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TRG-TRC004-EN 43
Questions for Period 1
1 What is the purpose of the compressor in a refrigeration system?
2 List the four primary types of compressors used in air-conditioning
applications.
3 What causes the suction valve to open on a reciprocating compressor?
4 True or False: The intake of refrigerant vapor in a scroll compressor occurs
at the outer edge of the scroll assembly and discharge occurs through the
port at the center of the scroll.
5 What is the term for the type of compressor that has the motor sealed
within the compressor housing?
Questions for Period 2
6 Assuming a constant condensing temperature, does the capacity of a
compressor increase or decrease as the suction temperature decreases?
7 What method of capacity control is commonly applied to scroll
compressors?
8 What method of capacity control is commonly applied to centrifugal
compressors?
Questions for Period 3
9 In a VAV DX system, the capacity of the compressor is typically controlled
by sensing _____. (space temperature, supply air temperature, chilled-water
supply temperature)
10 In a constant-volume chilled-water system, the capacity of the compressor
is typically controlled by sensing _____. (space temperature, supply air
temperature, chilled-water supply temperature)
11 In a constant-volume DX system, the capacity of the compressor is typically
controlled by sensing _____. (space temperature, supply air temperature,
chilled-water supply temperature)
12 What are the two common methods of preventing evaporator frosting in a
direct-expansion (DX) system?
Quiz