ISHRAE- IEM Students’ Chapter

Sample Question Bank for TAAPMAAN QUIZ 2016- Technical

INSTRUCTIONS: 1. THE CORRECT ANSWER OF EACH QUESTION IS INDICATED IN BOLD LETTERS.

2. ANSWERS MARKED IN RED COLOUR ARE CONTRADICTORY ANSWERS AND ARE NEEDED TO BE REVIEWED
BY OWN

1. Which of the following is a mixture of two or more refrigerants that have the same boiling point and act as one refrigerant?
A. An azeotrope
B. A ternary blend
C. A zeotropic
D. A near azeotropic.

2.The parameter used by ASME to define fans, blowers and compressors is

A. Fan ratio
B. Blade ratio
C. Specific ratio
D. Twist ratio
3.What principle do roped elevators work on?
A. Friction
B. Traction
C. Hope
D. Pressure

4.What would be the impact to the muscle tissue if a person is exposed to the vacuum of space?
A. Wild, non stop convulsions
B. The muscles would bulge and you would look like Arnold Schwarzenegger
C. Total paralysis, followed by convulsions and a return to paralysis
D. The muscles would shrink to the size of Kate Moss's

5.The device used to cool the refrigerant in a vapour absorption chiller is a

a. Vacuum pump
b. Vacuum condenser
c. Condenser
d. None of the above

6.The electric unit of power is the watt, named after James Watt. What did Watt invent?
A. Heat pump
B. Neon light
C. Letter copying press
D. Chronometer

7.Unlike the ice storage system, however, the Phase Change Material systems can be used with any conventional water
________ for a new or alternatively retrofit application.
a. Chiller
b. HVAC
c. District heating
d. Air conditioner

8.Phase Change Materials have been used since the late 1800s as a medium for the ________ applications.
a. Compressed-air energy storage
b. Energy storage
c. Thermal energy storage
d. Ammonia

ISHRAE IEM STUDENTS’ CHAPTER Page 1

9.Since boiling point and gas density are affected by ________, refrigerants may be made more suitable for a particular
application by choice of operating _______.
a. Temperature
b. Force
c. Pressure
d. Pressure measurement

10.Early mechanical refrigeration systems employed ________ gas or anhydrous ammonia, with small home refrigerators
primarily using the former.
a. Sulfuric acid
b. Acetic acid
c. Sulfur dioxide
d. Hydrogen sulfide

11.What is the condition of a three phase motor that is single phasing?

A Motor rotation is reversed
B Motor operates only on two legs of power
C Single phase motor is substituted
D Used for starting only

12.How much higher is locked rotor current than running current for most motors?
A 1½ to 2 times
B 2 to 2½ times
C 3 to 5 times
D 10 to 15times

13.Reciprocating compressors are:

A Immune to possible damage from liquid slugs
B Limited in capacity to approximately 15Tons
C Should not be used for low-temperature applications
D Used for all types of high/medium/low temperature applications

14.What is the vital part of all boilers?

a. The lowest part of the steam and water drum.
b. The first part of the boiler which becomes over heated due to the lowering water level.
c. The secondary super heater tubes.
d. The water wall headers.

15.Relating to boilers, what is foaming?

a. Where foaming air bubbles do not raise to the surface of the water level.
b. When the boiler external insulation becomes inefficient through softening.
c. Air bubbles accumulate in the feed water system causing the feed pump to cavitate.
d. The process where boiling water steam bubbles do not burst

16.What is a fire tube boiler?

a. A boiler which has the fire and hot gases within the tubes.
b. A boiler in which it is easier to control the firing.
c. A boiler which is hotter than all others.
d. A boiler which is only fired using wood.

17.What is the basic purpose of superheaters in a boiler?

a. To increase the steam pressure.
b. To increase the temperature of the steam.
c. Preheat feed water.
d. Increase saturation temperature of the steam.

