
b) Losses from the top are approximately double those from the bottom
c) losses from the bottom are approximately double those from the top
d) losses from the top are approximately 4 times those from the bottom

Answer 16

b) Losses from the top are approximately double those from the bottom

Question 17

Any refrigerant that exists as a liquid under normal atmospheric pressure and temperature must be vaporized in an evaporator under a pressure below atmospheric. This is sometimes referred to as:

a) Halogenated refrigerant
b) Freon refrigerant
c) Vacuum refrigerant
d) Halocarbon refrigerant

Answer 17

c) Vacuum refrigerant

Question 18

Most of the bacteria in sewage are:

a) Saprophytic
b) Dangerous
c) Parasitic
d) Pathogenic

Answer 18

a) Saprophytic

Question 19

Peaucellier mechanism has how many links?

a) 4
b) 5
c) 6
d) 8

Answer 19

d) 8

Question 20

Which of the following is the rate at which the velocity is changing?

a) Acceleration
b) Linear
c) Motion
d) Vertical

Answer 20

a) Acceleration

Question 21

Hard water is water, which contains soluble salts of which of the following elements?

A. Sodium
B. Sulfur
C. Calcium
D. Chlorine

Answer 21

C. Calcium

Question 22

Why is slow, controlled warm-up of a steam system essential?

a) To make it easier to open the boiler main stop valve
b) To minimize undue stresses and eliminate damage
c) To permit separators to remove more water
d) To prevent stress on the boiler

Answer 22

b) To minimize undue stresses and eliminate damage

Question 23

The relative humidity of saturated air is:

a. 0%
b. 75%
c. 25%
d. 100%

Answer 23

d. 100%

Question 24

Ackerman steering gear is made up of

a) rolling and sliding pairs
b) rolling pairs
c) sliding and rotary pairs
d) turning pairs

Answer 24

d) turning pairs

Question 25

These are engine oil additives used to allow air to break away easily from the oil.

a) Anti-wear additives
b) Defoamants
c) Oxidation inhibitors
d) Rust inhibitors

Answer 25

b) Defoamants

Question 26

The least number of compressors in a multi-stage system is

a. 4
b. 3
c. 2
d. 1

Answer 26

c. 2

Question 27

absorbed by the refrigerant at the evaporator. For central hydronic systems, it is the sum of the coil load plus the chilled water piping heat gain, pump power heat gain, and storage tank heat gain. For most water systems in commercial buildings, the water piping and pump power heat gain is only about 5 to 10 percent of the coil load. In an air conditioning system using DX coil(s), it is equal to the DX coil load.

a) Coil load
b) Heating coil load
c) Refrigerating load
d) Cooling load

Answer 27

c) Refrigerating load

Question 28

How do you call a device or engine which continually and indefinitely discharged more energy than it receives?

a) Carnot engine
b) Generating machine
c) Stirling engine
d) Perpetual motion machine

Answer 28

d) Perpetual motion machine

Question 29

The nonferrous alloy corrodes in ammonia is

A. Copper
B. Bronze
C. Brass
D. All of these

Answer 29

D. All of these

Question 30

What is the effect of an overloaded boiler?

a) Water level rises and lock-out occurs
b) Reduced steam production
c) Water level drops and lock-out occurs
d) Steam velocity reduces and separator efficiency drops

Answer 30

c) Water level drops and lock-out occurs

Question 31

In the deep well installing or operation, the difference between static water level and operating water level is called:

a) Suction lift
b) drawdown
c) priming level
d) clogging

Answer 31

b) drawdown

Question 32

Steel can be strengthened by all of the following practices, EXCEPT:

A. Annealing
B. Quenching and tempering
C. Work hardening
D. Grain refinement

Answer 32

A. Annealing

Question 33

What do you call the method used to evaluate all welds performed on pressure parts of boiler tube materials?

a) Radiographic test
b) Hydrostatic test
c) Vacuum test
d) Orsat analysis

Answer 33

a) Radiographic test

Question 34

This refrigeration system component combines the functions of a cooling tower and a condenser. It consists of a casing enclosing a fan or blower section, water eliminators, refrigerant condensing coil, water pan, float valve, and spray pump outside the casing. How do you call this component?

a) Water-cooled condenser
b) Evaporative condenser
c) Atmospheric condenser
d) Chiller

Answer 34

b) Evaporative condenser

Question 35

The follower reciprocates or oscillates in a plane perpendicular to the axis of rotation of the cam.

a) Radial cam
b) Cylindrical cam
c) Cam curves
d) Tangential cam

Answer 35

a) Radial cam

Question 36

The maximum stress to which a standardized test specimen may be subjected without permanent deformation.

A. Endurance limit
B. Proportional limit
C. Elastic limit
D. Plastic limit

Answer 36

C. Elastic limit

Question 37

What is a common cause of water-hammer in drying coils?

a) Wet steam supplied to the coil
b) Too low a steam pressure onto the coil
c) Condensate has to lift after the steam trap
d) The coil falling in the direction of steam flow

Answer 37

c) Condensate has to lift after the steam trap

Question 38

What is a characteristic feature of thermodynamic steam traps?

a) They pass condensate at steam temperature
b) They operate by holding back condensate until it has cooled
c) They cannot be fitted outside
d) They can only be fitted on low pressure steam systems

Answer 38

b) They operate by holding back condensate until it has cooled

Question 39

How do you call a system employing open sprinklers attached to a piping system connected to a water supply through which is opened by the operation of a fire detection system installed in the same areas as the sprinklers?

a) Mechanical sprinkler
b) Automatic system
c) Wet pipe system
d) Deluge system

Answer 39

d) Deluge system

Question 40

What always accompanies an isentropic expansion of steam?

a) An increase in entropy
b) An increase in enthalpy
c) A decrease in entropy
d) A decrease in enthalpy

Answer 40

d) A decrease in enthalpy

Question 41

If Pb is the Absolute pressure on the surface of the liquid, Z is the suction lift of the pump, hf is the total friction head loss and Pv is the vapor pressure of the liquid at the Determine existing temperature. corresponding NPSH of the pump.

a. NPSH = (PB - Pv)/w + Z+hf
b. NPSH (PB - Pv)/w + Z-hf
c. NPSH = (PB + Pv)/w + Z-hf
d. NPSH = (PB + Pv)/w +Z+hf

Answer 41

b. NPSH (PB - Pv)/w + Z-hf

Question 42

This is the velocity at which a small pressure wave moves through a fluid. How do you call this velocity?

a) Sonic velocity
b) Subsonic velocity
c) Supersonic velocity
d) Hypersonic velocity

Answer 42

a) Sonic velocity

Question 43

Pitot tube is used to measure.

a) Height
b) Velocity
c) Viscosity
d) Density

Answer 43

b) Velocity

Question 44

When adding the refrigerant in a refrigeration system, it shall be charge into which of the following parts of the system?

a) High pressure side
b) Low pressure side
c) low- and high-pressure side
d) Compressor discharge line

Answer 44

b) Low pressure side

Question 45

A mechanical device used in refrigeration system for purpose of increasing the pressure upon the refrigerant.

a. Pump
b. compressor
c. expansion valve
d. drier

Answer 45

b. compressor

Question 46

Klein’s construction can be used when

a) crank has a uniform angular acceleration
b) crank has a uniform angular velocity
c) crank has a non-uniform angular velocity
d) b and c above

Answer 46

d) b and c above

Question 47

It is a term used by automobile manufacturers to designate the power required to move a car horizontally at 50 mi/hr against the drag force. What is this?

a) Mechanical horsepower
b) Aero horsepower
c) Fuel power
d) Fluid power

Answer 47

b) Aero horsepower

Question 48

It has magnitude, direction and sense.

a) scalar quantity
b) absolute quantity
c) vector quantity
d) relative velocity

Answer 48

c) vector quantity

Question 49

If 1080 steel is annealed by very slow cooling from 1000 C to ambient temperature, its microstructure will consist almost solely of:

A. Austenite
B. Bainite
C. Cementite
D. Pearlite

Answer 49

D. Pearlite

Question 50

What do you call a form of boiler fuel that is easy to burn, with very little excess air?

a) Coal
b) Oil
c) Gas
d) Bunker

Answer 50

c) Gas

Question 51

Pressure Vessels, it is any boiler which does not exceed any of the following limits: 405 mm inside diameter, 1065 mm overall length of outside-to-outside heats at center, 1.85 m2 of water heating surface, and 7.03 kg/cm2 maximum allowable working pressure. What is this boiler?

a) Power boiler
b) Portable boiler
c) Miniature boiler
d) locomotive boiler

Answer 51

c) Miniature boiler

Question 52

Valves and piping in an ammonia system are made of

A. Iron
B. Bras
C. Copper
D. Bronze

Answer 52

A. Iron

Question 53

What do you call a shut-off valve other than a valve for controlling the flow of refrigerant in a refrigeration system?

a) Fusible valve
b) Stop valve
c) Check valve
d) Relief valve

Answer 53

b) Stop valve

Question 54

When a metal is cold worked, all of the following generally occur, EXCEPT:

A. Ductility decreases
B. Grains become equal-axed
C. Tensile strength increases
D. Slip or twinning occurs

Answer 54

B. Grains become equal-axed

Question 55

What is the advantage of a pressurized deaerator oven an atmospheric deaerator?

a) A boiler feed tank is no longer required
b) less over all energy will be required to produce the steam
c) It can be fitted at ground level
d) It removes more oxygen.

Answer 55

d) It removes more oxygen.

Question 56

What is probably the first consideration when selecting a control system?

a) What degree of accuracy is required?
b) Is the control for heating or cooling?
c) Is a two or three port valve required?
d) In the event of power failure, must the valve fail-open or fail-closed?

Answer 56

d) In the event of power failure, must the valve fail-open or fail-closed?

Question 57

Which of the following metals has the highest specific heat capacity at 100C?

A. Aluminum
B. Bismuth
C. Copper
D. Iron

Answer 57

A. Aluminum

Question 58

Which of the following is a characteristic of an impulse turbine?

a) Steam striking blades on angle
b) No steam reaction to velocity
c) Steam striking blades at zero angle
d) Steam reversing direction

Answer 58

c) Steam striking blades at zero angle

Question 59

Net positive suction head (NPSH) can be increased by which of the following:

a. increasing the height of the free fluid level on the supply tank
b. reducing the temperature of the fluid
c. using larger pipe size in the suction side
d. all of these

Answer 59

d. all of these

Question 60

As compared to a power-driven triplex single-acting pump of the same size and operating at the same speed, a steam-driven duplex double-acting pump will:

a) Pump more water per minute
b) Give a more uniform discharge
c) Have a higher first cost
d) Be more economical to operate

Answer 60

a) Pump more water per minute

Question 61

Compare the refrigerating effect per unit mass of refrigerant for a saturated cycle and for a superheated cycle that produces useful cooling, for the same vaporizing and condensing temperature.

a. for a superheated cycle
b. lower for superheated cycle
c. greater for saturated cycle
d. lower for saturated cycle

Answer 61

a. for a superheated cycle

Question 62

In a mechanical steam trap, what added benefit does the automatic air vent offer to a float trap?

a) It stops the trap from freezing in cold weather
b) The trap can be use on larger backpressures
c) It significantly increases the cold start-up capacity of the trap
d) The condensate orifice can be the same size for all pressure gauges

Answer 62

c) It significantly increases the cold start-up capacity of the trap

Question 63

Each miniature boiler shall be equipped with which of the following for the determination of water level?

a) Safety valve
b) Fusible plug
c) Water gage glass
d) Pressure gages

Answer 63

c) Water gage glass

Question 64

What do you call a vessel in which pressure is obtained from external sources, or from an indirect application of heat?

a) Boiler or steam generator
b) Fired pressure vessel
c) Unfired pressure vessel
d) Pressurized tank

Answer 64

c) Unfired pressure vessel

Question 65

Scale in boiler can:

a) Create low steam quality
b) Cause foaming
c) Overheat blow off line
d) Inhibit circulation and heat transfer

Answer 65

d) Inhibit circulation and heat transfer

Question 66

Any heating and cooling of steel that produces a rounded or globular form of carbide.

