PHEP Ch.7 Flashcards
If all other factors are held constant , the volume of a dry gas decreases:
-in direct proportion to an increase in its pressure
Absolute pressure is equal to
Gauge pressure plus 14.7
If 500 cubic inches of gas under a pressure of 15 Psia is compressed to 20 cubic inches, what will the pressure be ?
P2/p1= v1/v2
375 psia
The quantity and pressure of air discharged from a centrifugal fan depends on the :
-size of the rotor
-speed of the fan rotor
-density of the air
Increasing the speed of an unbalanced shaft will:
Move the center of gravity, further, from the axis of rotation, thereby increasing the unbalance 
Which of the following conditions would not normally contribute to be reciprocating air compressor explosion?
Excessive compressed air demands
Large reciprocating air compressors are generally unloaded while starting and stopping to:
Reduce the starting torque and permit, more gradual stopping
The temperature of which molecules of water vapor begin to condense up on the surface of objects as air is cooled, is called the
Dewpoint
High outlet compressed air temperatures could be caused by all of the following except
Low oil level
Air receivers are installed on all reciprocating air compressors to
-dampen pressure waves
-reduce pressure drops
-remove moisture or sludge