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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.

Increases
None of these
Does not change
Decreases

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Compressors, Gas Turbines and Jet Engines
Free air is the air at

20°C and 1 kg/cm² and relative humidity of 36%
0°C and standard atmospheric conditions
Atmospheric conditions at any specific location
15°C and 1 kg/cm²

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Compressors, Gas Turbines and Jet Engines
Air-fuel ratio in a jet engine will be of the order of

2.5006944444444
0.41736111111111
0.83402777777778
0.62569444444444

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Compressors, Gas Turbines and Jet Engines
The thermodynamic efficiency of rotary compressor is based on

Polytropic compression
Isothermal compression
Isentropic compression
Adiabatic compression

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Compressors, Gas Turbines and Jet Engines
The inlet pressure is always ___ the discharge pressure.

More than
Equal to
None of the listed here
Less than

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Compressors, Gas Turbines and Jet Engines
In a jet engine, the air-fuel ratio is

1.6673611111111
1.2506944444444
2.0840277777778
2.5006944444444

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