Chapter 27

Question 1

A reciprocating compressor is one in which:A. Vanes are fitted into radial slots
B. There are two intermeshing screws
C. Air is compressed by a piston, moving back and forth within a piston
D. Air is increased in velocity and the velocity is converted to pressure

Answer 1

C

Question 2

Centrifugal compressors:A. Are commonly used for large-volume, low-pressure applications.
B. Rotate at very low speeds.
C. Are classified as positive displacement compressors.
D. Require suction and discharge valves.

Answer 2

A

Question 3

Air compressor receivers:A. Are used to cool the air.
B. Must conform to ASME Code Section 6.
C. Allow moisture and oil to be removed from the air.
D. Are always connected to the suction of the compressor.

Answer 3

C

Question 4

Absorbents and adsorbents:A. are the same thing but spelled differently.
B. are two different classes of sorbents.
C. both have water collected on their surface.
D. are used to cool the air.

Answer 4

B

Question 5

Lubricating oil is necessary in an air compressor to perform which of the following functions?A. Reduce friction and resulting power loss by providing a film between surfaces.
B. Remove heat produced by friction.
C. Reduce corrosion by providing a coating for metal surfaces.
D. All of the above.

Answer 5

D