With the decrease in compression ratio, the volumetric efficiency

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

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)

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

Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle

A

Heat rejection is lower

B

Expansion and compression are isentropic

C

Combustion is at constant volume

D

Maximum temperature is higher

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

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

Highest useful compression ratio (HUCR) is the highest compression ratio at which the

A

Engine can run

B

Engine gives maximum output

C

Engine is most efficient

D

Fuel can be used in a test engine without knocking

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 for reciprocating air compressors is about

A

10 to 40%

B

40 to 60%

C

60 to 70%

D

70 to 90%

With the decrease in compression ratio, the volumetric efficiency

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