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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The efficiency of roots blower ________ with the increase in pressure ratio.

Does not change
Increases
Decreases
None of these

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Compressors, Gas Turbines and Jet Engines
If infinite number of heaters be used in a gas turbine, then expansion process in turbine approaches

Isentropic
Isothermal
Adiabatic
Isochoric

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Compressors, Gas Turbines and Jet Engines
Open cycle gas turbine works on

Rankine cycle
Carnot cycle
Ericsson cycle
Brayton or Atkinson cycle

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Compressors, Gas Turbines and Jet Engines
Gas turbine cycle with regenerator

Allows operation at very high altitudes
Decreases heat loss is exhaust
Allows high compression ratio
Increases thermal efficiency

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Compressors, Gas Turbines and Jet Engines
The air-fuel ratio in gas turbines is of the order of

7: 1
15: 1
50: 1.
30: 1

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Compressors, Gas Turbines and Jet Engines
In axial flow compressor, exit flow angle deviation from the blade angle is a function of

Blade camber and space-chord ratio
Blade camber and incidence angle
Space-chord ratio
Blade camber

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