Chapter 23

Question 1

What does the automatic expansion valve strive to control?
A. Compressor suction pressure
B. Compressor discharge pressure
C. Refrigerant flow
D. Refrigerant system temperature

Answer 1

A

Question 2

What are the three controlling pressures in a thermostatic expansion valve?
A. Thermal element
B. Spring
C. Evaporator pressure
D. All of the above

Answer 2

D

Question 3

What is the purpose of the weighted valve pin used for the high-pressure float valve?
A. Control the flow of refrigerant into the evaporator.
B. Reduce the amount of line frosting after the float valve.
C. Maintain a back pressure in the condenser.
D. Control the pressure in the refrigeration system.

Answer 3

B

Question 4

Which of the following are methods used to control the speed of a compressor?
A. Variable speed electric motor.
B. Temperature sensing device controlling the turbine inlet steam flow.
C. Hydraulic coupling installed between a constant speed driver and the compressor to vary the speed.
D. All of the above.

Answer 4

D