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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.

Parallel
None of these
Perpendicular
Inclined

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Compressors, Gas Turbines and Jet Engines
Which is false statement about multistage compression?

The moisture in air is condensed in the inter-cooler
It is best suited for compression ratios around 7:1
Volumetric efficiency is high
Power consumption per unit of air delivered is low

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Compressors, Gas Turbines and Jet Engines
The overall thermal efficiency of an ideal gas turbine plant is (where r = Pressure ratio)

1 - r ɣ-1
1 - (1/r) ɣ-1/ɣ
1 - (1/r) ɣ/ɣ-1
r ɣ-1

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Compressors, Gas Turbines and Jet Engines
Isothermal compression though most efficient, but is not practicable because

It requires very big cylinder
It does not increase pressure much
It is impossible in practice
Compressor has to run at very slow speed to achieve it

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Compressors, Gas Turbines and Jet Engines
A rocket engine uses __________ for the combustion of its fuel.

Its own oxygen
Surrounding air
Compressed atmospheric air
None of these

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Compressors, Gas Turbines and Jet Engines
In a single acting reciprocating air compressor, without clearance, the compression of air may be

Any one of these
Isentropic
Isothermal
Polytropic

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