Volumetric efficiency of a compressor with clearance volume

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 variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost are P. Inlet pressure Q. Compressor rpm R. Delivery pressure S. Volumetric flow rate at inlet.

A

P, Q and R

B

P and R

C

R and S

D

P, R and S

Volumetric efficiency of a compressor decreases with ________ in compression ratio.

A

Decrease

B

Increase

C

Remain same

D

Does not change

The volumetric efficiency of compressor with increase in compression ratio will

A

Increase

B

Decrease

C

Remain same

D

May increase or decrease depending on clearance volume

The volumetric efficiency of a compressor

A

Increases with decrease in compression ratio

B

Decreases with decrease in compression ratio

C

Increases with increase in compression ratio

D

Decreases with increase in compression ratio

With increase in compression ratio, the volumetric efficiency of air compressor

A

Increases

B

Decreases

C

Remains same

D

May increase or decrease (depends on the suction pressure)

The net work input required for compressor with increase in clearance volume

A

Increases

B

Decreases

C

Remains same

D

Increases/decreases 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 with clearance volume

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