A. Spheroidizing
B. Malleability
C. Graphizing
D. Normalizing

Answer 66

A. Spheroidizing

Question 67

The mass and temperature of a gas are inversely proportional at a constant pressure process. This is known as:

a. Dalton’s law
b. law of buoyancy
c. Charles law
d. Newton’s second law

Answer 67

c. Charles law

Question 68

It is a component in a hydro plant that absorbs water hammer during load fluctuations and serves as an auxiliary reservoir during high load demands. What is this component?

a) Spillway
b) Dam
c) Surge tank
d) penstock

Answer 68

c) Surge tank

Question 69

For a kinematics chain to be considered as mechanism,

a) none of the links should be fixed
b) one link should be fixed
c) there is no such criterion
d) two links should be fixed

Answer 69

b) one link should be fixed

Question 70

It is a type of dryer in which the gases of combustion pass through the spaces surrounding, or in other ways heating, the drying chamber, but the gases are not allowed in contact with the material being dried. What is this dryer?

a) Direct-heat type dryer
b) Indirect-heat type dryer
c) Steam-heated type dryer
d) Rotary Dryer

Answer 70

b) Indirect-heat type dryer

Question 71

Steam coils should enter and leave the top of a tank when:

a) The tank contains a corrosive solution
b) When agitation of the tank solution is required
c) When steam locking the trap draining a base coil could occur
d) When good heat distribution is required

Answer 71

a) The tank contains a corrosive solution

Question 72

What does MAWP stand for?

a) Maximum attenuated working pressure
b) Maximum allowable working pressure
c) Maximum allowable with pressure
d) Minimum allowable working pressure

Answer 72

b) Maximum allowable working pressure

Question 73

Which of the following are principal dissolved solids that are scale forming?

a) Carbonates and sulphates of sodium
b) Calcium bicarbonate
c) Carbonates and sulphates of magnesium
d) Bicarbonate of sodium and magnesium

Answer 73

c) Carbonates and sulphates of magnesium

Question 74

In a refrigeration system, which of the following would cause a high suction pressure?

a) Expansion valve not open wide enough
b) Expansion valve open too wide
c) King valve not open wide enough
d) Dirty dehydrator

Answer 74

b) Expansion valve open too wide

Question 75

These engine oil additives are used to improve fuel efficiency by reducing friction at rubbing surfaces. How do you call these oil additives?

a) Anti-wear additives
b) Friction modifiers
c) Oxidation inhibitors
d) Rust inhibitors

Answer 75

b) Friction modifiers

Question 76

Define a “control valve”.

a) The value set on the scale of the control system in order to obtain the required condition
b) The quantity or condition of the controlled medium
c) The flow or pressure of the steam (or fluid) being manipulated
d) The valve of the controlled condition actually maintained under steady state conditions

Answer 76

d) The valve of the controlled condition actually maintained under steady state conditions

Question 77

Which of the following is true regarding the relation of rk and re for spark-ignition engine, where rk = compression ratio while re = expansion ratio?

a) rk > re
b) rk < re
c) rk = re
d) re is not considered in the spark-ignition engine

Answer 77

c) rk = re

Question 78

Instantaneous center of rotation of a link in a four-bar mechanism lies on

a) a point obtained by intersection of extending adjoining links
b) left side pivot of this link
c) right side pivot of this link
d) any of the choices above

Answer 78

a) a point obtained by intersection of extending adjoining links

Question 79

It is the rate, in Btu/h or W, of heat transfer at the coil. Its cooling load component is the rate at which heat is removed by the chilled water flowing through the coil or is absorbed by the refrigerant inside the coil. What do you call this?

a) Coil load
b) Heating coil load
c) Refrigerating load
d) Cooling load

Answer 79

a) Coil load

Question 80

It is a boiler testing method that is used to verify the microstructure of the boiler tubes using optical microscopes. How do you call this method?

a) Tube sampling
b) Metallurgic replication
c) Radiographic testing
d) Optical testing

Answer 80

b) Metallurgic replication

Question 81

Which of the following statements is true?

a) Bimetallic steam traps are an ideal choice for rotating cylinders
b) Rotating cylinders cannot suffer from steam locking
c) Strainers cannot be fitted to float traps which have a steam lock release
d) Air vents around the thermodynamic and inverted bucket traps can considerably improve start-up times

Answer 81

d) Air vents around the thermodynamic and inverted bucket traps can considerably improve start-up times

Question 82

In the critical thickness of insulator concept for a cylinder, what does the Biot number indicate if its value is less than 1?

a) Condition for optimum heat flow
b) Addition of insulation will increase heat transfer rate
c) Additional insulation will decrease the heat transfer rate
d)Heat transfer rate reaches a maximum

Answer 82

b) Addition of insulation will increase heat transfer rate

Question 83

Which medium has highest value of dielectric strength?

A. Glass
B. Mica
C. Porcelain
D. Quartz

Answer 83

B. Mica

Question 84

It is one that is not appreciably deformed by the action of any external force or load.

a) rigid body
b) structure
c) Frame
d) Mechanism

Answer 84

a) rigid body

Question 85

A Scott-Russell mechanism is made

a) rotating pair only
b) sliding and turning pairs
c) turning and rotary pairs
d) turning pair only

Answer 85

b) sliding and turning pairs

Question 86

A Pantograph is a mechanism having

a) higher pairs
b) lower pairs
c) rolling pairs
d) spherical pairs

Answer 86

b) lower pairs

Question 87

The laminations are made from

A. Low carbon steel
B. Silicon sheet steel
C. Nickel alloy steel stays
D. Chrome steel sheets

Answer 87

B. Silicon sheet steel

Question 88

An evaporator constructed of pipe or tubing.

a. expansion coil
b. condenser coil
c. evaporative condenser
d. cooling tower

Answer 88

a. expansion coil

Question 89

What is the rate, in Btu/h or W, at which heat must be added to the conditioned space to maintain a constant temperature and sometimes a specified relative humidity?

a) Space heat gain
b) Space cooling load
c) Space heating load
d) Space heat extraction rate

Answer 89

c) Space heating load

Question 90

Name one disadvantage of a direct acting pressure reducing valve.

a) It only has proportional control
b) It has proportional and integral control but no derivative control
c) It operates in an on/off fashion
d) An external power source is required for it
to operate

Answer 90

a) It only has proportional control

Question 91

Can temperature-controlled applications be trapped?

a) Traps should not be fitted under any circumstances
b) Only if there is no lift after the trap
c) If the pressure on the trap is always higher than backpressure
d) Pumps should always be fitted to remove condensate

Answer 91

c) If the pressure on the trap is always higher than backpressure

Question 92

How do you call a process in which superheated steam is either restored to its saturated state, or its superheated temperature is reduced?

a) Superheating
b) Reheating
c) Regenerative heating
d) Desuperheating

Answer 92

d) Desuperheating

Question 93

Why are two-gauge glasses often fitted?

a) One is a check against the other
b) One is a reserve
c) It is a legal requirement
d) To increase periods between maintenance

Answer 93

c) It is a legal requirement

Question 94

It the maximum temperature of any gas or vapor at which it may be condensed into a liquid; above this temperature, it is impossible to condense regardless of the pressure applied.

a) Saturation temperature
b) Superheated temperature
c) Critical temperature
d) Dew point temperature

Answer 94

c) Critical temperature

Question 95

For saturated air, the value of dry bulb, wet bulb and dew point temperature is

a. Proportional
b. inversely proportional
c. the same
d. unity

Answer 95

c. the same

Question 96

Select from the conductors below that has the least electrical conductivity

A. Lead
B. Tin
C. Zinc
D. Aluminum

Answer 96

A. Lead

Question 97

A tank is to be heated by direct steam injection. How will the quantity of heat required compare with steam coil heating?

a) It depends on the temperature of the water being heated
b) More heat will be required
c) The same amount of heat will be required
d) less heat will be required

Answer 97

c) The same amount of heat will be required

Question 98

When acceleration is zero, the

a) velocity is constant
b) velocity is negative
c) velocity is variable
d) velocity is zero

Answer 98

a) velocity is constant

Question 99

Two pumps are connected in parallel, if Q1 is the discharge of Pump 1 and Q2 is the discharge of Pump 2 where Q2

Answer 99

b. Q1 + Q2

Question 100

A shaft revolving in a bearing forms a

a) Cylindrical pair
b) higher pair
c) lower pair
d) sliding pair

Answer 100

c) lower pair

Question 101

It is a type of refrigeration system where only part of the circulated refrigerant is evaporated, with the remainder being separated from the vapor and then recirculated. How do you call this system?

a) Absorption refrigeration system
b) Vacuum refrigeration system
c) Vapor-compression refrigeration system
d) Flooded refrigeration system

Answer 101

d) Flooded refrigeration system

Question 102

Which of the following are the four stages of the warning system designated by the high air pollution alert warning system?

a) Initial, chronic, acute, penetrating
b) Forecast, alert, warning, emergency
c) light, medium, heavy, extra heavy
d) Early, moderate, severe, toxic

Answer 102

b) Forecast, alert, warning, emergency

Question 103

Of the following, the best method used to determine the moisture level in a refrigeration system is to:

a) Weigh the driver after it has been in the system for a period of time
b) Use a moisture indicator
c) Visually check the sight glass for particles of corrosion
d) Test a sampler lubricating oil with phosphorus pentoxide

Answer 103

b) Use a moisture indicator

Question 104

Specific speed of a centrifugal pump is to its operating speed.

a. indirectly proportional
b. directly proportional
c. inversely proportional
d. unity

Answer 104

b. directly proportional

Question 105

The automatic shut off valves for a water gage installed on a high-pressure boiler must be:

a) Horizontal swing-check valves
b) Vertical swing-check valves
c) Ball-check valves
d) Spring-loaded check valves

Answer 105

c) Ball-check valves

Question 106

A material best suited for manufacturing of fuse wire

A. Aluminum
B. Silver
C. Lead
D. Copper

Answer 106

B. Silver

Question 107

What effect does steam locking have on rotating machinery?

a) None at all
b) It reduces the drying rate of drying cylinders
c) It increases the drying rate of drying cylinders
d) It causes the steam trap to air bind

Answer 107

b) It reduces the drying rate of drying cylinders

Question 108

In a mechanical steam trap, why is a float trap better at venting air than an inverted bucket trap?

a) A float can quickly adjust to the presence of air
b) A float is fitted with an automatic air vent
c) A float trap does not vent air better than bucket trap
d) The air vent orifice is adjustable on a float trap

Answer 108

b) A float is fitted with an automatic air vent

Question 109

Which of the following is not a qualification for an applicant for ME board examination?

a) A certified plant mechanic
b) At least 18 years old
c) A holder of BSME degree
d) A citizen of the Philippines

Answer 109

a) A certified plant mechanic

Question 110

A scriber is made from what steel?

