An ideal air compressor cycle without clearance on P-V diagram can be represented by following processes

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

A

One adiabatic, two isobaric, and one constant volume

B

Two adiabatic and two isobaric

C

Two adiabatic, one isobaric and one constant volume

D

One adiabatic, one isobaric and two constant volumes

In a single acting reciprocating air compressor, without clearance, the compression of air may be

A

Isothermal

B

Polytropic

C

Isentropic

D

Any one of these

The area of actual indicator diagram on an air compressor as compared to area of ideal indicator diagram is

A

Less

B

More

C

Same

D

More/less depending on compressor capacity

In a single stage, single acting reciprocating air compressor without clearance volume, the work-done is maximum during

A

Isothermal compression

B

Isentropic compression

C

Polytropic compression

D

None of these

In a single stage, single acting reciprocating air compressor, without clearance volume, the work-done is minimum during

A

Isothermal compression

B

Isentropic compression

C

Polytropic compression

D

None of these

Volumetric efficiency of a compressor without clearance volume

A

Increases with increase in compression ratio

B

Decreases with increase in compression ratio

C

Is not dependent upon compression ratio

D

May increase/decrease depending on compressor capacity

If the clearance ratio for a reciprocating air compressor is 'K', then its volumetric efficiency is given by

A

$$1 - {\text{K}} + {\text{K}}{\left( {\frac{{{{\text{p}}_1}}}{{{{\text{p}}_2}}}} \right)^{\frac{1}{{\text{n}}}}}$$

B

$$1 + {\text{K}} - {\text{K}}{\left( {\frac{{{{\text{p}}_2}}}{{{{\text{p}}_1}}}} \right)^{\frac{1}{{\text{n}}}}}$$

C

$$1 - {\text{K}} + {\text{K}}{\left( {\frac{{{{\text{p}}_1}}}{{{{\text{p}}_2}}}} \right)^{\frac{{{\text{n}} - 1}}{{\text{n}}}}}$$

D

$$1 + {\text{K}} - {\text{K}}{\left( {\frac{{{{\text{p}}_2}}}{{{{\text{p}}_1}}}} \right)^{\frac{{{\text{n}} - 1}}{{\text{n}}}}}$$

The clearance volume of the air compressor is kept minimum because

A

It allows maximum compression to be achieved

B

It greatly affects volumetric efficiency

C

It results in minimum work

D

It permits isothermal compression

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

A

Parallel

B

Perpendicular

C

Inclined

D

None of these

If the flow of air through the compressor is parallel to its axis, then the compressor is

A

Reciprocating compressor

B

Centrifugal compressor

C

Axial flow compressor

D

Turbo compressor

An ideal air compressor cycle without clearance on P-V diagram can be represented by following processes

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