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18.The space police patrol has been travelling about an hour without encountering trouble; it's definitely a slow stretch.
Officer Ganpat, driving now, decides to engage cruise control; the ship is now moving at a constant velocity of 0.6 c relative
to the road. What phenomenon do the officers experience? Their ship has no artificial gravity
s experience? Their ship has no artificial gravity.
a. 6 G of force
b. Weightlessness
c. Gravitational lensing
d. Quantum tunneling

19.Space Police Officer Sripad, looking out a window, notices another ship running a red light. The officers immediately turn
on their siren and pull the ship over. The pilot protests saying: " I was moving at relativistic speeds toward the light, so the
red light was Doppler-shifted to green. I didn't know it was supposed to be red!" Is this a reasonable argument?
A. No. If you're moving towards a light, it will be red-shifted, not blue-shifted, so the traffic light should not have appeared
green.
B. Yes. An observer moving toward a red light at just over 0.1 c will see it as green.
C. No. The Doppler effect only applies to sound, not to light.
D. No. An observer would have to be moving faster than the speed of light for a red light to be Doppler-shifted to green, and
that's physically impossible!

20.In centrifugal pumps, the impeller diameter can be reduced to about ______ of the maximum size:
a. 25%
b. 50%
c. 75%
d. None of the above

21.The function of the volute in a centrifugal pump is to:

a. Impart a radial and rotary motion to the liquid
b. Collect the liquid coming from the impeller and gradually reduce its velocity
c. Direct incoming liquid to the impeller
d. Provide a small running clearance between the impeller and pump casing

22.All of the following are steps that can be taken to stop pump cavitation EXCEPT:
a. Increase the pressure at the suction of the pump
b. Increase head losses in the pump suction piping
c. Reduce the flow rate through the pump
d. Reduce the speed of the pump impeller

23.The process of the formation and subsequent collapse of vapour bubbles in a pump is called:
a. Cavitation
b. Gas binding
c. Deadheading
d. Pump run-out

24.The approximate percentage reduction in power consumption with 1 °C rise in evaporator temperature in refrigerating
systems is
a. 1%
b. 3%
c. 2%
d. 4%

25.A mechanical refrigeration system experiences the least wear and tear when is:
a. Receives the least possible load but is not shut down.
b. Runs continuously.
c. Cycles as often as possible
d. Is oversized

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26.A typical evaporator operating temperature in an air-conditioning system is___
a. 40F
b. 55F
c. 75F
d. 200F

27.Which of the following is true about suction gas lines?

a. Under-sizing and oversizing are bad, but under-sizing tends to be the least damaging of the two.
b. Under-sizing and oversizing are bad, but over-sizing tends to be the least damaging of the two errors
c. Under-sizing these lines produces no serious operating difficulty
d. Over-sizing these lines produces no serious operating difficulty.

28.Carbon monoxide reduces the ability of the:

A. Blood to carry oxygen to the body issues
B. White blood cells to actively regenerate as needed
C. Body to sleep as needed
D. None of the above

29.Radon is a:
A. Colourless gas, formed by radioactive decay of radium
B. Colourless, pungent gas, formed by radioactive decay of radium/ uranium
C. Colourless, odourless gas, formed by radioactive decay of radium/uranium

30.Select the most common method(s) of capacity control for rotary compressors
a. Cylinder unloading
b. Discharge vanes
c. Motor speed control
d. Inlet vanes
e. On-off cycling

31.In a scroll compressor, about how many orbits will the movable scroll need to make to completely compress one chamber
of refrigerant gas?
a. 1
b. 2 to 2½
c. 3 to 3½
d. 4
e. None of these, it doesn’t work that way

32.Since 2005, Japan has tried to reduce office air conditioning through its Cool Biz campaign, in which workers are
encouraged to dress light and informally. The need to save energy is even more urgent in the wake of the 2011 earthquake
and tsunami. What’s the minimum office temperature in what is now known as Japan’s "Super" Cool Biz program?
a. 68º F (20º C)
b. 72º F (22º C)
c. 78º F (25.5º C)
d. 82º F (28º C)

33.Turning on the air conditioner reduces the fuel economy of a conventional gasoline engine by about 20 percent,
according to U.S. Environmental Protection Agency testing. What happens when you use the air conditioner in a hybrid gas-
electric vehicle?
a. It has about the same impact
b. There is less loss of gas mileage
c. There is a greater loss of gas mileage
d. There is no impact on gas mileage

34.If you have unused rooms in your house, how can you save money on central air conditioning?
a. Close the air conditioner registers in the unused rooms and close the doors

ISHRAE IEM STUDENTS’ CHAPTER Page 4

b. Open the windows in unused rooms to increase air circulation
c. Add window air conditioners to the unused rooms, and run them only when the room is occupied
d. Keep registers open in the unused room, and use a programmable thermostat to set back air conditioning at
night or when no one is in the house

