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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.

Increases
Does not change
Decreases
None of these

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Compressors, Gas Turbines and Jet Engines
The pressure of air at the beginning of the compression stroke is ___ the atmospheric pressure.

Equal to
More than
None of the listed here
Less than

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Compressors, Gas Turbines and Jet Engines
The minimum work required for a three stage reciprocating air compressor is ___ the work required for each stage.

Double
Six times
Three times
Equal to

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

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

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Compressors, Gas Turbines and Jet Engines
Maximum work is done in compressing air when the compression is

Polytropic
Isothermal
Adiabatic
None of these

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Compressors, Gas Turbines and Jet Engines
The degree of reaction is usually kept ________ for all types of axial flow compressors.

0.2
0.5
0.4
0.3

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