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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The criterion of the thermodynamic efficiency for rotary compressor is

Isentropic compression
Polytropic compression
Isothermal compression
None of the listed here

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Compressors, Gas Turbines and Jet Engines
A rocket works with maximum overall efficiency when air craft velocity is equal to the

Twice the jet velocity
Half the jet velocity
Jet velocity
Average of the jet velocity

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Compressors, Gas Turbines and Jet Engines
The type of rotary compressor used in aeroplanes, is of

Axial flow type
Centrifugal type
None of these
Radial flow type

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Compressors, Gas Turbines and Jet Engines
Maximum work is done in compressing air when the compression is

Polytropic
Adiabatic
Isothermal
None of these

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Compressors, Gas Turbines and Jet Engines
A closed gas turbine in which fuel is burnt directly in the air is not possible because of

Increasing gas temperature
High friction losses
High specific volume
Paucity of O2

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Compressors, Gas Turbines and Jet Engines
Losses in a centrifugal compressor are due to

Inlet losses
All of the listed here
Diffuser losses
Impeller channel losses

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