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

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

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 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

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

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

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

Volumetric efficiency of a compressor with clearance volume

A

Increases with increase in compression ratio

B

Decreases with increase in compression ratio

C

In not dependent upon compression ratio

D

May increase/decrease depending on compressor capacity

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 the decrease in compression ratio, the volumetric efficiency

A

Does not change

B

Increases

C

Decreases

D

First decrease and then increase

For a two stage compressor, if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will

A

Increase

B

Decrease

C

Remain unaffected

D

Other factors control it

Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine?

A

inlet valve closing before bottom dead centre

B

inlet valve closing after bottom dead centre

C

inlet valve opening before top dead centre

D

exhaust valve closing after top dead centre

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

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