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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The criterion of the thermodynamic efficiency for rotary compressor is

Isothermal compression
None of the listed here
Isentropic compression
Polytropic compression

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Compressors, Gas Turbines and Jet Engines
The maximum propulsion efficiency of a turbojet is attained at around following speed

1050 km/hr
2400 km/hr
1700 km/hr
550 km/hr

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Compressors, Gas Turbines and Jet Engines
Reheating in a gas turbine

Increases the thermal efficiency
Decreases the thermal efficiency
Increases the compressor work
Increases the turbine work

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Compressors, Gas Turbines and Jet Engines
Euler's equation can be used for

Axial flow compressors
All of these
Radial flow compressors
Pumps

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Compressors, Gas Turbines and Jet Engines
The output of a gas turbine is 300 KW and its efficiency is 20 percent, the heat supplied is

150 KW
6000 KW
15 KW
600 KW

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Compressors, Gas Turbines and Jet Engines
The work-done on a compressor will be minimum if air is taken from

The atmosphere
A source at 0° C
A source of low temperature air
A source of high temperature air

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