The criterion of the thermodynamic efficiency for rotary compressor is

The thermodynamic efficiency of rotary compressor is based on

A

Isothermal compression

B

Adiabatic compression

C

Isentropic compression

D

Polytropic compression

The type of rotary compressor used in aeroplanes, is of

A

Centrifugal type

B

Axial flow type

C

Radial flow type

D

None of these

The maximum delivery pressure in a rotary air compressor is

A

10 bar

B

20 bar

C

30 bar

D

50 bar

Which of the following motors one will choose to drive the rotary compressor?

A

D.C. shunt motor

B

D.C. series motor

C

Universal motor

D

Synchronous motor

A rotary compressor is driven by an

A

Electric motor

B

Engine

C

Either (A) or (B)

D

None of these

Rotary compressor is best suited for

A

Large quantity of air at high pressure

B

Small quantity of air at high pressure

C

Small quantity of air at low pressure

D

Large quantity of air at low pressure

Maximum delivery pressure is a rotary air compressor is of the order of

A

6 kg/cm²

B

10 kg/cm²

C

16 kg/cm²

D

25 kg/cm²

The type of rotary compressor used in gas turbines, is of

A

Centrifugal type

B

Axial flow type

C

Radial flow type

D

None of these

Axial flow compressor has the following advantage over centrifugal compressor

A

Larger air handling ability per unit frontal area

B

Higher pressure ratio per stage

C

Aerofoil blades are used

D

Higher average velocities

In a centrifugal compressor, the flow of air is ________ to the axis of compressor.

A

Parallel

B

Perpendicular

C

Inclined

D

None of these

The criterion of the thermodynamic efficiency for rotary compressor is

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