A. Carbon steel
B. Cold rolled steel
C. Tool steel
D. Hot-rolled steel

Answer 110

C. Tool steel

Question 111

How do you call the mixtures or substances that are used in laboratory methods of producing a drop in temperature? The most common example is the mixture of ice and salt.

a) Calorific mixture
b) Water-ammonia mixture
c) Frigorific mixture
d) Hygroscopic mixture

Answer 111

c) Frigorific mixture

Question 112

What is the purpose of over temperature protection within the self-acting control system?

a) To protect the valve from high temperature steam
b) To protect the liquid fall in the capillary from boiling
c) To protect the control system from irreversible damage
d) To protect the application from overtemperature

Answer 112

c) To protect the control system from irreversible damage

Question 113

In performing a hydrostatic test on an existing power boiler, the required test pressure must be controlled so that it is not exceeded by more than:

a) 2%
b) 4%
c) 6%
d) 8%

Answer 113

a) 2%

Question 114

Statement that a given body is in static equilibrium means that the body cannot

a) have any type of motion
b) be acted upon by more than one force
c) undergo any displacement
d) have any type of acceleration

Answer 114

a) have any type of motion

Question 115

Superheated steam at a pressure of 6 bar g:

a) Has a larger Specifc heat capacity than water
b) Has a dryness fraction of 0.99
c) Must not be used as a heat transfer medium
d) Has a temperature greater than 165 oC

Answer 115

d) Has a temperature greater than 165 oC

Question 116

Name one characteristic feature of mechanical steam traps.

a) They pass condensate at steam temperature
b) They operate by sensing condensatet emperature
c) They can be fitted into any position
d) They are not affected by increasing back pressure

Answer 116

a) They pass condensate at steam temperature

Question 117

One of the two types of non-material nuclear radiation is:

a) Gamma radiation
b) Transmutation radiation
c) Walton radiation
d) Betatron radiation

Answer 117

a) Gamma radiation

Question 118

What is a body insulation that is usually described as a single equivalent uniform layer over the whole body?

a) Skin
b) Blood
c) Clothing
d) Water

Answer 118

c) Clothing

Question 119

Select the best conductor of electricity

A. Carbon
B. Silver
C. Copper
D. Iron

Answer 119

B. Silver

Question 120

The process of supplying or removing air by natural or mechanical means to or from any space.

a. ventilation
b. evaporation
c. air supply
d. natural convection

Answer 120

a. ventilation

Question 121

It is a boiler that has been inspected and declared unsafe to operate or disqualified, and marked indicating its rejection. How do you call this boiler?

a) Second hand boiler
b) Reinstalled boiler
c) Condemned boiler
d) Unfired boiler

Answer 121

c) Condemned boiler

Question 122

What do you call a fan in which the fluid is accelerated parallel to the fan axis?

a) Axial centrifugal fan
b) Mixed flow centrifugal fan
c) Radial centrifugal fan
d) Francis type fan

Answer 122

a) Axial centrifugal fan

Question 123

If the speed of a pump is higher than the designed speed, cavitation will

a. not occur
b. occur
c. may occur and may not occur
d. sometimes occur and sometimes not

Answer 123

b. occur

Question 124

The follower reciprocates or oscillates in a plane parallel to the axis of rotation.

a) cam curves
b) cylindrical cam
c) tangential cam
d) Radial cam

Answer 124

b) cylindrical cam

Question 125

It is a boiler removed from its original setting and re-erected at the same location. or erected at a location without change of ownership. How do you call this boiler?

a) Second hand boiler
b) Surplus boiler
c) Miniature boiler
d) Reinstalled boiler

Answer 125

d) Reinstalled boiler

Question 126

Kinematics pairs are those pairs that have

a) elements of pairs not held together mechanically
b) point or line contact between the elements when in motion
c) surface contact between the two elements when in motion
d) two elements that allow relative motion

Answer 126

d) two elements that allow relative motion

Question 127

In a refrigeration system, the heat absorbed in the evaporator per kg mass of refrigerant passing through:

a. equals the increase in enthalpy
b. is decreased if pre-cooler is used
c. does not depend on the refrigerant used
d. equals the increase in volume

Answer 127

a. equals the increase in enthalpy

Question 128

A plate, cylinder or other solid with a surface of contact so designed as to caused or modify the motion of the piece.

a) Cam
b) Disc
c) Gear
d) Pulley

Answer 128

a) Cam

Question 129

During engine operation, to vary the air quantity and also to vary the air fuel mixture, this is used to pen and closed the inlet manifold.

a) Throttle valve
b) Check valve
c) Choke valve
d) Gate valve

Answer 129

a) Throttle valve

Question 130

Which of the following is the one of the main purposes of refractory in a boiler furnace?

a) Help preheat the air for the furnace
b) Help preheat the feed water
c) Protect economizer from excessive heat
d) Prevent excessive furnace heat losses

Answer 130

c) Protect economizer from excessive heat

Question 131

A cam where the follower reciprocates or oscillates in a plane parallel to the axis of the cam is called:

a) circular cam
b) cylindrical cam
c) reciprocating cam
d) tangential cam

Answer 131

b) cylindrical cam

Question 132

In plotting the bHp versus speed in a wide- open throttle test for a spark ignition engine, the bHp curve:

a) is a Straight line.
b) tends to concave downward
c) has no characteristic shape
d) tends to concave upward

Answer 132

b) tends to concave downward

Question 133

Intrinsic silicon becomes extrinsically conductive, with electrons as majority carriers when adopted with which of the following?

A. Antimony
B. Boron
C. Germanium
D. Aluminum

Answer 133

A. Antimony

Question 134

Tidal power is the power generated from which of the following?

a) Waves of the ocean
b) Thermal energy of ocean water
c) Raw sea water
d) Rise and fall of tides

Answer 134

d) Rise and fall of tides

Question 135

An alloy of nickel and copper

A. Monel
B. Inconel
C. Titanium
D. Vanadium

Answer 135

A. Monel

Question 136

A thermo hydraulic feed water regulator is used to regulate the flow of water to a drum type boiler. The amount of water input to the boiler is controlled in proportion to the:

a) Boiler load
b) Setting of the feed pump relief valve
c) Amount of water in the outer tube that flashes into steam
d) Water level in the drum

Answer 136

d) Water level in the drum

Question 137

Which of the following contact point metals has highest melting point?

A. Silver
B. Tungsten
C. Gold
D. Copper

Answer 137

C. Gold

Question 138

The force when applied to a mass of one kilogram at an acceleration of one meter per second per second is:

a. Watt
b. Joule
c. Newton
d. Pascal

Answer 138

c. Newton

Question 139

A Carnot refrigerator operates between two reservoirs. One reservoir is at a higher temperature, T, and the other is at a cooler temperature, t. What is the coefficient of performance, COP, of the refrigerator?

a. T/t
b. 1-t/T
c. t/T-1
d. t/(T-1)

Answer 139

d. t/(T-1)

Question 140

A came with a roller follower would constitute which type of pair?

a) close pair
b) higher pair
c) lower pair
d) open pair

Answer 140

b) higher pair

Question 141

How do you call those substances that are particularly variable in the moisture content that they can possess at different times?

a) Wet materials
b) Hygroscopic materials
c) Gross materials
d) Bone-dry-weight material

Answer 141

b) Hygroscopic materials

Question 142

What can you say about entropy in the universe?

a) Entropy is always increasing
b) Entropy is decreasing
c) Entropy will zero at the end of time
d) Entropy is stagnating

Answer 142

a) Entropy is always increasing

Question 143

Upon entering the boiler room, you find the water out of the glass, the safety valve blowing off strong, and a fire under the boiler. Your first action would be to:

a) Remove the fire with draft and damper open
b) Cool the boiler down completely
c) Prevent priming by not raising the safety valve or making change in operating of engines or boiler
d) Cool the boiler down completely and prevent priming by not raising the safety valve

Answer 143

a) Remove the fire with draft and damper open

Question 144

Coriolis component of acceleration is found in

a) four bar mechanisms
b) mechanism of steam engine
c) higher pair
d) Whitworth-quick-return mechanism

Answer 144

d) Whitworth-quick-return mechanism

Question 145

What are the most commonly used materials as photo cathode for the photoelectric emission?

A. Barium and calcium
B. Cesium and rubidium
C. Arsenic and boron
D. Thorium and tungsten

Answer 145

C. Arsenic and boron

Question 146

How do you call a device that converts liquid refrigerant to vapor, with the held of the surrounding heat?

a) Condenser
b) Expansion valve
c) Compressor
d) Evaporator

Answer 146

d) Evaporator

Question 147

It is an upward force that is exerted on an object (like flat plate, airfoil, rotating cylinder, etc.) as the object passes through a fluid. What do you call this?

a) Drag
b) Lift
c) Aero horsepower
d) Terminal velocity

Answer 147

b) Lift

Question 148

It is a refrigeration system evaporator which is arranged with a with a tank or tank or a single drum (accumulator) located above the coil so that the inside of the evaporator is full of refrigerant. How do you call this type of evaporator?

a) Flooded evaporator
b) Dry evaporator
c) Cooing coil evaporator
d) Headered coil evaporator

Answer 148

a) Flooded evaporator

Question 149

Dielectric strength of a material depends on the material’s

A. Moisture content
B. Thickness
C. Temperature
D. All of these

Answer 149

D. All of these

Question 150

In a mechanical steam trap, what advantage does a bucket trap have over a float type?

a) It is able to withstand water hammer
b) It can be used on higher pressure
c) It can discharge air freely
d) It cannot lose its water seal

Answer 150

b) It can be used on higher pressure

Question 151

It is an increase in fluid pressure in a long pipe caused by a sudden velocity decrease, where the sudden decrease in velocity is caused by a valve closing.

a) Aero dynamics
b) Water hammer
c) Terminal velocity
d) Drag

Answer 151

b) Water hammer

Question 152

What is used to dry air?

a) A separator
b) A strainer
c) A steam traps
d) A tee pieces

Answer 152

a) A separator

Question 153

What is the pressure present inside the casing of an impulse turbine?

a. vacuum
b. atmospheric pressure
c. above atmospheric
d. zero

Answer 153

a. vacuum

Question 154

Space heat extraction rate Qex, Btu /h (W), is the rate at which heat is actually removed from the conditioned space by the air system. Its sensible heat rate component is equal to the sensible cooling load only when the space air temperature remains constant.

a) Space heat gain
b) Space cooling load
c) Space heating load
d) Space heat extraction rate

Answer 154

d) Space heat extraction rate

Question 155

These are materials with low coefficients of friction compared to metals, and they are used to reduce friction and wear in a variety of applications. There are a large number of such materials, and they include graphite, disulfide, molybdenum polytetrafluoroethylene, talc, graphite fluoride, polymers, and certain metal salts. How do you call these materials?

a) Greases
b) liquid lubricants
c) Solid lubricants
d) Powder lubricants

Answer 155

c) Solid lubricants

Question 156

In nickel-iron cell, the electrolyte is:

A. Dilute sulphuric acid
B. Dilute potassium hydroxide
C. Dilute sodium ammonium hydroxide
D. Dilute sodium chloride solution

Answer 156

B. Dilute potassium hydroxide

Question 157

Which of the following metals gets deposited to provide an undercut for chromium?

