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Compressors Unit 23 Test Questions with All Correct Answers

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Compressors Unit 23 Test Questions with All Correct Answers List the main advantages that a discus compressor's valve plate design has over a conventional piston-type compressor. - Answer-has closer tolerance at dead top center, a larger bore, capacity modulation range from 10 to 100% Briefly ...

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  • September 13, 2024
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  • 2024/2025
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Compressors Unit 23 Test Questions
with All Correct Answers
List the main advantages that a discus compressor's valve plate design has over a
conventional piston-type compressor. - Answer-has closer tolerance at dead top center,
a larger bore, capacity modulation range from 10 to 100%

Briefly describe how the scroll compressor compresses refrigerant gas. - Answer-by
turning one scroll against a stationary one around a common axis

List four main advantages a scroll compressor has over a conventional piston-type
compressor. - Answer-less parts, less noise, no valves, some liquid

What are the two main reasons why a compressor should have modulating capacity
control? - Answer-reduces the suction pressure and temperature variation and allows a
decrease in the compressor's cycling rate.

Briefly describe how the digital capacity control for a scroll compressor works. - Answer-
a controlled amount of refrigerant can be by-passed through a solenoid valve

List the three main advantages of having digital capacity control on a scroll compressor.
- Answer-holds precise temp, no short-cycling, amp and voltage imbalance

Explain how a compressor can be oil-free. - Answer-the oil-free centrifugal compressor
has only two moving parts; the rotor shaft and the impellers. the bearings are magnetic.

List two types of compressor failure. - Answer-mechanical, electrical, acid failure

What is the best way to check for a grounded compressor. - Answer-megger

How do you check for acid? - Answer-acid test kit

How do you clean up a compressor burn out? - Answer-FLUSH( evap condenser lines
w/RX11) CHANGE oil and filter dryer, ADD acid away, suction line filter dryer, new
refrigerant

What will a constant high superheat cause? - Answer-compressor burn out which
contaminates the other components

What do you look for after you change a compressor? - Answer-check for liquid flood
back

High superheat, high subcooling, whats the problem? - Answer-restriction

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