Compresssor EOAP-2023

A compressor increases the ___ of a gas by ___ its ___ .

• pressure, reducing, volume

• pressure, increasing, volume

• pressure, reducing, temperature

• pressure, increasing, temperature

Following type is a positive displacement compressor

• Screw

• Diaphragm

• Centrifugal

• All of the above

Reciprocating compressors use ___ driven by a ___ .

• belt, pulley

• chain, sprocket

• pistons, crankshaft

• any of the above

Reciprocating compressors suffer higher losses due to

• clearance volumes

• resistance due to discharge and suction valves

• more weight

• all of the above

A diffuser section in Centrifugal compressor coverts velocity energy to

• mechanical energy

• heat energy

• pressure energy

• potential energy

A centrifugal compressor works on the principle of

• conversion of pressure energy into kinetic energy

• conversion of kinetic energy into pres¬sure energy

• centripetal action

• generating pressure directly

• combination of (a) and (d).

Actual compression curve is

• same as isothermal

• same as adiabatic

• better than isothermal and adiabatic

• in between isothermal and adiabatic

• none of the above.

Adiabatic compression is one in which

• emperature during compression remains constant

• no heat leaves or enters the compressor cylinder during cornpression

• temperature rise follows a linear relationship

• work done is maximum

• entropy decreases.

After-cooler is used to

• cool the air

• decrease the delivery temperature for ease in handling

• cause moisture and oil vapour to drop out

• reduce volume

• increase pressure.

An ideal air compressor cycle with clearance on p-v diagram can be represented by following processes

• one adiabatic, two isobaric, and one constant volume

• two adiabatic and two isobaric

• two adiabatic, one isobaric and one constant volume,

• one adiabatic, one isobaric and two constant volume

• two isobaric, two adiabatic and one constant volume.