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Compressors, Gas Turbines and Jet Engines

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
0.05
0.001
0.005

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Compressors, Gas Turbines and Jet Engines
In a centrifugal compressor, the highest Mach number leading to shock wave in the fluid flow occurs at

Diffuser outlet radius
Impeller outlet radius
Impeller inlet radius
Diffuser inlet radius

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Compressors, Gas Turbines and Jet Engines
The blades of gas turbine are made of

Stainless steel
High nickel alloy
Carbon steel
High alloy steel

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Compressors, Gas Turbines and Jet Engines
A rotary compressor is driven by an

Either (A) or (B)
Electric motor
Engine
None of these

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Compressors, Gas Turbines and Jet Engines
Atmospheric pressure is 1.03 kg/cm and vapour pressure is 0.03 kg/cm. The air pressure will be

1.00 kg/cm²
1.06 kg/cm²
1.03 kg/cm²
0.53 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
Vt > Vo
V = Uo

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