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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The performance of air compressor at high altitudes will be ________ as compared to that at sea level.

Same
None of these
Higher
Lower

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Compressors, Gas Turbines and Jet Engines
Stalling of blades in axial flow compressor is the phenomenon of

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

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Compressors, Gas Turbines and Jet Engines
Axial flow compressor has the following advantage over centrifugal compressor

Higher average velocities
Larger air handling ability per unit frontal area
Higher pressure ratio per stage
Aerofoil blades are used

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Compressors, Gas Turbines and Jet Engines
A 3 m³/min compressor means that it

Delivers 3 m³/ min of compressed air at delivery pressure
Delivers 3 m³/ min of compressed air
Compresses 3 m³/ min of free air
Compresses 3 m³/min of standard air

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Compressors, Gas Turbines and Jet Engines
Water is injected in gas turbine cycle to

Control output of turbine
Control temperature
Control fire hazards
Increase efficiency

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Compressors, Gas Turbines and Jet Engines
The pressure of air at the beginning of the compression stroke is ___ the atmospheric pressure.

More than
Equal to
Less than
None of the listed here

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