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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The most efficient method of compressing air is to compress it

Isothermally
Isochronically
Isentropically
Adiabatically

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Compressors, Gas Turbines and Jet Engines
The pressure ratio in gas turbines is of the order of

0.084027777777778
0.37569444444444
0.16736111111111
2.5423611111111

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Compressors, Gas Turbines and Jet Engines
In gas turbines, high thermal efficiency is obtained in

Closed cycle
Closed/open depending on other considerations
Open cycle
Closed cycle & Open cycle

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Compressors, Gas Turbines and Jet Engines
Gas turbine blades are given a rake

Equal to zero
Opposite to the direction of motion of blades
In the direction of motion of blades
Depending on the velocity

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Compressors, Gas Turbines and Jet Engines
The work-done on a compressor will be minimum if air is taken from

A source of low temperature air
The atmosphere
A source at 0° C
A source of high temperature air

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Compressors, Gas Turbines and Jet Engines
The following property is most important for material used for gas turbine blade

Creep
Toughness
Fatigue
Corrosion resistance

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