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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.

None of these
Decreases
Does not change
Increases

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Compressors, Gas Turbines and Jet Engines
High air-fuel ratio is used in gas turbines

To reduce the exit temperature
To increase the output
To save fuel
To increase the efficiency

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Compressors, Gas Turbines and Jet Engines
Rotary compressors are suitable for

Low discharge at high pressure
Large discharge at low pressure
Large discharge at high pressure
Low discharge at low pressure

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Compressors, Gas Turbines and Jet Engines
The ratio of isentropic work to Euler work is known as

Work coefficient
Polytropic reaction
Pressure coefficient
Slip factor

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Compressors, Gas Turbines and Jet Engines
The volumetric efficiency of a compressor falls roughly as follows for every 5°C increase in atmospheric temperature

0.001
0.05
0.005
0.01

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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 minimum during

None of these
Isentropic compression
Polytropic compression
Isothermal compression

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