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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The pressure ratio of an ideal vaned compressor with increase in mass flow rate

Decreases
First decreases and then increases
Increases
Remain constant

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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

Isentropic
Isothermal
Polytropic
Any one of these

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Compressors, Gas Turbines and Jet Engines
The ratio of work-done per cycle to the stroke volume of the compressor is known as

Compressor efficiency
Compression ratio
Mean effective pressure
Compressor capacity

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

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

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Compressors, Gas Turbines and Jet Engines
The stagnation pressure rise in a centrifugal compressor takes place

In the diffuser and impeller
In the diffuser only
In the inlet guide vanes only
In the impeller only

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Compressors, Gas Turbines and Jet Engines
It is not possible to use closed gas turbine cycle in aeronautical engines because

None of these
It requires cooling water for its operation
It is inefficient
It is bulky

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