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COMPRESSORS, GAS TURBINES AND JET ENGINES

Compressors, Gas Turbines and Jet Engines
If the clearance ratio for a reciprocating air compressor is 'K', then its volumetric efficiency is given by

1 - k + k (p₁/p₂)1/n
1 - k + k (p₁/p₂) n- 1/n
1 + k - k (p₂/p₁) n-1/n
1 + k - k (p₂/p₁)1/n

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Compressors, Gas Turbines and Jet Engines
Axial flow compressor has the following advantage over centrifugal compressor

Higher pressure ratio per stage
Higher average velocities
Larger air handling ability per unit frontal area
Aerofoil blades are used

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Compressors, Gas Turbines and Jet Engines
The pressure ratio of an ideal vaned compressor with increase in mass flow rate

Decreases
Increases
Remain constant
First decreases and then increases

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Compressors, Gas Turbines and Jet Engines
The thermal efficiency of a simple gas turbine for a given turbine inlet temperature with increase in pressure ratio

Decreases
First decreases and then increases
Increases
First increases and then decreases

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Compressors, Gas Turbines and Jet Engines
A closed cycle gas turbine consists of a

Cooling chamber
All of these
Compressor
Heating chamber

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