Compressors Flashcards
A(n) ____ prevents refrigerant leaks around the shaft of an open-drive compressor.
shaft seal
(T/F) If the pulley on an open-drive compressor has a diameter three times greater than the pulley on the drive motor, the compressor shaft will rotate three times faster than the motor shaft.
True
(T/F) Direct-drive compressors generally turn at a different speed than its motor.
False
(T/F) The cases of fully hermetic compressors are typically bolted together.
False
What is the best description of how a fully hermetic compressor is lubricated?
They are lubricated by oil carried through the refrigerant.
Compressor parts that are usually bolted together usually contain ____ to prevent leaks.
gaskets
(T/F) In a scroll compressor, refrigerant vapor is compressed between two spinning scrolls.
False
The gas is compressed between a fixed scroll and an orbiting scroll.
In scroll compressors, refrigerant typically enters the scrolls from the ____ and exits out the ____.
sides
center
In a centrifugal compressor, the spinning ____ flings refrigerant outward, compressing it against the casing.
impeller
Adding refrigerant and lubricant, checking pressure, and other procedures require the use of ____.
service valves
An HVACR muffler uses a ____ to reduce noise caused by gas pulsations .
set of baffles
A measure of an oil’s ability to flow at given temperatures is its ____.
vescosity
An internal unloader is typically operated by ____.
oil pressure controlled by a solenoid valve
To prevent liquid refrigerant slugging and oil slugging on compressors that operate in low ambient temperatures, they are equipped with ____.
crankcase heater