A. Copper
B. Silver
C. Bronze
D. Lead

Answer 157

C. Bronze

Question 158

The modulus of elasticity is a measure of

A. Stiffness
B. Toughness
C. Resilience
D. Hardness

Answer 158

A. Stiffness

Question 159

Which of the following is not a method of non-destructive testing of steel castings and forging?

A. Radiography
B. Magnetic particle
C. Ultrasonic
D. Chemical analysis

Answer 159

D. Chemical analysis

Question 160

A heat exchanger is designed to operate without waterlogging of the steam space. What is the usual choice of trap for its drainage?

a) Thermostatic trap
b) Inverted bucket trap
c) Thermodynamic trap
d) Float trap with thermostatic air vent

Answer 160

d) Float trap with thermostatic air vent

Question 161

In order to avoid cavitation in a centrifugal pump, which of the following is true?

a) Installation NPSH is greater than or equal pump NPSH
b) Installation NPSH less than or equal pump NPSH
c) Installation NPSH < pump NPSH
d) Installation NPSH should be negative

Answer 161

a) Installation NPSH is greater than or equal pump NPSH

Question 162

A material commonly used for shielding or screening magnetism

A. Brass
B. Copper
C. Aluminum
D. Soft iron

Answer 162

D. Soft iron

Question 163

If the discharge heads are far below the pump’s calibrated head at peak efficiency, cavitation will

a. not occur
b. occur
c. may occur and may not occur
d. sometimes occur and sometimes not

Answer 163

b. occur

Question 164

It is the motion of an object diminished/decreased speed.

a) Deceleration
b) Retarded motion
c) Negative impulse
d) All of these

Answer 164

b) Retarded motion

Question 165

Which of the following is an expression or equivalent of? horsepower per ton of refrigeration?

a) COP/ 4.715
b) 4.715/COP
c) COP x 4.715
d) 1/ (4.715 x COP)

Answer 165

b) 4.715/COP

Question 166

The chemical most commonly used to speed sedimentation of sewage is known as:

a) Lime
b) Copper sulfate
c) Sulfuric acid
d) Methylene blue

Answer 166

a) Lime

Question 167

What is the purpose of a bottom blowdown valve?

a) To control water level
b) To drain the boiler
c) To maintain TDS
d) To remove sludge

Answer 167

d) To remove sludge

Question 168

What is true about steam as it condenses?

a) It does so at constant entropy and temperature
b) It does so at constant enthalpy and reducing temperature
c) Both enthalpy and entropy reduce and temperature remains constant
d) Both enthalpy and entropy increase

Answer 168

c) Both enthalpy and entropy reduce and temperature remains constant

Question 169

It is a property of matter, which causes it to resist any change in its motion or state of rest.

a) Brake
b) Friction
c) Inertia
d) Impulse

Answer 169

c) Inertia

Question 170

If a particle of a link has a velocity that changes both in magnitude and direction at any instant, then

a) it must have only unidirectional acceleration
b) it must have two components of acceleration e.g., centripetal and tangential
c) it must have three components of acceleration e.g., centripetal, centrifugal and tangential
d) it must have three components of acceleration e.g., centripetal, centrifugal and gravitational

Answer 170

b) it must have two components of acceleration e.g., centripetal and tangential

Question 171

What is the effect on saturation temperature if the pressure of the fluid is increased?

a. saturation temperature increases
b. saturation temperature decreases
c. saturation temperature remains the same
d. there is no effect

Answer 171

a. saturation temperature increases

Question 172

A slider crank chain is made up of

a) one turning and one sliding pair
b) one turning and two sliding pairs
c) two turning and one sliding pair
d) three turning and one sliding pair

Answer 172

d) three turning and one sliding pair

Question 173

If the pressure exerted on a liquid is higher than the saturation pressure corresponding on its temperature, the liquid is at the __________ region.

a. saturated liquid
b. superheated liquid
c. subcooled liquid
d. highly superheated liquid

Answer 173

c. subcooled liquid

Question 174

How do you call the heating value of the fuel if the water in the products of combustion is in the liquid state?

a) Higher heating value
b) lower heating value
c) Proximate heating value
d) Gravimetric heating value

Answer 174

a) Higher heating value

Question 175

Why is a boiler feed tank heated to approximately 85degC?

a) To reduce the energy required to raise steam
b) To reduce the content of total dissolved solids in the water supplied to the boiler
c) To reduce the gas content of the water
d) To reduce the content of suspended solids in the water

Answer 175

c) To reduce the gas content of the water

Question 176

It is a humidity sensor used to measure relative humidity, dew point, or absolute humidity of ambient or moving air. This device could be mechanical or electronic. How do you call this?

a) Hydrometer
b) Hygrometer
c) Psychrometer
d) Barometer

Answer 176

b) Hygrometer

Question 177

In order to avoid cavitation, the NPSH of an installation should be at least than __________ the required NPSH of the pump.

a. equal or greater
b. equal or lower
c. lower
d. equal

Answer 177

a. equal or greater

Question 178

It corresponds to a heat absorption rate of 237.6 Btu/min (4.175 kW) with inlet an outlet pressures corresponding to saturation temperature of 23 oF (-5 oC) and 59 oF (15OC), respectively. How do you call this absorption rate?

a) American Unit of refrigeration
b) British Unit of refrigeration
c) European Unit of refrigeration
d) Standard Unit of refrigeration

Answer 178

b) British Unit of refrigeration

Question 179

It is the temperature at which the oil vapors will continue to burn when ignited.

a) Fire point
b) Flash point
c) Ignition temperature
d) Creep temperature

Answer 179

a) Fire point

Question 180

How often, as a minimum, should gauge glasses be tested?

a) Once a shift
b) Twice a day
c) Once a day
d) Once a week

Answer 180

c) Once a day

Question 181

For kinematics chains formed by lower pair the relation between the number of joint J is given by

a) L=2/3(J+2)
b) L = 3/2(J+2)
c) L = 2/3(L+2)
d) L = 3/2(L+2)

Answer 181

a) L=2/3(J+2)

Question 182

The best time to blow a boiler down is:

a) Once a day when the load is lightest
b) Once a day under full load
c) When the chemical concentration is greatest
d) Once a shift

Answer 182

c) When the chemical concentration is greatest

Question 183

Which of the following is not characteristic of superheated steam?

a) It contains no water droplets
b) It causes severe erosion in pipes
c) It may cause uneven heating of a product
d) It has a temperature greater than 165C

Answer 183

b) It causes severe erosion in pipes

Question 184

How do you compare superheated steam to that of saturated steam at the same pressure?

a) Contains more heat energy
b) Has a greater enthalpy of evaporation
c) Has a smaller specific volume
d) Condenses at a higher temperature

Answer 184

a) Contains more heat energy

Question 185

Involves the loss of ductility because of a physical or chemical change of the material is known as

A. Embrittlement
B. Pitting
C. Cold shortness
D. Decarburization

Answer 185

A. Embrittlement

Question 186

What are the main considerations for steam trap selection?

a) Price
b) Air venting, plant performance, flow capacity and reliability
c) Connections
d) The trap must be the same size as the condensate drain line

Answer 186

b) Air venting, plant performance, flow capacity and reliability

Question 187

you are assigned as Engineer, must be replaced. Which of the following types most likely to be installed?

a) Screw chiller
b) Scroll Chiller
c) Reciprocating chiller
d) Centrifugal chiller

Answer 187

d) Centrifugal chiller

Note: Centrifugal chillers are generally selected for their high coefficient of performance, good part-load performance, and cooling capacity. The economics of large-scale applications (such as hospital) generally favor more efficient machines such centrifugal chillers. In this case, a centrifugal chiller is also the only one of the types listed that can provide the needed capacity.

Question 188

It is one in which specimen, supported at both ends as a simple beam is broken by the impact strength of the metal

A. Charpy test
B. Izod test
C. Rockwell test
D. Universal test

Answer 188

A. Charpy test

Question 189

The standard capacity rating conditions for any refrigeration compressor is:

a) 50F, 19.6 psig for the suction 860F, 154.5 psig for the discharge
b) 50F, 9.6 psig for the suction 960F, 154.5 psig for the discharge
c) 100F, 9.6 psig for the suction 960F, 144.5 psig for the discharge
d) 50F, 19.6 psig for the suction 960F, 134.5 psig for the discharge

Answer 189

a) 50F, 19.6 psig for the suction 860F, 154.5 psig for the discharge

Question 190

The number of links in a pantograph is equal to

a) 3
b) 4
c) 5
d) 6

Answer 190

b) 4

Question 191

Which is the best trap to use when steam locking can occur?

a) An inverted bucket trap with an internal check valve mechanism
b) A balanced pressure steam trap
c) A float trap with automatic air vent
d) A float trap with steam lock release mechanism

Answer 191

b) A balanced pressure steam trap

Question 192

What is the effect on saturation pressure if the temperature of the fluid is increased?

a. there is no effect
b. saturation temperature increases
c. saturation temperature decreases
d. saturation temperature remains the same

Answer 192

b. saturation temperature increases

Question 193

It is the rate, in Btu/hr or W, at which heat is added to the conditioned air from the hot water, steam, or electric heating elements inside the coil.

a) Coil load
b) Heating coil load
c) Refrigerating load
d) Cooling load

Answer 193

b) Heating coil load

Question 194

It deals only with the motion of bodies without reference to the forces that cause them.

a) Kinetics
b) Motion
c) Kinematics
d) Acceleration

Answer 194

c) Kinematics

Question 195

Hygrometer is an instrument used to determine of which of the following?

a) Specific gravity of fluids
b) Specific gravity of gases
c) Specific gravity of liquids
d) Specific gravity of solids

Answer 195

a) Specific gravity of fluids

Question 196

Product of mass and linear velocity is known as:

a) Impulse
b) Linear momentum
c) Angular momentum
d) Impact

Answer 196

b) Linear momentum

Question 197

Steel that has been hammered rolled or drawn in the process of electricity

A. Wrought steel
B. Rimmed Steel
C. Killed steel
D. Stainless steel

Answer 197

A. Wrought steel

Question 198

A manufacturer claims that it has a COP of 2.0 when cooling a food at 5 oC using ambient air at 30 oC as a heat sink. Is the claim of the manufacturer valid?

a) Yes
b) No
c) Probably
d) It needs experimental verification

Answer 198

a) Yes

Note: Yes, because the claimed COP of the manufacturer is lower than the COP of Carnot Refrigeration

Question 199

At critical point of a pure substance, what is the value of latent heat?

a) Maximum
b) Minimum
c) Zero
d) Below zero

Answer 199

c) Zero

note: Zero, at the critical point hg-hf=0

Question 200

Which of the following types of portable fire extinguisher is recommended as most effective for putting out oil fires?

a) Pump tank type
b) Cartridge actuated type
c) Soda acid type
d) Foam type

Answer 200

d) Foam type

Question 201

Which of the following is other name for the liquid valve?

a) Freon valve
b) shut off valve
c) King valve
d) Master valve

Answer 201

c) King valve

Question 202

The capacity of a centrifugal pump, Q, is_________ proportional to the speed N in the same pump.

a. directly
b. indirectly
c. Inversely
d. inversely and indirectly

Answer 202

a. directly

Question 203

The A.S.M.E. Boiler code for boiler shells requires a tensile strength of which of the following, in psi?

