Compressors Unit 23 Exam Questions with Revised Answers
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Compressors Unit 23
Institution
Compressors Unit 23
Compressors Unit 23 Exam Questions with Revised Answers
Describe The reciprocating compressor coupling - Answer-Coupling: obtains the correct shaft alignment
Describe The reciprocating compressor discus valve - Answer-The discus valve which allows a closer tolerance inside the compressor cyl...
Compressors Unit 23 Exam Questions
with Revised Answers
Describe The reciprocating compressor coupling - Answer-Coupling: obtains the correct
shaft alignment
Describe The reciprocating compressor discus valve - Answer-The discus valve which
allows a closer tolerance inside the compressor cylinder at the top dead center and
integrated system electronics ?????
In what speed in RPM does a hermetic compressor normally turn - Answer-1750 and
3450rpm
What effect does a small amount of liquid have on a compressor over a long period of
time - Answer-Small amounts of liquid can cause liquid slugging, which causes oil
delution, large amounts can cause piston, valve and rod breakage
What lubricates the compressor - Answer-Oil lubricates the refrigeration compressor
What will enhance the peak performance of the compressor - Answer-Keeping the
evaporator and condenser clean will enhance the compressor ratio.
What advantage does a discus valve plate have over a conventional piston type
compresspor - Answer-The discus valve allows closer tolerance inside the compressor
cylinder at the top dead-center. The closer tolerance provides more efficiency because
of less clearance volume. It also has a larger bore and allows more gas thru the port
within a short period of time. (Capacity modulation reduces the suction pressure and
temp. variation of the refrigerated space and provides for a decrease in the compressor
cycling rate.
Describe how a scroll compressor compresses gas - Answer-Two spiral shaped scrolls
fit inside one another m the two mating parts are often referred to as involute spirals.
One of the spiral shaped parts stays stationary while the other orbits around it.
List four main advantages a scroll compressor has over a conventional piston type
compressor - Answer-The scroll can handle liquid refrigerant better by separating its
parts slightly and allow the pressurized gas to vent to suction pressure. This allows the
liquid slug to be swept from the mating scroll surfaces to the suction pressure and be
vaporized.
1 - Answer-- centrifugal forces along the side of the scroll along with some lubricating oil
for a seal that prevents gas pocket leakage
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