35.The Term ‘In Phase’ means:

a. It is the additive relationship between multiple sound waves.
b. When two sound waves occur at the same time and add together. The resultant wave is twice the amplitude.
c. Lowest frequency an instrument can produce, known as the "1st Harmonic".
d. It is the term for Sound wave reflected off a surface

36.In acoustic parlance, what is ‘Attack’

a) Time to peak volume
b) Length of sound
c) How sound travels
d) Periodic variations in atmospheric pressure

37.What is a ‘Fundamental’
A. The combinations of multiple frequencies that make up a sound
B. lowest frequency an instrument can produce, known as the "1st Harmonic"
C A visual model of sound's amplitude over time
D. The change in pressure (volume).

38.Which friction is a maximum before movement and then zero?

A. Kinetic friction
B. Static friction
C. Viscous friction
D. Skin friction

39.What happens if a servo that has no damping is subjected to a step input?

A. It will keep overshooting
B. It will oscillate about the demanded position
C. It will undershoot
D. It will come to the demanded position right away

40.Which friction increases its opposition when velocity increases?

A. Coulomb friction
B. Static friction
C. Viscous friction
D. Kinetic friction
41.State the name given for the time it takes for an exponential growth output to reach 63.2 % of its steady state value
A. Time constant
B. Coulomb’s constant
C. Critical time
D. Fourier’s time constant
42.Glass is a liquid, true or false?
A True
B False
43.Two identical glasses of fresh water are at room temperature. In the first glass dissolve two teaspoons of salt. Then take
two identical ice cubes and put them in the glasses (one in each). Which ice cube will be completely melted first?
A One with fresh water
B One with salt water

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44.The condition indicating the direction of electron flow is known as
A Current direction
B Voltage direction
C Flux condition
D Polarity

45.Cavitation will take place if the pressure of the fluid flowing at any point is
A. More than the vapour pressure of the fluid.
B. Equal to the vapour pressure of the fluid.
C. Less than the vapour pressure of the fluid.
D. None of the above.
46.A room thermostat should be mounted
A. Four feet from the floor
B Near a supply air grille for accuracy
C On an outside wall
D Near the return air grille
47.Why would nitrogen be used when brazing?
A It eliminates the use of flux
B It eliminates copper oxidation
C It makes better stronger joints
D All of the above
48.When using a clamp on ammeter, a wire is coiled 10 times and the clamp on ammeter is placed around the coil of a wire.
What effect, if any, will this have on the ampere reading?
A. The amperage will not be affected
B The amperage will multiply by 10
C The amperage will divide by 10
D The amperage will change depending on where the coil of wire is placed
49.I am drinking a nice glass of ice water, and my ice keeps getting smaller and smaller. It is so magical! Which law of
thermodynamics (which involves entropy) will explain the ice getting smaller?
A 1st Law
B 2nd Law
C 3rd Law
D 0th Law
50.Purging is a term which describes _____________
A leakage of refrigerant into the atmosphere
B removing unwanted air, vapours, dirt or moisture from a system
C removing excess dirt from the atmosphere
D adding refrigerant to a system
51.A tight nut or bolt may be loosened safely by __________
A soaking the threads with penetrating oil
B heating it
C tapping it lightly with a hammer
D Any of the above
52.What is used to measure the pressure drop across an air filter?
A a water gauge manometer
B a mercury gauge manometer
C an anemometer
D a velometer
53.If a relay is not operating, which of the following is not the proper initial procedure?
A Replacing the relay
B Checking the motor

ISHRAE IEM STUDENTS’ CHAPTER Page 6

C Checking the capacitor and overload cut-out
D Checking the thermostat
54.After jumping out of a plane (which one of my friends recently did), a sky-diver will eventually reach their terminal velocity.
Which of these is the most accurate description of terminal velocity?
A Constant velocity
B Uniform deceleration
C Uniform acceleration
D Zero velocity
55.Which component of a dehumidifier is often used to reheat the air after moisture is removed?
A Evaporator
B Chiller
C Condenser
D Compressor
56.Which of the following characteristics applies to thermoelectric refrigeration?
A System is complicated and hard to service
B System is not very efficient
C System requires a large charge of refrigerant
D Refrigerant charge must be carefully measured
57.Why is the pressure increased in the car tires after driving it?
A Air molecules break up to form separate atoms
B The speed of the air molecules increases
C Air molecules expand
D The speed of the air molecules increases
58.Soldered metal must be _____________ when soldering
A about 11500 F
B hot enough to anneal the metal
C hot enough to make the solder fully liquid
D hot enough to drive the water out of the flux
59.A double cut file is a file
A with teeth on both sides
B that has no safe edge
C that cuts on both the forward & backward strokes
D with teeth in two directions
60.What causes the earth's magnetic field?
A The earth's liquid iron core sloshing around as it spins.
B Electric eels swimming in the Pacific Ocean.
C Mountain of iron at the North Pole.
D Mountain of iron at the South Pole.

