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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 minimum during

Isothermal compression
None of these
Isentropic compression
Polytropic compression

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Compressors, Gas Turbines and Jet Engines
The thermal efficiency of a simple gas turbine for a given turbine inlet temperature with increase in pressure ratio

Decreases
First increases and then decreases
Increases
First decreases and then increases

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Compressors, Gas Turbines and Jet Engines
In the aircraft propellers

Propulsive matter is ejected from within the propelled body
Its functioning does not depend on presence of air
All of these
The propulsive matter is caused to flow around the propelled body

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Compressors, Gas Turbines and Jet Engines
The ideal efficiency of simple gas turbine cycle depends on

Minimum cycle temperature
All of these
Maximum cycle temperature
Pressure ratio

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

0.37569444444444
0.16736111111111
2.5423611111111
0.084027777777778

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Compressors, Gas Turbines and Jet Engines
Actual compression curve is

Same as adiabatic
Better than isothermal and adiabatic
Same as isothermal
In between isothermal and adiabatic

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