Caro Practice Exam
1. Which of these is equivalent to 150 PSIA?
A. 164.7 PSIG
B. 185.0 PSIG
C. 135.3 PSIG
D. 121.7 PSIG: C
2. What is the volume of a cold storage room that is 150' long, 80' wide and
35' high?
A. 12,000 cubic feet
B. 219,000 cubic feet
C. 392,000 cubic feet
D. 420,000 cubic feet: D
3. What is required to move heat from one object to another?
A. Change of state
B. Heat of fusion
C. Latent heat
D. Temperature difference: D
4. What does temperature indicate?
A. The quantity of heat energy in an object
B. Intensity of heat energy in an object
C. Latent heat energy of an object
D. The pressure of a vapor: B
5. How much heat must be removed to convert 5 pounds of water that is at
32°F to ice at 20°F?
Q2 =mcÅΔÅT
Where:
Q2 = heat removed (BTUs) m =
mass of the ice (in pounds)
c = specific heat of ice (approximately 0.5 BTU/lb°F)
Delta TΔ = change in temperature (final temperature - initial temperature): 750 btu
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,Caro Practice Exam
6. Which of these is required to obtain a valid reading from a
pressure/temperature chart?
A. The refrigerant must be in a saturated condition.
B. The refrigerant must be in a superheated condition.
C. The refrigerant must be at a constant temperature.
D. The refrigerant must be in a sub-cooled condition.: A
7. What does the term "compression ratio" refer to?
A. The ratio of piston length to piston diameter
B. The ratio of discharge pressure to suction pressure in PSIA
C. The ratio of discharge pressure to suction pressure in PSIG
D. The ratio of suction gas volume to discharge gas volume: B
8. Which of these is an essential component of a mechanical refrigeration
system?
A. Accumulator
B. Receiver
C. Thermostat
D. Expansion device: D
9. What is a function of the compressor in a mechanical refrigeration system?
A. To pump liquid to the expansion device
B. To accept vapor from the evaporator and compress it to increase its pressure and
temperature
C. To remove vapor from the condenser and send it to the receiver
D. To remove liquid from the evaporator: B
10. Which of these accurately describes sub-cooled liquid?
A.
Liquid at -20°F
B.
Liquid at 95°F
C.
Liquid cooled below its saturation pressure
D.
Liquid returning from the condenser: C
11. Which refrigerant is more forgiving to moisture in a refrigeration system?
A. R-507
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1. Which of these is equivalent to 150 PSIA?
A. 164.7 PSIG
B. 185.0 PSIG
C. 135.3 PSIG
D. 121.7 PSIG: C
2. What is the volume of a cold storage room that is 150' long, 80' wide and
35' high?
A. 12,000 cubic feet
B. 219,000 cubic feet
C. 392,000 cubic feet
D. 420,000 cubic feet: D
3. What is required to move heat from one object to another?
A. Change of state
B. Heat of fusion
C. Latent heat
D. Temperature difference: D
4. What does temperature indicate?
A. The quantity of heat energy in an object
B. Intensity of heat energy in an object
C. Latent heat energy of an object
D. The pressure of a vapor: B
5. How much heat must be removed to convert 5 pounds of water that is at
32°F to ice at 20°F?
Q2 =mcÅΔÅT
Where:
Q2 = heat removed (BTUs) m =
mass of the ice (in pounds)
c = specific heat of ice (approximately 0.5 BTU/lb°F)
Delta TΔ = change in temperature (final temperature - initial temperature): 750 btu
1/7
,Caro Practice Exam
6. Which of these is required to obtain a valid reading from a
pressure/temperature chart?
A. The refrigerant must be in a saturated condition.
B. The refrigerant must be in a superheated condition.
C. The refrigerant must be at a constant temperature.
D. The refrigerant must be in a sub-cooled condition.: A
7. What does the term "compression ratio" refer to?
A. The ratio of piston length to piston diameter
B. The ratio of discharge pressure to suction pressure in PSIA
C. The ratio of discharge pressure to suction pressure in PSIG
D. The ratio of suction gas volume to discharge gas volume: B
8. Which of these is an essential component of a mechanical refrigeration
system?
A. Accumulator
B. Receiver
C. Thermostat
D. Expansion device: D
9. What is a function of the compressor in a mechanical refrigeration system?
A. To pump liquid to the expansion device
B. To accept vapor from the evaporator and compress it to increase its pressure and
temperature
C. To remove vapor from the condenser and send it to the receiver
D. To remove liquid from the evaporator: B
10. Which of these accurately describes sub-cooled liquid?
A.
Liquid at -20°F
B.
Liquid at 95°F
C.
Liquid cooled below its saturation pressure
D.
Liquid returning from the condenser: C
11. Which refrigerant is more forgiving to moisture in a refrigeration system?
A. R-507
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