Refrigeration/RETA Exam Test Questions
Which refrigerant in table 3-2 would operate at the lowest suction
pressure with an evaporator temperature of 10 degrees Fahrenheit?
A. R-717
B. R-507
C. R-404a
D. R-134a -Correct Answer ✔ ✔ D. R-134a
What is the freezing point of water?
A. -32 degrees Fahrenheit.
B. 32 degrees Celsius.
C. 32 degrees Fahrenheit.
D. 0 degrees Fahrenheit. -Correct Answer ✔ ✔ C. 32 degrees
Fahrenheit
,Chapter 2 - Refrigeration Cycle Study Questions
If a liquid below is saturation temperature, what is its condition?
A. Superheated.
B. Subcooled.
C. Saturated.
D. Vaporized. -Correct Answer ✔ ✔ B. Subcooled.
Why does the refrigerant in the condenser change state from vapor to
liquid?
A. The pressure is decreased by the compressor.
B. The refrigerant runs down into the receiver.
C. The refrigerant loses heat energy to the surrounding environment.
,D. The fans increase the pressure to above saturation. -Correct
Answer ✔ ✔ C. The refrigerant loses heat energy to the
surrounding environment.
Which items does the expansion valve control?
A. The flow of liquid into the evaporator.
B. The pressure in the evaporator.
C. The pressure in the receiver.
D. The system operating pressure. -Correct Answer ✔ ✔ A. The
flow of liquid into the evaporator.
Which of the following statement is true?
A. 10 psia is a greater pressure than 10 psig.
B. 10 psig is equal to 10 psia.
C. 10 psig is a greater pressure than 10 psia.
, D. 10 psig and 10 psia use different scales and therefore cannot be
compared in this way. -Correct Answer ✔ ✔ C. 10 psig is a greater
pressure than 10 psia.
Flash gas is (BLANK).
A. the gas created at the expansion device.
B. the gas is used to defrost evaporators that use gas defrost systems.
C. the gas created anytime liquid refrigerant evaporates.
D. a flammable refrigerant gas. -Correct Answer ✔ ✔ B. the gas is
used to defrost evaporators that use gas defrost systems.
Which of the answers below is an example of pressure drop?
A. The difference in pressure due to refrigerant "dropping" in a
vertical pipe riser.
B. In a compressor, the difference in pressure when the piston is at
top dead center and bottom dead center.
Which refrigerant in table 3-2 would operate at the lowest suction
pressure with an evaporator temperature of 10 degrees Fahrenheit?
A. R-717
B. R-507
C. R-404a
D. R-134a -Correct Answer ✔ ✔ D. R-134a
What is the freezing point of water?
A. -32 degrees Fahrenheit.
B. 32 degrees Celsius.
C. 32 degrees Fahrenheit.
D. 0 degrees Fahrenheit. -Correct Answer ✔ ✔ C. 32 degrees
Fahrenheit
,Chapter 2 - Refrigeration Cycle Study Questions
If a liquid below is saturation temperature, what is its condition?
A. Superheated.
B. Subcooled.
C. Saturated.
D. Vaporized. -Correct Answer ✔ ✔ B. Subcooled.
Why does the refrigerant in the condenser change state from vapor to
liquid?
A. The pressure is decreased by the compressor.
B. The refrigerant runs down into the receiver.
C. The refrigerant loses heat energy to the surrounding environment.
,D. The fans increase the pressure to above saturation. -Correct
Answer ✔ ✔ C. The refrigerant loses heat energy to the
surrounding environment.
Which items does the expansion valve control?
A. The flow of liquid into the evaporator.
B. The pressure in the evaporator.
C. The pressure in the receiver.
D. The system operating pressure. -Correct Answer ✔ ✔ A. The
flow of liquid into the evaporator.
Which of the following statement is true?
A. 10 psia is a greater pressure than 10 psig.
B. 10 psig is equal to 10 psia.
C. 10 psig is a greater pressure than 10 psia.
, D. 10 psig and 10 psia use different scales and therefore cannot be
compared in this way. -Correct Answer ✔ ✔ C. 10 psig is a greater
pressure than 10 psia.
Flash gas is (BLANK).
A. the gas created at the expansion device.
B. the gas is used to defrost evaporators that use gas defrost systems.
C. the gas created anytime liquid refrigerant evaporates.
D. a flammable refrigerant gas. -Correct Answer ✔ ✔ B. the gas is
used to defrost evaporators that use gas defrost systems.
Which of the answers below is an example of pressure drop?
A. The difference in pressure due to refrigerant "dropping" in a
vertical pipe riser.
B. In a compressor, the difference in pressure when the piston is at
top dead center and bottom dead center.
