Unit 23 Quiz Flashcards
If the compression ratio of a reciprocating compressor increases, the amount of refrigerant pumped by the compressor ________.
Will decrease
What component connects the piston to the crankshaft in a reciprocating compressor?
Connecting rod
Flank sealing takes place in a ______ compressor.
Scroll
The hermetic compressor shell is typically thought of as a _______ component.
Low side
Two-stage compression is not generally used until the compression ratio exceeds 10:1, often experienced with __________.
Low temperature refrigeration
What is the function of the compressor in a refrigeration system?
It is a vapor pump that converts low pressure low temperature vapor into high pressure high temperature vapor
Compute the compression ratio using 14.7 psi as the conversion factor when the suction pressure is -3.1 psig and the discharge pressure is 198.9 psig for a low temp system using R-404A.
True or false: A semi-hermetic compressor can be taken apart and serviced.
True
True or false: The screw compressor uses an open motor instead of the hermetic design.
True
True or false: Motors for hermetic compressors are manufactured with the same materials as standard electric motors that operate in an open-air environment.
False
True or false: The rotary screw compressor is another name for the rotary type compressor.
False
True or false: To keep refrigerant vapor from leaking over the top of the scrolls, tip seals are used.
True
True or false: The centrifugal compressor is a positive displacement type compressor.
False
True or false: High compression ratios above 12:1 are not recommended by most manufacturers.
True
True or false: Open drive compressors are manufactured in two styles, belt driven or gear driven.
False