a) 10000 to 20000
b) 25000 to 45000
c) 55000 to 63000
d) 70000 to 85000

Answer 203

c) 55000 to 63000

Question 204

It refers to a factor used in calculating the over- all heat transfer through the tube walls of a condenser tube or other heating surface. It includes the sum of the heat transfer rate of the layer of dirt and foreign material that builds up on the water side of the tube. What is this factor?

a) Cooling factor
b) Contact factor
c) By-pass factor
d) Fouling factor

Answer 204

d) Fouling factor

Question 205

Which of the following is/are the effects of cavitation?

a. pitting due to chemical reaction between gases and metal
b. noise accomplishing the collapse of the vapor bubbles
c. all of these
d. decreased in capacity and vibration of the pump

Answer 205

c. all of these

Question 206

What is the advantage of an internal water level control over an external one?

a) The external control is in a ‘dead’ area
b) It is less likely to scale up
c) It will respond more quickly to changes in water level
d) Daily testing of the level control chamber is not required

Answer 206

d) Daily testing of the level control chamber is not required

Question 207

What is the amount of heat energy required to raise the temperature of one pound of water one degree Fahrenheit? It is 1/180 of the heat required to raise the temperature of one pound of water from 32 to 212 oF at constant atmospheric pressure of 14,696 psi absolute.

a) Specifc heat
b) British thermal unit
c) Calorie
d) Sensible heat

Answer 207

b) British thermal unit

Question 208

It is a device commonly used to cool condenser water in Power and Refrigeration plants. The function of which is to reject heat to the atmosphere by reducing the temperature of water circulated through condenser or other heat rejection equipment. What is this device commonly called?

a) Condenser
b) Cooler
c) Cooling tower
d) Evaporator

Answer 208

c) Cooling tower

Question 209

Which of the following is the main purpose of the steam distribution manifold?

a) It replaces the need for a separator after the boiler
b) to remove air from the steam system
c) To provide an extra separating function
d) It is a requirement of the pressure systems regulations

Answer 209

c) To provide an extra separating function

Question 210

Which of the following forms soft scale or sludge?

a) Magnesium sulphate
b) Sodium carbonate
c) Sodium bicarbonate
d) Calcium bicarbonate

Answer 210

d) Calcium bicarbonate

Question 211

The size of the reciprocating pump is stamped on the builder’s plate as 3 x 4 x 6. The diameter of the liquid cylinder is:

a. 3 inches
b. 5 inches
c. 4 inches
d. 6 inches

Answer 211

c. 4 inches

Question 212

How do you call an opening where hot source of energy from the earth is harnessed?

a) Crater
b) Hot water source
c) Fumarole
d) Volcano opening

Answer 212

c) Fumarole

Question 213

Hart mechanism has how many links?

a) 4
b) 6
c) 8
d) 12

Answer 213

b) 6

Question 214

In accordance with recommended maintenance practice, thermostats used in a pneumatic temperature control system should be checked:

a) Weekly
b) Bi-monthly
c) Monthly
d) Once a year

Answer 214

d) Once a year

Question 215

The maximum allowable working pressure of a non-code steel or wrought iron heating boiler of welded construction shall not exceed to which of the following pressures?

a) 1 atmosphere
b) 1 Bar
c) 100 kPa
d) 2 gage pressures

Answer 215

b) 1 Bar

Question 216

What is the advantage of interruptible tariff?

a) Quick and easy to change to heavy fuel oil when required
b) Price of fuel
c) Price of interruptible gas lower than fixed supply
d) Convenience of supply

Answer 216

c) Price of interruptible gas lower than fixed supply

Question 217

If the net positive suction head (NPSH) is greater than the required suction head of the pump, cavitation will

a. not occur
b. occur
c. may occur and may not occur
d. sometimes occur and sometimes not

Answer 217

a. not occur

Question 218

Aluminum pistons are either cast or

A. Ground
B. Forged
C. Pressed
D. Welded

Answer 218

B. Forged

Question 219

What do you call a boiler of which both the location and ownership have been change after primary use?

a) Second hand boiler
b) Surplus boiler
c) Miniature boiler
d) Reinstalled boiler

Answer 219

a) Second hand boiler

Question 220

Continuity equation is applicable to which of the following?

a) Viscous and unviscous fluids
b) Compressibility fluids
c) Conservation of mass
d) Steady and unsteady flows

Answer 220

c) Conservation of mass

Question 221

The effect of a voltage variation to 90 percent of normal voltage, for a compound wound DC motor, of the full load current is:

a) Increase in the full load current approximately by 10%
b) Zero
c) A decrease in the full load current of approximately 10%
d) A decrease in the full load current 20%

Answer 221

a) Increase in the full load current approximately by 10%

Question 222

In accordance with the air pollution control code, no person shall cause or permit the emission of air contaminants from a boiler with a capacity of 500 million BTU sulfur dioxide content of more than:

a) 300 parts per million by volume undiluted emissions measured at 15 percent excess air
b) 200 parts per million by volume of undiluted emissions measured at 10 percent excess air
c) 200 parts per million by volume undiluted emissions measured at 15 percent excess
air
d) 300 per million by volume undiluted emissions measured at 10 percent excess air

Answer 222

b) 200 parts per million by volume of undiluted emissions measured at 10 percent excess air

Question 223

What are the main considerations for steam trap selection?

a) Price
b) Air venting, plant performance, flow capacity and reliability
c) Connections
d) The trap must be the same size as the condensate drain line

Answer 223

b) Air venting, plant performance, flow capacity and reliability

Question 224

A full-flow drier is usually recommended to be used in in a hermetic refrigeration compressor system to keep the system dry and to:

a) Prevent the products of decomposition from getting into the evaporator in the event of motor burn-out
b) Condense out liquid refrigerant during compressor off cycles and compressor start-up
c) Prevent the compressor unit form decreasing in capacity
d) Prevent the liquid from dumping into the compressor crank-case

Answer 224

a) Prevent the products of decomposition from getting into the evaporator in the event of motor burn-out

Question 225

What is the result of using a heat exchanger rating to calculate its steam consumption?

a) The true connected heat load may be different from the rated figure.
b) The rating does not take account of the temperature of the secondary medium
c) The rating is based on a steam pressure of 1.0 bar
d) The rating does not allow for condensate forming in the heat exchanger

Answer 225

a) The true connected heat load may be different from the rated figure.

Question 226

A kinematics chain needs a minimum of

a) 2 links and 2 turning pairs
b) 3 links and 3 turning pairs
c) 3 links and 2 turning pairs
d) 4 links and 4 turning pairs

Answer 226

d) 4 links and 4 turning pairs

Question 227

The direction of the __________ is toward the center of the circle in which, the study moves.

a) Centripetal acc.
b) Centrifugal acc.
c) Radial cam
d) Tangential

Answer 227

a) Centripetal acc.

Question 228

Which of the following is a type of water turbine where a jet of water is made to fall on the blades or buckets and due to the impulse of water the turbine starts moving?

a) Reaction turbine
b) Steam turbine
c) Francis turbine
d) Pelton wheel

Answer 228

d) Pelton wheel

Question 229

Why should strainers installed on steam lines be fitted on their sides?

a) To prevent the build-up of water in the strainer body
b) To trap more dirt
c) To reduce the frequency of cleaning
d) To provide maximum screening area for the steam

Answer 229

a) To prevent the build-up of water in the strainer body

Question 230

The ability of moving body to perform work is called:

a) Internal energy
b) potential energy
c) kinetic energy
d) flow work

Answer 230

c) kinetic energy

Question 231

installed, placed in operation but subject to annual inspection. What do you call this?

a) Miniature boiler
b) Existing installation
c) new boiler
d) Portable boiler

Answer 231

b) Existing installation

Question 232

Assume that you are checking the water level in a boiler which is on the line in a power plant. Upon opening the gage cocks, you determine that the water level was above the top gage cock. Of the following actions, the best one to take first in this situation would be to:

a) Shut-off the fuel and air supply
b) Surface-blow the boiler
c) Close the steam outlet valve from the boiler
d) Increase the speed of the feed water

Answer 232

c) Close the steam outlet valve from the boiler

Question 233

Progressive change in position of a body is called:

a) Acceleration
b) Motion
c) Force
d) Momentum

Answer 233

b) Motion

Question 234

If Hb is the pressure head corresponding to absolute pressure on the surface of the fluid, Z is the height of the fluid surface above or below the pump centerline, hf is the total friction head loss and Hv is the pressure head corresponding to the vapor pressure of the liquid. What is the available NPSH of the pump?

a. NPSH = Hb-Hv-Z + hf
b. NPSH = Hb-Hb-Z- hf
C. NPSH = Hb + Hv - Z-hf
d. NPSH = Hb + Hv - Z+hf

Answer 234

b. NPSH = Hb-Hb-Z- hf

Question 235

It is the tendency to fracture without appreciable deformation

A. Ductility
B. Brittleness
C. Malleability
D. Plasticity

Answer 235

B. Brittleness

Question 236

How do you call these engine oil additives used to help enable adequate low-temperature flow, at at high along with sufficient viscosity temperatures?

a) Viscosity-index improvers
b) Pour point dispersants
c) Oxidation inhibitors
d) Rust inhibitors

Answer 236

a) Viscosity-index improvers

Question 237

How does air enter a steam system?

a) Through joints, on shut down of the steam system
b) With make-up water to the boiler feed tank
c) With condensate entering the boiler feed tank
d) All items a, b, & c

Answer 237

d) All items a, b, & c

Question 238

Which of the following is a function of a steam nozzle?

a) Converts kinetic energy into heat energy
b) Changes internal energy into kinetic energy
c) Converts potential energy into heat energy
d) Changes enthalpic energy into kinetic
energy

Answer 238

d) Changes enthalpic energy into kinetic
energy

Question 239

Which of the following materials is used for making permanent magnets?

A. Carbon steel
B. Platinum cobalt
C. Alnico
D. All three mentioned

Answer 239

D. All three mentioned

Question 240

The effectiveness of a body as a thermal radiator at a given temperature:

a) Absorptivity
b) Emissivity
c) Conductivity
d) Reflectivity

Answer 240

b) Emissivity

Question 241

What is used in main condenser to control electrolysis?

