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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The compression ratio for the compressor is always _________ unity.

Equal to
None of these
More than
Less than

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Compressors, Gas Turbines and Jet Engines
In multistage compressor, the isothermal compression is achieved by

Employing inter-cooler
By insulating the cylinder
By running compressor at very slow speed
By constantly cooling the cylinder

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Compressors, Gas Turbines and Jet Engines
The efficiency of the vane blower is (where W₁ = Workdone due to compression, and W₂ = Workdone due to back flow)

(W₁ + W₂)/W₁
W₁/(W₁ + W₂)
W₂/(W₁ + W₂)
(W₁ + W₂)/W₂

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

Increases
None of these
Decreases
Does not change

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Compressors, Gas Turbines and Jet Engines
The thrust on the rotor in a centrifugal compressor is produced by

Radial component
None of these
Axial component
Tangential component

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Compressors, Gas Turbines and Jet Engines
The work ratio of simple gas turbine cycle depends on

All of these
Maximum cycle temperature
Pressure ratio
Minimum cycle temperature

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