61.Which creature can survive being frozen and defrosted?

A Wood frog
B Shrimps
C Cockroach
D Snail

62.The Universe has cooled since the Big Bang leaving space at what temperature?
A 1million degrees centigrade
B 1400 degrees centigrade
C 0 degree centigrade
D -270 degrees centigrade

ISHRAE IEM STUDENTS’ CHAPTER Page 7

63. Spontaneous combustion happens when the heat produced from oxidation is enough to ignite the substance without a
spark. For which of the following is there no scientific proof for the occurrence of spontaneous combustion?
A Oily rags
B Newspapers
C Humans
D Green Hay

64. Which of the following items can best be called Biodegradable?

A Polystyrene cups
B Phosphate detergents
C Cellulose
D Aluminum

65. Which of the following properties make water indispensable to life as we know it?
A Water expanding at temperatures below 4C
B Water at a constant high dielectric
C Water with extremely high surface tension
D All these

66. The human body, while typing, generates:

A 750BTU/hr
B 500BTU/hr
C 250BTU/hr

67. The human body, while walking level, generates

A 750BTU/hr
B 500BTU/hr
C 250BTU/hr

68. The human body, walking downstairs, generates:

A 1500BTU/hr
B 4400BTU/hr
C 6300BTU/hr

69. The human body, walking upstairs, generates

A 1500BTU/hr
B 4400BTU/hr
C 6300BTU/hr

70. When installing a remote condensing unit that will be located outdoors, it is necessary to install a crankcase heater on
the compressor to:
A Prevent migration of liquid refrigerant in oil
B Keep the oil viscosity low for good lubrication
C Prevent ice formation on compressor
D Prevent sludging of oil

71. What is the purpose of a suction line accumulator?

A To prevent liquid flood-back
B To protect the compressor from liquid flood-back
C To control refrigerant flow into the evaporator
D To stop condenser flood-back

72. Fin spacing on low temperature evaporator is ________ on medium temperature evaporator
A The same as
B Closer together than

ISHRAE IEM STUDENTS’ CHAPTER Page 8

C Farther apart than
D None of the above

73. An air-conditioning system is pumped down and the power is switched off. If the suction pressure rises rapidly, this is an
indication that the:
A System is overcharged
B System has a restriction in the refrigerant line
C Suction valve is bad
D Discharge valve is bad

74. Which of the following will not cause a high discharge pressure?
A Dirty evaporator
B Dirty condenser
C Burned out condenser fan
D Air in the system

75. If the outlet valve of a receiver is shut off (assuming an operating compressor), the:
A High pressure control will stop the system
B Unit will shut down
C Suction pressure will decrease
D Valve and/or gaskets will break on the compressor
(assume the unit has a correctly sized receiver and a proper refrigerant charge).

76. If the load on a compressor increases, suction:

A Pressure will decrease and discharge pressure will increase
B Pressure will increase and discharge pressure will decrease
C and discharge pressure will increase
D and discharge pressure will decrease

77. The principle reason for drawing a deep vacuum on a refrigeration system is to:
A Lower the head pressure
B Remove refrigerant in the system
C Remove air
D Remove moisture

78.Upon entering the condenser, the hot gas discharge first gives up its:
A Specific Heat
B Latent Heat
C Superheat
D Vaporization

79. As an oil becomes more diluted with refrigerant, its viscosity:

A Increases
B Decreases
C Remains the same
D None of the above

80.The shell and tube type water cooled condenser

A. Has the refrigerant in the tubes, and water flows over the tubes inside of the shell
B. Has sub-cooled refrigerant leaving the tubes and superheated gas entering the tubes
C. Has the refrigerant in the shell, and water flows through the tubes located inside the shell
D. Can have refrigerant or water flowing inside of the tubes

