PHEP 7

Question 1

If all other factors are held constant, the volume of a dry gas decreases

Answer 1

Proportional to its increase of pressure

Question 2

Absolute pressure is equal to

Answer 2

Gauge pressure plus 14.7

Question 3

If 500 Cubic inches of gas under a pressure of 15 psia is compressed to 20 cubic inches, what will the new pressure be?

Answer 3

375 psia

Question 4

The quantity and pressure of air discharged from a centrifugal fan depends on the

Answer 4

size of rotor, speed of rotor, density of air

Question 5

increasing the speed of an unbalanced shaft will

Answer 5

Move the center of gravity further from the axis of rotation thereby increasing the unbalanced

Question 6

which of the following conditions wound NOT normally contribute to a reciprocating air compressor explosion?

Answer 6

Excessive compressed air demand

Question 7

Large reciprocating air compressors are generally unloaded while starting and stopping to`

Answer 7

Reduce the starting torque and permit more gradual stopping

Question 8

The temperature at which molecules of water vapor begin to condense upon the surface of objects as air is cooled is called the

Answer 8

Dew point

Question 9

High outlet compressed air temperatures could be cause by all of the following except:

Answer 9

Low oil level

Question 10

Air receivers are installed on all reciprocating air compressors to:

Answer 10

Dampen pressure waves, reduce pressure drops, remove sludge/moisture