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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
In a centrifugal compressor, the flow of air is ________ to the axis of compressor.

Perpendicular
Inclined
None of these
Parallel

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

None of these
Does not change
Increases
Decreases

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Compressors, Gas Turbines and Jet Engines
Gas turbine as compared to internal combustion engine

Has more efficiency
Can be driven at a very high speed
Produces uniform torque
All of the listed here

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

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Compressors, Gas Turbines and Jet Engines
In a single stage, single acting reciprocating air compressor without clearance volume, the work-done is maximum during

None of these
Isothermal compression
Polytropic compression
Isentropic compression

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Compressors, Gas Turbines and Jet Engines
A closed cycle gas turbine gives ________ efficiency as compared to an open cycle gas turbine.

Higher
Same
None of these
Lower

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