81. What are the effects of mineral and scale deposits on the inside of a water cooled condenser?
A. It causes the high-side pressure to decrease and a decrease of water flow
B. It causes the high-side pressure to increase and a decrease of water flow
C. It causes the leaving water temperature to decrease and an increase of water flow
D. It causes an increase of water flow and high-pressure

ISHRAE IEM STUDENTS’ CHAPTER Page 9

82. What two factors affect the efficiency of a water-cooled condenser?
A.The high side pressure of the condenser and the inlet water temperature
B.The high side pressure of the condenser and the outlet water temperature
C.The quantity of water and the temperature difference between the refrigerant and the water
D.The quantity of water and the refrigerant condensing point compared to the boiling point of water

83. The counter-flow principle is

A. Where the cooler water is in contact with the cooler refrigerant liquid and the warmer water is in contact with the
hot gas
B. Where the warmer water is in contact with the cooler refrigerant liquid and the cooler water is in contact with the hot gas
C. Where the hot gas refrigerant meets the cool municipal water at its inlet
D. Where the sub-cooled refrigerant meets the leaving water at its outlet

84. What is the common temperature difference from the air entering a condenser and the refrigerant condensing
temperature?
A. 10F
B. 20F
C. 30F
D. 35F

85. What two factors affect the efficiency of a water-cooled condenser?

A.The high side pressure of the condenser and the inlet water temperature
B.The high side pressure of the condenser and the outlet water temperature
C.The quantity of water and the temperature difference between the refrigerant and the water
D.The quantity of water and the refrigerant condensing point compared to the boiling point of water

86. If air is trapped inside a condenser coil, what symptoms would be present?
A. High discharge pressure, low amperage and a decrease of efficiency
B. Low discharge pressure, high amperage and excessive heat build-up
C. A decrease in efficiency, a decrease of heat build-up and high amperage
D. An increase in heat build-up, high amperage and high discharge pressure

87. CFCs neither dissolve in water nor break down into compounds that dissolve in water, so that they do not rain out of the
atmosphere.

A.True

B. False

88. Ozone may be described as

a. A harmful gas
b. A harmless gas
c. Similar to radon gas
d. A protective gas that shields the earth

89.The principal impurity removed by an activated carbon filter is:

a. Carbon monoxide
b. moisture
c. Solid particles and odour-causing gases and bacteria
d. All of the above

90. Ultraviolet rays are used to ________

a. Kill bacteria and mold
b. Kill viruses
c. Remove odours from ducts and duct air
d. All of the above

ISHRAE IEM STUDENTS’ CHAPTER Page 10

91. Building related contaminants usually peak in the _____
a. Morning
b. Night
c. Afternoon
d. Evenings

92. A split system condensing unit contains

A. The compressor, condenser and metering device
B. The condenser, compressor and service valves
C. The condenser, service valves and metering device
D. The condenser, evaporator and service valves

93. What is the common temperature difference from the air entering a condenser and the refrigerant condensing
temperature?
A. 5 to 10F
B. 10 to 15F
C. 20 to 30F
D. 35 to 45F

94. What section of the condenser coil is most likely to become dirty on a unit that has a side air discharge with fan pushing
air over the coil?
A. The outside of the coil
B. The top section of the coil
C. The inside of the coil
D. The bottom section of the coil

95. Where in the system is the excess superheat added that must be removed before condensation in the condenser can
take place?
A. At the beginning of the evaporator and at the end of the receiver
B. At the end of the receiver and at the beginning of the thermostatic expansion valve
C. At the beginning of the evaporator and in the compressor
D. At the end of the evaporator and in the compressor

96. ______ is the cause of more than half of IAQ (Indoor Air Quality) complaints:
a. Radon
b. Asbestos
c. Bio aerosols
d. Inadequate ventilation

97. The rate that formaldehyde gas is released in a home is directly proportional to:
a. Increase in RH & Decrease in Temperature
b. Decrease in RH & Increase in Temperature
c. Decrease in RH & Decrease in Temperature
d. Increase in RH & Increase in Temperature

98. Medium density fibre-board (MDF) and particle board used in commercial & residential premises is a common source of
which indoor contaminant?
a. Formaldehyde
b. Nitric acid
c. Carbon monoxide
d. Excessive CO2

99. What is a VOC (volatile organic compound)

a. A highly evaporative chemical that gives off gases
b. A chemical that stays a liquid and has a high boiling point