A. Brass plate
B. Aluminum plates
C. Zinc plates
D. Bronze plate

Answer 241

C. Zinc plates

Question 242

The first step to take in planning a preventive maintenance program is to:

a) Replace all electric wiring
b) Make an equipment inventory
c) Replace all pump seals
d) Repair all equipment which is not in operation

Answer 242

b) Make an equipment inventory

Question 243

It is a measure of the lack of potential or quality of energy; and once that energy has been exchanged or converted, it cannot revert back to a higher level. What is this?

a) Specifc heat
b) Entropy
c) Internal energy
d) Molecular energy

Answer 243

b) Entropy

Question 244

All of the following statements about rusting of iron are correct, except:

A. Contact with water and oxygen are necessary for rusting to occur
B. Contact with a more electropositive metal reduces rusting
C. Halides aggravate rusting process which involves electrochemical oxidation reduction reaction
D. Pitting occurs in oxygen-rich anodic areas and the rust is deposited nearby

Answer 244

D. Pitting occurs in oxygen-rich anodic areas and the rust is deposited nearby

Question 245

It is a closed vessel in which steam or other vapor (to be used externally to itself) is generated by the direct application of heat used for power generation. How do you call this boiler?

a) Power boiler
b) Portable boiler
c) Oil-fired boiler
d) Miniature boiler

Answer 245

a) Power boiler

Question 246

What is the insulating value of clothing?

a) Btu unit
b) Clo units
c) Calorie unit
d) Frigorie Unit

Answer 246

b) Clo units

Question 247

A vector quantity that describes both how fast it is moving and the direction in which it is heated.

a) Acceleration
b) Displacement
c) Motion
d) Velocity

Answer 247

d) Velocity

Question 248

What is a heat exchanger that allows cross contact between two media? This heat exchanger allows the cooling water to flow by gravity over the outside of tubes or plates.

a) Single-pass heat exchanger
b) Double-pass heat exchanger
c) Baudelot heat exchanger
d) Shell-and-tube heat exchanger

Answer 248

c) Baudelot heat exchanger

Question 249

Fans used to withdraw air under suction, that is, the resistance to gas flow is imposed primarily upon the inlet.

a) Blowers
b) Exhauster
c) industrial fans
d) Domestic fans

Answer 249

b) Exhauster

Question 250

It is a closed vessel intended for use in heating water of for application of heat to generate steam or another vapor to be used externally from it. What do you call this pressure vessel?

a) Boiler or steam generator
b) Fired pressure vessel
c) Unfired pressure vessel
d) Pressurized tank

Answer 250

a) Boiler or steam generator

Question 251

It is an enclosed or partitioned space that is usually treated as a single load. If conditioned, it often has an individual control system. What is this?

a) Zone
b) Room
c) Space
d) Plenum

Answer 251

b) Room

Question 252

This is the condition in a geothermal plant wherein the ground surface where the drilled well is depressed or subsides due to depleting. What do you call this?

a) Ground subsidence
b) Thermal pollution
c) Chemical pollution
d) Dissolved solids

Answer 252

a) Ground subsidence

Question 253

It is important to take some moisture from the air to dehumidify it and the relative humidity reaches high levels. To do this, it requires cooling the air

a. at wet-bulb temperature
b. above its dew point temperature
c. at critical temperature
d. below its dew point temperature

Answer 253

d. below its dew point temperature

Question 254

Which of the following is the best conductor of electricity?

A. Graphite
B. China clay
C. Porcelain
D. Ceramics

Answer 254

A. Graphite

Question 255

The speed of sound is also called as:

a) Sound velocity
b) Acoustic velocity
c) Subsonic velocity
d) Critical velocity

Answer 255

b) Acoustic velocity

Question 256

In case of an elliptical trammel,

a) one pair turns and two pairs slide
b) two pairs and two pairs slide
c) three pairs turn and one pair slide
d) all four pairs turn

Answer 256

b) two pairs and two pairs slide

Question 257

The main advantage of operating a steam engine or steam turbine “condensing” is that it:

a) Increases the mean effective pressure in the prime mover
b) Decrease the condensate temperature
c) Permits the use of exhaust steam to drive auxiliary equipment
d) Eliminates the need for separating non- condensable from the steam

Answer 257

a) Increases the mean effective pressure in the prime mover

Question 258

How is flash steam produced?

a) From condensate passing from high to low pressure systems
b) From saturated steam
c) From superheated steam
d) From steam mixed with high temperature air

Answer 258

a) From condensate passing from high to low pressure systems

Question 259

Economical partial-load operation of steam turbines is obtained by minimizing throttling losses. This is accomplished by:

a) Reducing the boiler pressure and temperature
b) Throttling the steam flow into the uncontrolled set of nozzles
c) Dividing the first-stage nozzles into several groups and providing a steam control valve for each group
d) Controlling the fuel flow to the steam generator

Answer 259

c) Dividing the first-stage nozzles into several groups and providing a steam control valve for each group

Question 260

It is a boiler fuel created from the residue produced from crude petroleum after it has been distilled to produce lighter oils like gasoline, paraffin, kerosene, diesel or gas oil. What is this fuel?

a) Oil
b) Kerosene
c) Coke
d) Peat

Answer 260

a) Oil

Question 261

Klein’s construction is used to determine the

a) acceleration of various parts
b) angular acceleration of various parts
c) displacement of various parts
d) velocity of various parts

Answer 261

a) acceleration of various parts

Question 262

What is the standardized term used by the industry to describe any device that meters or regulates the flow of liquid refrigerant to an evaporator?

a) Refrigerant control
b) Expansion valve
c) Throttling valve
d) Capillary tube

Answer 262

b) Expansion valve

Question 263

What causes water hammer in the boiler?

a) Suspended water droplets
b) An air/water mixture
c) Strainers fitted on their sides
d) Slugs of water in the steam

Answer 263

d) Slugs of water in the steam

Question 264

If the velocity of mass is the same all the time during which motion takes place is called:

a) Deceleration
b) Uniform motion
c) Acceleration
d) None of these

Answer 264

b) Uniform motion

Question 265

The Klein’s method of construction for reciprocating engine mechanism

a) enables determined of Coriolis component
b) is a simplified form of instantaneous
center method
c) is based on acceleration diagram
d) utilizes a quadrilateral similar to the diagram of mechanism for reciprocating engine

Answer 265

d) utilizes a quadrilateral similar to the diagram of mechanism for reciprocating engine

Question 266

When the expansion or compression of gas takes place without transfer of heat t or from the gas, the process is called:

a) Reversible
b) Adiabatic
c) Polytrophic
d) Isothermal

Answer 266

b) Adiabatic

Question 267

An object thrown upward will return to earth the magnitude of the terminal velocity equal to

a) zero
b) one-half the initial velocity
c) twice the initial velocity
d) initial velocity

Answer 267

d) initial velocity

Question 268

The phenomenon of rising water in the tube of small diameter is called what?

a) Surface tension
b) Capillary rise
c) Water gage rise
d) Fluid column rise

Answer 268

b) Capillary rise

Question 269

In Refrigeration, how do you call a heat exchanger in which low-pressure refrigerant boils or vaporizes, thus absorbing heat that was removed from the refrigerated area by the cooling medium (water)?

a) Evaporator
b) Chiller
c) Cooler
d) Flooded Evaporator

Answer 269

b) Chiller

Question 270

What do you call a refrigeration system in which the refrigerant gas evolved in the evaporator is taken up in an absorber and released in a generator upon the application of heat?

a) Absorption refrigeration system
b) Cascade refrigeration system
c) Flooded refrigeration system
d) Steam jet refrigeration system

Answer 270

a) Absorption refrigeration system

Question 271

A magnet is able to attract

A. Iron, aluminum and brass
B. Iron, cobalt and zinc
C. Iron, copper and nickel
D. Nickel, cobalt and steel

Answer 271

D. Nickel, cobalt and steel

Question 272

Are steam traps required to pass air?

a) Steam traps should not pass air under any circumstances
b) Only when the trap has passed all the condensate
c) Air should be removed as soon as it reaches the trap
d) Only on high pressure steam system

Answer 272

c) Air should be removed as soon as it reaches the trap

Question 273

These are engine oil additives used to help keep the engine clean by solubilizing and dispersing sludge, soot, and deposit precursors. How do you call these oil additives?

a) Detergents
b) Dispersants
c) Oxidation inhibitors
d) Corrosion inhibitors

Answer 273

b) Dispersants

Question 274

When the velocity is changing, the acceleration is

a) constant
b) not constant
c) variable
d) zero

Answer 274

a) constant

Question 275

How do you call the material left after heating an oil under specified conditions at high temperature, and is useful as a quality control tool in the refining of viscous oils, particularly residual oils?

a) Ash
b) Color
c) Carbon residue
d) Coke

Answer 275

c) Carbon residue

Question 276

A process that the body uses to convert energy in food into heat and work, or it is the process that determines the rate at which energy is converted from chemical to thermal form within the body.

a) Metabolism
b) Eating
c) Body food processing
d) Blood circulation

Answer 276

a) Metabolism

Question 277

It is a device designed to control the flow of steam, water, gas, or other fluids. It can be considered a variable orifice positioned by an actuator in response to impulses or signals from the controller. It may be equipped with either a throttling plug, V-port, or rotating ball specially designed to provide a desired flow characteristic. How do you call this device?

a) Automatic Valve
b) Automatic flow meter
c) Thermostat
d) Pyrometer

Answer 277

a) Automatic Valve

Question 278

It is a bituminous coal that contains plenty of hydrocarbons, forming lumped masses when burned. This coal is ideal for forming carbonaceous gases for reduction of ore. What do you call this coal?

a) Coking or coking coal
b) Free burning coal
c) Peat coal
d) lignite coal

Answer 278

a) Coking or coking coal

Question 279

What is a frictional force that acts parallel but opposite to the direction of motion of fluid?

a) Drag
b) lift
c) Aero horsepower
d) Terminal velocity

Answer 279

a) Drag

Question 280

Commutator segments are made of

A. Zinc
B. Brass
C. Copper
D. Nickel

Answer 280

C. Copper

Question 281

What is the effect of CO2 in a steam system?

a) The formation of scale
b) The formation of sludge
c) Corrosion
d) Acidity

Answer 281

c) Corrosion

Question 282

How do you classify a solenoid valve?

a) A thermal valve
b) A magnetic stop valves
c) A bellows valves
d) A bi-metallic valve

Answer 282

a) A thermal valve

Question 283

It is a term indicating the measure of acidic components in oils; and was original intent to indicate the degree of refining in new oils, and to follow the development of oxidation in service, with its effects on deposit formation and corrosion. What is this?

a) Neutralization number
b) Total base number
c) Total acid number
d) Neutralization number and total acid number

Answer 283

d) Neutralization number and total acid number

Question 284

How do you call these engine oil additives used to prevent attack on iron and steel surfaces by condensed moisture and acidic corrosion products, aggravated by low-temperature stop- and-go operation?

a) Detergents
b) Dispersants
c) Oxidation inhibitors.
d) Rust inhibitors

Answer 284

d) Rust inhibitors

Question 285

It is the temperature to which oil has to be heated until sufficient flammable vapor is driven off to flash when brought into momentary contact with a flame. How do you call this temperature?

a) Fire point
b) Flash point
c) Ignition temperature
d) Creep temperature

Answer 285

b) Flash point

Question 286

Which of the following is a type of condenser?

a. shell-and-tube evaporator
b. evaporative
c. 3-phase motor
d. cooling tower

Answer 286

b. evaporative

Question 287

An Engineer claims to have created a heat engine that produces 15 kW of power for a 20 kW input while operating between energy reservoirs at 37degC and 400degC. Is the Engineer’s claim valid?

a) Valid
b) Not valid
c) Probably
d) May be valid

Answer 287

b) Not valid

Question 288

A heat exchanger has a design rating based on a working pressure of 7 bar g. What would be the effect of supplying the exchanger with steam at 3 bar g?

a) The heat output would be greater because the enthalpy of evaporation at 3 bar g is higher than at 7 bar g.
b) The heat output would be greater because steam at 3bar g has a greater volume than steam at 7 bar g.
c) less weight of steam would be required because steam at 3 bar g has a higher enthalpy of evaporation than 7 bar g.
d) The output would be reduced because the difference in temperature between the steam and product is reduced.

Answer 288

d) The output would be reduced because the difference in temperature between the steam and product is reduced.

