If there is a shut-off valve between the aftercooler and the receiver, the aftercooler must be fitted with a?

If there is a shut-off valve between the aftercooler and the receiver, the aftercooler must be fitted with a?

a. safety valve
b. pressure gage
c. thermometer
d. all of the above




Answer: A

Intercoolers should be provided with what on the cooling water side?

Intercoolers should be provided with what on the cooling water side?

a. safety valve
b. pressure gage
c. thermometer
d. all of the above




Answer: C

Reasons for cooling of air in a compressor is?

Reasons for cooling of air in a compressor is?

a. Remove water vapour
b. Remove oil vapour
c. Make cylinder lubrication more effective
d. All of the above
e. A and B





Answer: D

The use of an intercooler to cool the air between stages of compression will reduce the power required for compression by around __ %.

The use of an intercooler to cool the air between stages of compression will reduce the power required for compression by around __ %.

a. 5
b. 10
c. 15
d. 20
e. 25





Answer: C

Which compressor has moving blades attached to the rotor, alternating with fixed blades attached to the casing?

Which compressor has moving blades attached to the rotor, alternating with fixed blades attached to the casing?

a) rotary lobe units
b) screw units
c) sliding vane units
d) axial flow units
e) centrifugal units






Answer: D

Disadvantage of centrifugal compressor is?

Disadvantage of centrifugal compressor is?

a. High maintenance requirements
b. Oil in the air
c. Efficiency is lower than positive displacement compressor
d. Not suited for low capacity work
e. C and D





Answer: E