ISHRAE IEM STUDENTS’ CHAPTER Page 11

c. A solid compound that is commonly found on the ground
d. None of the above

100. To make for easier assembly, the Tata Nano’s body panels are not welded together. Instead, they are:
a. Taped together
b. Glued together
c. Stitched together
d. Attached with Velcro

101. World is consuming oil at what rate?

a. 1000 barrels a day
b. 1000 barrels an hour
c. 1000 barrels a minute
d. 1000 barrels a second

102. The engineers behind the Tata Nano had a lot to do to decrease weight and cost. Which of the following did they not
do?
a. Use one windscreen wiper (instead of two)
b. Leave out radio and air-conditioning
c. Replace heavy glass windows with plastic ones
d. Use tires without tubes

103. Ford plans to increase fuel efficiency by doing what to each and every car?
a. Drill micro holes in the frame to reduce drag
b. Make them “aerodynamic” by painting accent stripes
c. Install weaker air-conditioning that uses less energy
d. Remove 110 to 340 kilograms from every car

104. When Rajendra K Pachauri, co-winner of 2007 Nobel Peace Prize, said, “before we unleash this kind of animal on the
streets of India, we ought to explore the public-transportation options?” what was he talking about?
a. New improved and cheaper version of the rickshaw.
b. The Tata Nano
c. Faster, more powerful mopeds
d. Genetically engineered cows

105.Dr. Willis Carrier did not invent which of the following?

A. Rational Psychrometric Formula
B. Centrifugal Chiller
C. Residential Air-conditioning
D. Variable Air Volume Box (VAV)

106. When compared to standard motors, energy efficient motors have

A. Lower Slip
B. Lower shaft speed
C. Higher starting torque
D. All of the above

107. What is the power factor for electrical loads having only incandescent lamps?

Ans. As the load is almost a purely resistive load hence the power factor is 1.

108. An induction motor rated for 7.5 kW and 90 % efficiency, operating at full load, will
A. Deliver 8.33 kW
B. Deliver 7.5 kW
C. Draw 7.5 kW
D. Draw 6.75 kW

ISHRAE IEM STUDENTS’ CHAPTER Page 12

109. The power factor of an induction motor:

A. Increases with decrease in percentage motor loading

B. Decreases with decrease in percentage motor loading
C. Remains constant at all the percentage motor loading
D. None of the above

110. In automobiles the power is transmitted from gear box to differential through
A. universal joint
B. bevel gear
C. Hooke's joint
D. Knuckle joint

111.The basic law of heat conduction is called

A. Kirchoff's law
B. Fourier's law
C. Stefan's law
D. Newton law of cooling

112. Heat transfer takes place according to

A. Second law of thermodynamics
B. Fourier's Law
C. Zeroth law of thermodynamics
D. First law of thermodynamics

113. The elastic stress strain behaviour of rubber is

A. Linear
B. Unpredictable
C. Plastic
D. Non-linear

114. Slow plastic deformation of metals under a constant stress is known as

A. Plastic deformation
B. Creep
C. Endurance
D. Fatigue

115. The ability of a material to resist softening at high temperature is known as

A. Fatigue
B. Creep
C. Hot hardness
D. Hot tempering

116. Resilience of a material is important, when it is subjected to

A. Combined loading of stress & strain
B. Shock Loading
C. Wear and Tear
D. Thermal Stresses

117. Rankine's theory of failure is applicable for following type of materials

A. Plastic
B. Ductile
C. Brittle
D. Elastic

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118. Guest's theory of failure is applicable for following type of materials
A. Brittle
B. Plastic
C. Ductile
D. Elastic

119. Expansion in a nozzle is an

A. Isobaric process
B. Adiabatic process
C. Isentropic process
D. Isochoric process

120. A hollow shaft of same cross sectional area as solid shaft transmits
A. Same torque
B. More torque
C. Depends on the external diameter
D. Less torque

121. An indication of ignition quality of diesel fuel is given by

A. Octane number
B. Cetane number
C Detonation
D Pre-ignition

122. The process in which higher hydrocarbons are decomposed into smaller hydrocarbons is called
A. Cracking
B. Polymerization
C. Reforming
D. Alkylation

123. The steel used for rails under heavy traffic and on sharp curves is
A. Cast steel
B. Manganese steel
C. Mild steel
D. Chrome steel

