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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
In which case the air-fuel ratio is likely to be maximum?

4-stroke petrol engine
Gas turbine
4-stroke diesel engine
Multi cylinder engine

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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 inlet radius
Impeller inlet radius
Diffuser outlet radius
Impeller outlet radius

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Compressors, Gas Turbines and Jet Engines
Axial flow compressor has the following advantage over centrifugal compressor

Aerofoil blades are used
Higher average velocities
Larger air handling ability per unit frontal area
Higher pressure ratio per stage

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Compressors, Gas Turbines and Jet Engines
A machine used to raise the pressure of air is called

Compressor
Air motor
I.C engine
Gas turbine

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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

Mechanical efficiency
Compressor efficiency
Isothermal efficiency
Volumetric efficiency

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Compressors, Gas Turbines and Jet Engines
There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would

Remain same
Increase
None of these
Decrease

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