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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
In jet engines, for the efficient production of large power, fuel is burnt in an atmosphere of

Oxygen alone
Vacuum
Atmospheric air
Compressed air

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

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

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Compressors, Gas Turbines and Jet Engines
Adiabatic compression is one in which

Work done is maximum
No heat leaves or enters the compressor cylinder during compression
Temperature rise follows a linear relationship
Temperature during compression remains constant

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Compressors, Gas Turbines and Jet Engines
More than one stage will be preferred for reciprocating compressor if the delivery pressure is more than

10 kg/cm²
2 kg/cm²
6 kg/cm²
14.7 kg/cm²

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Compressors, Gas Turbines and Jet Engines
The velocity of air entering in a rocket is ___ as compared to an aircraft.

More
Zero
Same
Less

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Compressors, Gas Turbines and Jet Engines
Surging is the phenomenon of

Air stream not able to follow the blade contour
Unsteady, periodic and reversed flow
Air stream blocking the passage
Motion of air at sonic velocity

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