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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
Maximum delivery pressure is a rotary air compressor is of the order of

6 kg/cm²
10 kg/cm²
16 kg/cm²
25 kg/cm²

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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

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

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Compressors, Gas Turbines and Jet Engines
In air breathing jet engine, the jet is formed by expanding

Highly heated atmospheric air
Plasma
Solids
Liquid

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Compressors, Gas Turbines and Jet Engines
The compression ratio for the compressor is always _________ unity.

None of these
Less than
Equal to
More than

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Compressors, Gas Turbines and Jet Engines
The volumetric efficiency of a compressor falls roughly as follows for every 5°C increase in atmospheric temperature

0.01
0.005
0.001
0.05

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Compressors, Gas Turbines and Jet Engines
Mining industry usually employs following motive power

Petrol engine
Compressed air
Diesel engine
C. electric motor

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