Chapter 24 Air Compression

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) Air is compressed by a piston moving back and forth within a piston

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) Are commonly used for large volume, low pressure applications

Question 3

Air compressor receivers:

a) Are used to cool the air
b) Must conform to ASME Code, Section VI
c) Allow moisture and oil to be removed from the air
d) Are always connected to the suction of the compressor

Answer 3

c) Allow moisture and oil to be removed from the air

Question 4

Adsorbents and absorbents:

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) Are two different classes of sorbents

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) All of the above