Chapter 15 homework
Which of the following statements regarding rotary compressors is not true?
Rotary compressors have low volumetric efficiency
Which of the following is a common method of cooling compressors
-using cool suction vapor and oil to cool the compressor motor -running water through water jackets in the compressor -blowing air across cooling fins on the compressors exterior
Which of the following best describes the compression action in a screw compressor
A pair of helical rotors trap and compress vapor between the lines in one rotor and the grooves in the other rotor
Which of the statements regarding centrifugal compressors is not true
Centrifugal compressors often have multiple impellers that operate in series
An ___ connects the piston to the crankshaft in an reciprocating compressor
Connecting rod
Which of the following statements regarding scroll compressors is not true?
In a scroll compressor vapor is compressed by a series of Pistons that travel in a spiral pattern through a fixed scroll
A reciprocating compressor that has a long piston with an elliptical slot in the bottom of the piston skirt and no connecting rod is referred to an ___
Scotch yoke design
Which of the following best describes a direct drive compressor?
The compressors crankshaft is connected to the motors drive shaft by coupling
Which of the following is a trait of stationary blade rotary compressors
The impeller is mounted on an eccentric shaft
The primary purpose of a crankcase heater is
To minimize the amount of liquid refrigerant in the compressor oil