Question 289

These oil additives are used to minimize wear under boundary lubrication conditions, such as cam and lifter, and cylinder-wall and piston- ring surfaces.

a) Anti-wear additives
b) Pour point dispersants
c) Oxidation inhibitors
d) Rust inhibitors

Answer 289

a) Anti-wear additives

Question 290

Name the principal cause of water-hammer?

a) Water particles suspended in steam
b) Water allowed to build up in pipes
c) Water droplets carried along the insides of pipes
d) Wet steam passing through steam traps

Answer 290

b) Water allowed to build up in pipes

Question 291

Compare the efficiency (COP) of a refrigeration cycle if the condensing
temperature is increased.

a. decrease in efficiency
b. increases in efficiency
c. efficiency remains the same
d. varies directly

Answer 291

a. decrease in efficiency

Question 292

The latent heat of heat of air is a function of dew point temperature and sensible heat is a function of the:

a. wet bulb temperature
b. critical point
c. dry bulb temperature
d. dew point temperature

Answer 292

c. dry bulb temperature

Question 293

What is a thermostat?

a) A temperature-operated switch
b) A pressure-operated switch
c) A superheat-operated switch
d) A back pressure-operated switch

Answer 293

d) A back pressure-operated switch

Question 294

If cavitation will occur, the available NPSH is insufficient. Which of the following is a remedy to overcome cavitation?

a. decrease the available NPSH
b. increase the required NPSH
c. increase the available NPSH
d. none of these

Answer 294

c. increase the available NPSH

Question 295

Generally, the material for thermocouple is

A. Chrome copel
B. Chrome alumei
C. Platinum rhodium
D. Any of these

Answer 295

D. Any of these

Question 296

It is a device that changes the magnitude, direction or mode of application of a torque or force while transmitting it for a particular purpose.

a) Frame
b) Machine
c) Mechanism
d) Structure

Answer 296

b) Machine

Question 297

It is the characteristic of exhibiting different properties when tested in different directions

A. Allotropy
B. Anisotropy
C. Isentropic
D. Isotropic

Answer 297

B. Anisotropy

Question 298

A pneumatic temperature control is used on the steam supply to a non-storage heat exchanger that heats water serving an office heating system. What is referred to as manipulated variable”?

a) The water being heated
b) The air signal from the controller to the valve actuator
c) The steam supplies
d) The temperature of the air being heated

Answer 298

b) The air signal from the controller to the valve actuator

Question 299

It is the generic term given to a family of solid fuels with high carbon content. How do you call this?

a) Solid fuel
b) Coal
c) Anthracite
d) Bituminous

Answer 299

b) Coal

Question 300

What is the molecular attraction of layers of an unlike matter?

a) Adhesion
b) Cohesion
c) Advection
d) Convection

Answer 300

a) Adhesion

Question 301

Which of the following is a scale of temperature in which the melting point of ice is taken as 0 o and the boiling point of water is 800?

a) Reaumur Scale
b) Carrene Scale
c) Genetron Scale
d) Frigorie Scale

Answer 301

a) Reaumur Scale

Question 302

The heat rejected by the working substance to the regenerator in the Stirling cycle is:

a) Equal to the heat absorbed by the working substance from the regenerator
b) Not equal to the heat absorbed by the working substance from the regenerator
c) Dependent on the value of temperature in the heat addition process
d) Measured during the constant temperature heat rejection process

Answer 302

a) Equal to the heat absorbed by the working substance from the regenerator

Question 303

The ratio of its radiating power to that of a black body at same temperature.

a) Transmissivity
b) Reflectivity
c) Absorptivity
d) Emissivity

Answer 303

d) Emissivity

Question 304

What is the effect of superheating the suction vapor with regards to the work of compressor per unit mass of refrigerant circulated?

a. Decreases
b. remains the same
c. proportional
d. increases

Answer 304

d. increases

Question 305

To protect adequately the engine bearings, what type and better arrangement of lubricating oil filter is most practical?

a) Full flow type filter installed between the lubricating oil pump and bearings
b) Splash lubricating system in the crank case
c) Duplex filter installed before the lubricating pump
d) Bypass filter with cleanable and replaceable elements

Answer 305

a) Full flow type filter installed between the lubricating oil pump and bearings

Question 306

Assume that one of your assistances was near the Freon 11 refrigeration system when a liquid Freon line ruptured. Some of the liquid Freon 11 has gotten into your assistant’s right eye. Of the following actions, the one which you should not take is to:

a) Immediately call for an eye doctor specialist (medical doctor)
b) Gently and quickly rub the Freon 11 out of the eye
c) Uses a boric-acid solution to clean out the Freon 11 from his eye
d) Wash the eye by gently blowing the Freon 11 out of his eye with air

Answer 306

b) Gently and quickly rub the Freon 11 out of the eye

Question 307

Which of the following parameters has the greatest? limiting effect on the thermal performance of an open, evaporative cooling tower?

a) Wet-Bulb temperature
b) Dry-Bulb temperature
c)Range
d) Approach

Answer 307

a) Wet-Bulb temperature

Question 308

The pitch point on a cam refers to

a) any point on pitch curve
b) a point at a distance equal to pitch circle radius from the center
c) the point of cam pitch circle that has the maximum pressure angle
d) none of the above

Answer 308

c) the point of cam pitch circle that has the maximum pressure angle

Question 309

It is dust removal equipment that consists of a cylindrical tank structure provided with a tangential opening at one end for gas passage and a spray manifold at the center which is made of a vertical pipe attached with spray nozzles where water is introduced at the bottom of this spray pipe. The gas revolves around the cylindrical body as it enters the scrubber, and comes in contact with the water spray, the dust fly ash is then wetted and hence separated from the gas leaves the scrubber at the top.

a) Cinder trap or catcher
b) Cyclonic Spray Scrubber
c) Cyclone Separator
d) Electrostatic Precipitator

Answer 309

b) Cyclonic Spray Scrubber

Question 310

It represents the loss due to mechanical friction of the moving parts of the engine, and expressed as horsepower. How do you call this?

a) Indicated Hp
b) Brake Hp
c) Combined Hp
d) Friction Hp

Answer 310

d) Friction Hp

Question 311

The linear portion of the stress-strain diagram of steel is known as the:

A. Modulus of elasticity
B. Plasticity
C. Irreversible range
D. Elastic range

Answer 311

D. Elastic range

Question 312

In proximate analysis, the coal analysis is consisting of moisture content, fixed carbon. ash, and which of the following?

a) Sulfur
b) Hydrogen
c) Nitrogen
d) Volatile matter

Answer 312

d) Volatile matter

Question 313

In a Brayton cycle or gas turbine cycle, what do you call the heat exchanger that passes exhaust heat to the compressed air, prior to combustion?

a) Reheater
b) Recuperator
c) Heater
d) Heat exchanger

Answer 313

b) Recuperator

Question 314

What is the recommended weight of the machine foundation?

a) 3 to 5 times the machine weight
b) 4 to 6 times the machine weight
c) 2 to 4 times the machine weight
d) 2 to 4 times the machine weight

Answer 314

a) 3 to 5 times the machine weight

Question 315

At what pressure should a boiler safety valve be set?

a) Maximum working pressure
b) Normal working pressure
c) Hydraulic test pressure
d) Feed pump maximum pressure

Answer 315

a) Maximum working pressure

Question 316

Can temperature-controlled applications be trapped?

a) Traps should not be fitted under any circumstances
b) Only if there is no lift after the trap
c) If the pressure on the trap is always higher than backpressure
d.) Pumps should always be fitted to remove condensate

Answer 316

c) If the pressure on the trap is always higher than backpressure

Question 317

Which of the following is not a primary cess?

A. Carbon zinc
B. Silver oxide
C. Silver zinc
D. Nickel – cadmium

Answer 317

C. Silver zinc

Question 318

In a thermal plant, name the components of a self-acting temperature control system.

a) Control valve and actuator
b) Control valve, actuator and sensor
c) Control valve, actuator, capillary tube and sensor
d) Control valve, actuator and capillary tube

Answer 318

c) Control valve, actuator, capillary tube and sensor

Question 319

You are supervising the installation of a steam-driven reciprocating pump. The pump’s air chamber is missing and you have to replace it with one of several salvaged ones. The salvaged air chamber selected should have a volume equal to, most nearly,

a) Half of the position displacement of the pump
b) 11⁄2 times the position displacement of the pump
c) 2 times the piston displacement of the pump
d) 2 1⁄2 times the piston displacement of the pump

Answer 319

d) 2 1⁄2 times the piston displacement of the pump

Question 320

The process applied to iron pipe, which retards corrosion

A. Galvanizing
B. Annealing
C. Soldering
D. Tinning

Answer 320

A. Galvanizing

Question 321

Priming of a boiler is:

a) Getting a boiler prepared for start-up
b) A reduction in boiler pressure and carryover of water
c) Occurrence of excessive TDS and carryover of water
d) Balancing of boilers in a multi-boiler installation

Answer 321

c) Occurrence of excessive TDS and carryover of water

Question 322

A cone formed by elements, which are perpendicular to the elements of the pitch cone at the large end.

a) cone distance
b) back cone
c) root cone
d) cone center

Answer 322

b) back cone

Question 323

A published ‘U’ value from a steam coil to a water-based solution is given as 550 1300 W/m^2-degC. When would be figure near the lower end of the range be used?

a) When the steam is known to be of good quality
b) For short coils
c) For small diameter coils
d) When scaling or fouling of the coil takes place

Answer 323

d) When scaling or fouling of the coil takes place

Question 324

The efficiency of a riveted joint is defined as the ratio of the:

a) Plate thickness to the rivet diameter
b) Strength the riveted joint to the strength of a welded joint
c) Strength of the riveted joint to the strength of the solid plate
d) Number of rivets in the first row of the joint to the total number of rivets on one side of the joint

Answer 324

c) Strength of the riveted joint to the strength of the solid plate

Question 325

Refrigeration condensers are rated based upon their ability to reject the total heat that comes from which of the following?

a) Compressor work and net refrigeration effect
b) Superheating
c) Subcooling
d) Compressor work

Answer 325

a) Compressor work and net refrigeration effect

Question 326

This is a type of dryer that consists of a vertical shaft in which the wet feed is introduced at the top and falls downward over baffles while coming in contact with the hot air that rises and exhaust at the top. This dryer is used for drying palay, wheat, and grains.

a) Rotary dryer
b) Hearth dryer
c) Tower dryer
d) Tray dryer

Answer 326

c) Tower dryer

Question 327

Of the following, the main purpose of a sub- cooler in a refrigerant piping system for a two-stage system is to:

a) Reduce the total power requirements and total heat rejection to the second stage
b) Reduce the total power requirements and return oil to the compressor
c) Improve the flow of evaporator gas per ton and increase the temperature
d) Increase the heat rejection per ton and avoid system shutdown

Answer 327

a) Reduce the total power requirements and total heat rejection to the second stage

Question 328

Aging at moderately elevated temperature expedites the process and

A. Natural aging
B. Artificial aging
C. Normal aging
D. Supernatural aging

Answer 328

B. Artificial aging

Question 329

Which of the following improves red hardness?

