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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The minimum work required for a three stage reciprocating air compressor is ___ the work required for each stage.

Double
Three times
Six times
Equal to

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

Control output of turbine
Control fire hazards
Control temperature
Increase efficiency

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

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

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Compressors, Gas Turbines and Jet Engines
Which is false statement about advantages of multistage compressor in comparison to single stage compressor?

Less loss of air due to leakage past the cylinder
Better mechanical balance
Less power requirement
Lower volumetric efficiency

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Compressors, Gas Turbines and Jet Engines
The pressure ratio for an open cycle gas turbine compared to closed cycle gas turbine of same h.p. is

High
Same
Low/high depending on make and type
Low

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Compressors, Gas Turbines and Jet Engines
The hottest point in a gas turbine is

between ~ to i of the blade height
at the base
in the center
at the tip

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