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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
In a single stage, single acting reciprocating air compressor without clearance volume, the work-done is maximum during

Isentropic compression
Isothermal compression
Polytropic compression
None of these

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Compressors, Gas Turbines and Jet Engines
In jet engines, paraffin is usually used as the fuel because of its

Ease of atomisation
Both (A) and (C) above
High calorific value
Low freezing point

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Compressors, Gas Turbines and Jet Engines
The clearance volume of the air compressor is kept minimum because

It results in minimum work
It permits isothermal compression
It allows maximum compression to be achieved
It greatly affects volumetric efficiency

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Compressors, Gas Turbines and Jet Engines
A closed cycle gas turbine consists of a

All of these
Cooling chamber
Compressor
Heating chamber

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Compressors, Gas Turbines and Jet Engines
The ratio of the indicated power to the shaft power or brake power of the motor or engine required to drive the compressor, is called

Isothermal efficiency
Volumetric efficiency
Compressor efficiency
Mechanical efficiency

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Compressors, Gas Turbines and Jet Engines
Volumetric efficiency of air compressors is of the order of

20 - 30%
60 - 70%
40 - 50%
70 - 90%

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