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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The gas in cooling chamber of a closed cycle gas turbine is cooled at

Constant volume
None of the listed here
Constant pressure
Constant temperature

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Compressors, Gas Turbines and Jet Engines
Reheating in a multistage expansion gas turbine ________ compressor work.

Increases
Decreases
None of these
Has no effect on

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Compressors, Gas Turbines and Jet Engines
Propulsive efficiency is defined as ratio of

Thrust power and propulsive power
Engine output and propulsive power
Propulsive power and fuel input
Thrust power and fuel energy

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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

Isentropic compression
Isothermal compression
Polytropic compression
None of these

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Compressors, Gas Turbines and Jet Engines
The ratio of the volume of free air delivery per stroke to the swept volume of the piston, is known as

Mechanical efficiency
Volumetric efficiency
Compressor efficiency
Isothermal efficiency

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Compressors, Gas Turbines and Jet Engines
Which is false statement about air receivers?

These increase compressor efficiency
These knock out some oil and moisture
These are used to dampen pulsations
These act as reservoir to take care of sudden demands

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