Chapter 2 - The Refrigeration Cycle
Exam Questions & Answers (Grade
A+)
If a liquid is below its saturation temperature, what is its condition?
a. superheated
b. subcooled
c. saturated
d. vaporized -
correct answer ✅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 ✅the refrigerant loses heat energy to the
surrounding environment
Which item does the expansion valve control?
a. the flow of liquid into the evaporator
b. the pressure in the evaporator
,Chapter 2 - The Refrigeration Cycle
Exam Questions & Answers (Grade
A+)
c. the pressure in the receiver
d. the system operating pressure -
correct answer ✅the flow of liquid into the evaporator
Which of the following statements 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 ✅10 psig is a greater pressure than 10 psia
Flash gas is ____
a. the gas created at the expansion device
b. the gas used to defrost evaporators that use gas defrost systems
c. the gas created anytime liquid refrigerant evaporates
d. a flammable refrigerant gas -
correct answer ✅the gas created at the expansion device
, Chapter 2 - The Refrigeration Cycle
Exam Questions & Answers (Grade
A+)
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
the top dead center and bottom dead center
c. the loss of pressure as a fluid moves down the pipe due to the
interaction of the fluid and the inner walls of the pipe
d. the change in pressure between the condenser outlet and the
high pressure receiver -
correct answer ✅the loss of pressure as a fluid moves down the
pipe due to the interaction of the fluid and the inner walls of the
pipe
Refrigerant absorbs the most heat when ____
a. being superheated
b. being subcooled
c. changing from a liquid to a vapor
d. changing from a vapor to a liquid -
correct answer ✅changing from a liquid to a vapor
Exam Questions & Answers (Grade
A+)
If a liquid is below its saturation temperature, what is its condition?
a. superheated
b. subcooled
c. saturated
d. vaporized -
correct answer ✅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 ✅the refrigerant loses heat energy to the
surrounding environment
Which item does the expansion valve control?
a. the flow of liquid into the evaporator
b. the pressure in the evaporator
,Chapter 2 - The Refrigeration Cycle
Exam Questions & Answers (Grade
A+)
c. the pressure in the receiver
d. the system operating pressure -
correct answer ✅the flow of liquid into the evaporator
Which of the following statements 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 ✅10 psig is a greater pressure than 10 psia
Flash gas is ____
a. the gas created at the expansion device
b. the gas used to defrost evaporators that use gas defrost systems
c. the gas created anytime liquid refrigerant evaporates
d. a flammable refrigerant gas -
correct answer ✅the gas created at the expansion device
, Chapter 2 - The Refrigeration Cycle
Exam Questions & Answers (Grade
A+)
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
the top dead center and bottom dead center
c. the loss of pressure as a fluid moves down the pipe due to the
interaction of the fluid and the inner walls of the pipe
d. the change in pressure between the condenser outlet and the
high pressure receiver -
correct answer ✅the loss of pressure as a fluid moves down the
pipe due to the interaction of the fluid and the inner walls of the
pipe
Refrigerant absorbs the most heat when ____
a. being superheated
b. being subcooled
c. changing from a liquid to a vapor
d. changing from a vapor to a liquid -
correct answer ✅changing from a liquid to a vapor