124. Corrosion resistance of stainless steel is due to

A. Carbon
B. Sulphur
C. Chromium
D. Vanadium

125. Which material will have highest limiting strength?

A. Mild steel
B. Aluminium
C. Wrought iron
D. Cast iron
126. The conduction of heat from a hot body to a cold body is an example of
A. Reversible process
B. Internal energy
C. Irreversible process
D. Entropy process
127. Following relationship defines the Gibbs free energy G
A. F = U -TS
B. G = U+TS
C. G = H -TS
D. G = H+TS

ISHRAE IEM STUDENTS’ CHAPTER Page 14

128. Zeroth law of thermodynamics
A. Deals with reversibility and irreversibility of process
B. Deals with conversion of mass and energy
C. Deals with heat engines
D. States that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each
other

129. The internal energy of a system is a function of only

A. pressure
B. volume
C. temperature
D. volume and pressure

130.Power available at the shaft of an I.C engine is known is

A. Net indicated horse power
B. Pumping power
C. Indicated horse power
D. Brake horse power

131.The efficiency of a lifting machine is the ratio of

A. Output to the input
B. Work done by the machine to the work done one the machine
C. Mechanical advantage to the velocity ratio
D. All of the above

132.Co-efficient of friction depends upon

A. Area of contact only
B. Nature of surface only
C. Both A and B
D. None of the above

133.The ratio of static friction to dynamic friction is always

A. Less than one
B. equal to one
C. none of these
D. greater than one

134.The motion transmitted between the teeth of gears in mesh is

A. Rolling
B. Sliding
C. Rotary
D. Partly sliding and partly rolling

135.A simple mechanism has

A. 4 Links
B. 2 Links
C. 3 Links
D. 1 Link

136. In milk chilling plants, the usual secondary refrigerant is

a. Ammonia solution
b. Sodium Silicate
c. Glycol

ISHRAE IEM STUDENTS’ CHAPTER Page 15

 d. Brine

137. The leakage in a Freon – based refrigeration system can be detected by using an
a. Oxy-acetylene torch
b. Halide torch
c. Sulphur torch
d. Blue litmus paper

138. For large tonnage (more than 200 tons) air – conditioning application, which one of
the following types of compressor is recommended
a. Reciprocating
b. Rotating
c. Centrifugal
d. Screw
139. Problem encountered in using R-22 in domestic refrigerator is

a. Low efficiency
b. Use of large capacity of compressor
c. Increase demand for lubrication
d. Frequent burnout of winding

140. Which one eco- friendly refrigerant out of the following is used in many domestic and
car air- conditioners nowadays .
a. R- 22
b. R-113
c. R-123
d. R-134a

141. The cooling system used for supersonic aircrafts and rocket is
a. Simple air cooling system
b. Boot-strap air cooling system
c. Reduced ambient air cooling system
d. Regenerative air cooling system

142. The cooling system used for supersonic aircrafts and rocket is
e. Simple air cooling system
f. Boot-strap air cooling system
g. Reduced ambient air cooling system
Regenerative air cooling system

ISHRAE IEM STUDENTS’ CHAPTER Page 16

…………………….

Name the company which is marketing their brand with Slogan

1. Engineering Tomorrow- Danfoss Group, Nordborg, Denmark- Refrigeration, air

conditioning, the control of electric motors, the heating of buildings, solutions for
renewable energy such as solar power and heat pumps.
2. Inspire the Next- Hitachi, Tokyo, Japan- Urban Planning and Development Systems
Company, Defense Systems Company, Information & Telecommunication Systems
Company , Energy Solutions Company
3. Life's Good- LG
4. Higher quality of Indoor Living- Zamil Air Conditioners India Private Limited, ZAC
India
5. Nobody cools better- Blu Star- AC Products/ Segment
6. Building Value in Air-Greenheck India Pvt Ltd

…….…………………

1. LEED- Leadership in Energy and Environmental Design- (LEED) is a set of rating

systems for the design, construction, operation, and maintenance of green buildings,
homes, and neighborhoods.

2. AEEE- Alliance for an Energy efficient Economy

3. FSAI- Fire & Security Association of india
4. ISLE- Indian Society of Lighting Engineers
5. IGBC- Indian Green Building Council
6. CIBSE- Chartered Institution of Building Services Engineers

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ISHRAE IEM STUDENTS’ CHAPTER Page 17