Compressors Chapter 23 Assessment Test Questions with Certified Answers
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Compressors Chapter 23 Assessment
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Compressors Chapter 23 Assessment
Compressors Chapter 23 Assessment Test Questions with Certified Answers
What lubricates the refrigeration compressor? - Answer-Oil
What can a service technician do to keep the refrigeration system operating at peak efficiency? - Answer-Keeping the evaporator and condenser clean will enhance th...
Compressors Chapter 23 Assessment
Test Questions with Certified Answers
What lubricates the refrigeration compressor? - Answer-Oil
What can a service technician do to keep the refrigeration system operating at peak
efficiency? - Answer-Keeping the evaporator and condenser clean will enhance the
compressor ratio. Running suction pressure as high as practical ... running discharge
pressure as low as practical
What advantage does a discus valve plate have over a conventional piston type
compressor - Answer-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 through the port
within a short period of time. Capacity modulation (10 - 100%) = 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. These 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-No volumetric losses through gas re expansion. Does not have
valve losses that contribute to inefficiencies. No valve noise and very soft gas pulsation
noises/vibration. Separation of suction and discharge gases reduce heat transfer loss.
Mating scrolls maintain nearly continuous compression and constant leak free contact.
Radial movement allows compressor to handle some liquid.
What are two main reasons a compressor should have modulating capacity control -
Answer-reduce power consumption , produce better dehumidification control, and
reduce compressor cycling along with small compressor starting currents
How does the digital capacity control for a scroll compressor work - Answer-Digital scroll
compressor is a disengaging solenoid valve for bypassing discharge gas to the suction
side of the compressor. An energized solenoid valve will unload the compressor by
axially separation the scrolls making the compressor capacity zero
Describe the operation of a compressor - Answer-It lifts the low pressure gas from the
suction side of the system to the discharge side of the system = vapor pump
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