Related Questions

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%
Centrifugal compressors compared to reciprocating compressors
A Require less space
B Have quieter operation
C Have lower operating costs
D All of the above
In air compressors, free air delivery means the
A Actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions
B Volume of air delivered by the compressor
C Volume of air sucked by the compressor during its suction stroke
D None of the above
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 $$1 + {\text{K}} - {\text{K}}{\left( {\frac{{{{\text{p}}_2}}}{{{{\text{p}}_1}}}} \right)^{\frac{{{\text{n}} - 1}}{{\text{n}}}}}$$
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
Volumetric efficiency of a compressor decreases with ________ in compression ratio.
A Decrease
B Increase
C Remain same
D Does not change
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 compressor with increase in compression ratio will
A Increase
B Decrease
C Remain same
D May increase or decrease depending on clearance volume

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