Compressors, Gas Turbines and Jet Engines
An ideal air compressor cycle without clearance on P-V diagram can be represented by following processes

Two adiabatic and two isobaric
One adiabatic, two isobaric, and one constant volume
Two adiabatic, one isobaric and one constant volume
One adiabatic, one isobaric and two constant volumes

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Compressors, Gas Turbines and Jet Engines
The overall efficiency of the compressed air system is the

Ratio of shaft input to the compressor to the shaft output of air motor
Product of shaft output of air motor and shaft input to the compressor
Ratio of shaft output of the air motor to the shaft input to the compressor
None of these

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Compressors, Gas Turbines and Jet Engines
Pick up the false statement

Exhaust losses in gas turbine are high due to large mass flow rate
Gas turbine does not require huge quantity of water like steam plant
Gas turbine is a self starting unit
Overall efficiency of gas turbine plant is lower than that of a reciprocating engine

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Compressors, Gas Turbines and Jet Engines
Volumetric efficiency of a compressor with clearance volume

Decreases with increase in compression ratio
In not dependent upon compression ratio
May increase/decrease depending on compressor capacity
Increases with increase in compression ratio

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