A. Boron
B. Cobalt
C. Copper
D. Columbium

Answer 329

B. Cobalt

Question 330

What is a device, used in refrigeration system, having a predetermined temperature fusible member for the relief of pressures?

a) Fusible valve
b) Stop valve
c) Check valve
d) Relief valve

Answer 330

a) Fusible valve

Question 331

The material used for commutator brushes is mostly

A. Copper
B. Mica
C. Carbon
D. Cast iron

Answer 331

C. Carbon

Question 332

In large refrigeration systems, the usual location for charging the refrigeration system is into the:

a) Suction line
b) Liquid line between the receiver shut-off valve and the expansion valve
c) line between the condenser and the compressor
d) line between the high-pressure cut-off switch and the expansion valve

Answer 332

b) Liquid line between the receiver shut-off valve and the expansion valve

Question 333

What will happen when the pressure at any point in a centrifugal pump goes below the vapor pressure corresponding to the temperature of the liquid?

a. turbulent flow
b. laminar flow
c. cavitation
d. priming

Answer 333

c. cavitation

Question 334

In elliptical trammels,

a) all four pairs are turning
b) one pair turning and three pairs sliding
c) three pairs turning and one pair sliding
d) two pairs and two pairs sliding

Answer 334

d) two pairs and two pairs sliding

Question 335

It is an engine in which the connecting rod is directly connected to the piston wristpin. The side thrust caused by the angularity of the connecting rod is taken by the piston bearing against the cylinder wall.

a) Opposed-piston engine
b) Trunk piston engine
c) Crosshead engine
d) 2-stroke engine

Answer 335

b) Trunk piston engine

Question 336

How do you call these engine oil additives used to prevent attack on sensitive bearing metals?

a) Detergents
b) Dispersants
c) Oxidation inhibitors.
d) Corrosion inhibitors

Answer 336

d) Corrosion inhibitors

Question 337

If Eg is the enthalpy of saturated vapor and Ef is the enthalpy of the saturated liquid. What is the expression for the heat of vaporization?

a. Eg
b. Eg – Ef
c. Ef
d. Ef/Eg

Answer 337

b. Eg – Ef

Question 338

Gas produced by the combustion of fuel oil and cannot be found in the flue gases is:

a) Carbon dioxide
b) Hydrogen
c) Oxygen
d) Nitrogen

Answer 338

b) Hydrogen

Question 339

Steel that has been deoxidized with strong deoxidizing agent such as silicon or aluminum, in order to eliminate the reaction between the carbon and oxygen during solidification

A. Carbon steel
B. Tool steel
C. Killed steel
D. Structural steel

Answer 339

C. Killed steel

Question 340

Generally, steam turbines in power station operate at which of the following speeds?

a) 3000 rpm
b) 1000 rpm
c) 4000 rpm
d) 500 rpm

Answer 340

c) 4000 rpm

Question 341

Ice cubes were added to a glass of water and stirred. Moisture stars to condense at the outer surface of the glass, what is the temperature of the moisture at the outer surface?

a. critical temperature
b. surface temperature
c. dew point temperature
d. saturation temperature

Answer 341

c. dew point temperature

Question 342

Those substance that are particularly variable in the moisture content that they can possess at different times.

a) Wet materials
b) Hygroscopic materials
c) Gross materials
d) Bone-dry-weight material

Answer 342

b) Hygroscopic materials

Question 343

Cam in general maybe divided into two classes; uniform motion and ________ motion cam.

a) Reverse
b) gravity
c) decelerated
d) accelerated

Answer 343

d) accelerated

Question 344

In order to avoid cavitation in a centrifugal pump, which of the following is true?

a) Installation NPSH ≥ pump NPSH
b) Installation NPSH ≤ pump NPSH
c) Installation NPSH < pump NPSH
d) Installation NPSH should be negative

Answer 344

a) Installation NPSH ≥ pump NPSH

Question 345

What is the disadvantage of heating a tank by direct steam injection?

a) It agitates the solution
b) Some of the enthalpy of water is used
c) Steam traps are not required
d) It dilutes the tank content

Answer 345

d) It dilutes the tank content

Question 346

Regardless of its rotative speed, the value of the specific speed of a given impeller of a centrifugal pump is:

a. Varying
b. constant
c. unity
d. increasing

Answer 346

b. constant

Question 347

It is the ratio of the amount of heat taken up by a substance to the temperature at which the substance exists. How do you call this?

a) Internal energy
b) Flow energy
c) Enthalpy
d) Entropy

Answer 347

d) Entropy

Question 348

Which of the following types of packing would be used on steam points?

A. Asbestos
B. Neoprene
C. Metallic
D. A or C

Answer 348

D. A or C

Question 349

It is a bituminous coal that contains plenty of hydrocarbons, forming lumped masses when burned. This coal is ideal for forming carbonaceous gases for reduction of ore. What do you call this coal?

a) Coking or coking coal
b) Free burning coal
c) Peat coal
d) lignite coal

Answer 349

a) Coking or coking coal

Question 350

What is the purpose of testing gauge glasses?

a) To ensure the gauge cocks are operative
b) To ensure there is sufficient water over the top fire tube
c) To ensure the boiler water level is being properly sensed
d) To check the boiler 1st and 2nd low water level alarms

Answer 350

a) To ensure the gauge cocks are operative

Question 351

The refrigerant control that guards the compressor from overloading brought about by an increased loads in the evaporator due to defrosting, warm products and others is called:

a. safety valve
b. suction valve
c. solenoid valve
d. expansion valve

Answer 351

d. expansion valve

Question 352

Balance pressure traps are what type of steam trap?

a) Thermodynamic
b) Mechanical
c) Thermostatic
d) They do not belong to any specific type of trap family

Answer 352

b) Mechanical

Question 353

Temporary hardness salts are reduced by:

a) Raising the water temperature
b) lowering the water temperature
c) Raising the pH value
d) letting the water settle

Answer 353

a) Raising the water temperature

Question 354

Select the one that is the highest pair.

a) Crosby indicator mechanism
b) Hart’s straight-line mechanism
c) Thomson indicator mechanism
d) Both gearing mechanism

Answer 354

d) Both gearing mechanism

Question 355

The color of a lubricating oil is obtained by reference to transmitted light; the color by reflected light is referred to as:

a) Bloom
b) Reflection
c) Deflection
d) Residue

Answer 355

a) Bloom

Question 356

Imperfections within metallic crystal structures may be all of the following. EXCEPT:

A. Lattice vacancies or extra interstitial atom
B. Ion pairs missing in ionic crystals
C. Displacement of atoms of interstitial sites
D. Linear defects or slippage dislocations caused by shear

Answer 356

B. Ion pairs missing in ionic crystals

Question 357

The second law of thermodynamics says that whenever energy is exchanged or converted from one form to another, the potential for energy to do work will be

a) Decreased
b) Increased
c) Zero
d) Stagnant

Answer 357

a) Decreased

Question 358

Manganese is an alloy of

A. Copper, manganese and nickel
B. Copper, aluminum and chromium
C. Copper, zinc and lead
D. Copper, chromium and cadmium

Answer 358

A. Copper, manganese and nickel

Question 359

It is an internal combustion engine wherein the ignition of the fuel is not accomplished solely by the heat developed from the compression of the combustion air supplied but partly or entirely by other heat sources, such as an uncooled tube, plate, bulb or an electric resistance coil.

a) Spark-ignition engine
b) Compression-ignition engine
c) Surface-ignition engine
d) Dual combustion engine

Answer 359

c) Surface-ignition engine

Question 360

These are engine oil additives used to prevent or reduce deposits and corrosion by neutralizing combustion byproduct acids. What are these additives?

a) Detergents
b) Dispersants
c) Oxidation inhibitors
d) Corrosion inhibitors

Answer 360

a) Detergents

Question 361

Why are three-port self-acting control valves used in an industrial steam of a thermal system?

a) To mix or divert liquids especially water
b) To dump steam to waste under fault conditions
c) Where cooling applications are required
d) When large valves are required to meet large capacities

Answer 361

a) To mix or divert liquids especially water

Question 362

Two kilogram of gas is confined in a 1m^3 tank 200kpa and 88degC. What type of gas is in the tank?

a). Helium
b). Ethane
c). Methane
d). Ethane

Answer 362

b). Ethane

Question 363

The process of treating air so as to control simultaneously its temperature, humidity, cleanliness and distribution to meet the requirements of the conditioned space.

a. Refrigeration
b. air conditioning
c. ducting system
d. air mixing

Answer 363

b. air conditioning

Question 364

What is the effect of temperature on calcium and magnesium sulphates?

a) They separate out as soft scale and sludge
b) They precipitate out solution and form hard scale
c) Foaming and carryover occurs
d) The TDS is increased

Answer 364

b) They precipitate out solution and form hard scale

Question 365

The cam angle is

a) the angle subtended by live portion of cam at the cam’s center
b) the angle of rotation of the cam for a definite displacement of the follower
c) the angle subtended at the cam’s center by the portion of cam during which the follower moves
d) the angle subtended by the cam at the cam center when the follower dwells

Answer 365

b) the angle of rotation of the cam for a definite displacement of the follower

Question 366

The total number of instantaneous centers for a mechanism of N links is equal to

a) 2N
b) (N-1) (N+1)
c) 2N(N-1)
d) N(N-1)/2

Answer 366

d) N(N-1)/2

Question 367

It is the rate, in Btu/hr or W, at which heat must be removed from a conditioned space so as to maintain a constant temperature and acceptable relative humidity. Its sensible load component is equal to the sum of the convective heat transfer from the surfaces of the building envelope, furnishings, occupants, appliances, and equipment. How do you call this?

a) Space heat gain
b) Space cooling load
c) Space heating load
d) Space heat extraction rate

Answer 367

b) Space cooling load

Question 368

What is the treatment for scale forming salts in boiler feedwater?

a) They are chemically treated to modify the pH
b) The feedwater tank is raised to at least 85OC
c) They are chemically treated to produce suspended solids
d) They are removed by filtration means

Answer 368

c) They are chemically treated to produce suspended solids

Question 369

Which of the following is a primary cell?

A. Mercury – oxide
B. Lead – acid
C. Nickel-iron – alkaline
D. Nickel – cadmium – alkaline

Answer 369

A. Mercury – oxide

Question 370

In gas compressor, when the volumetric efficiency increases, the piston displacement has:

a) Not been changed
b) Been decreased
c) Been increased
d) Been insufficient data

Answer 370

b) Been decreased

Question 371

What can you say about the velocity of fluid at the center of the pipe section?

a) Maximum
b) Minimum
c) Average
d) Zero

Answer 371

a) Maximum

Question 372

The capacity of a centrifugal pump, Q, is ________ proportional to the impeller diameter D at the same pump.

a. directly
b. indirectly
c. inversely
d. inversely and indirectly

Answer 372

a. directly

Question 373

It is a space, or several rooms, or units of space having some sort of coincident loads or similar operating characteristics. It may or may not be an enclosed space, or it may consist of many partitioned rooms. How do you call this?

a) Zone
b) Room
c) Space
d) Plenum

Answer 373

a) Zone

Question 374

The process of obtaining the resultant of any number of vectors.

a) Scalar quantity
b) Vector composition
c) Vector quantity
d) Vector resolution

Answer 374

b) Vector composition

Question 375

In air conditioning, it indicates either a volume or a site without a partition or a partitioned room or group of rooms. How do you call this?

a) Zone
b) Room
c) Space
d) Plenum

Answer 375

c) Space

Question 376

Cavitation is a phenomenon, which occurs in a __________ pump only.

a. centrifugal
b. rotary
c. reciprocating
d. centrifugal and reciprocating

Answer 376

a. centrifugal