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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The working fluid in a turbine is

In a single phase
In three phases
In two phases
In the form of air and water mixture

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Compressors, Gas Turbines and Jet Engines
Reheating in multistage expansion gas turbine results in

Decrease of heat loss in exhaust
Reduction in compressor work
Maximum work output
High thermal efficiency

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Compressors, Gas Turbines and Jet Engines
If V, U and Vr represent the absolute velocity of fluid, velocity of blade, and relative velocity of fluid, and suffix ‘I’ and ‘o’ stand for entry and exit conditions, then in a rotary machine whose degree of reaction is unity

Vi = Vo
U < Vo
V = Uo
Vt > Vo

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Compressors, Gas Turbines and Jet Engines
The ratio of the indicated power to the shaft power or brake power of the motor or engine required to drive the compressor, is called

Isothermal efficiency
Mechanical efficiency
Volumetric efficiency
Compressor efficiency

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Compressors, Gas Turbines and Jet Engines
The ratio of the discharge pressure to the inlet pressure of air is called

Volumetric efficiency
Compressor efficiency
Expansion ratio
Compression ratio

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Compressors, Gas Turbines and Jet Engines
The ratio of the volume of free air delivery per stroke to the swept volume of the piston, is known as

Compressor efficiency
Volumetric efficiency
Mechanical efficiency
Isothermal efficiency

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