Fans Exhausters and Compressors PHEP

Question 1

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

Answer 1

in direct proportion to an increase in its pressure

Question 2

Absolute pressure is equal to

Answer 2

gauge pressure plus 14.7

Question 3

If 500 cubic inches of gas under 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 the fan rotor
speed of the fan rotor
density of the air
all three of the above

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 unbalance

Question 6

Which of the following conditions would not normally contribute to a reciprocating air compressor explosion?

Answer 6

excessive compressed air demands

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 caused 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 moisture or sludge
all of the above