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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
Pick up wrong statement. Surging phenomenon in centrifugal compressor depends on

Stagnation pressure at the outlet
Pressure ratio
Mass flow rate
Change in load

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Compressors, Gas Turbines and Jet Engines
In a closed cycle gas turbine, the air is compressed

Isentropically
Isothermally
None of these
Polytropically

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

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

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Compressors, Gas Turbines and Jet Engines
The thrust of a jet propulsion power unit can be increased by

Burning fuel after gas turbine
Injecting water into the compressor
Injecting ammonia into the combustion chamber
All of these

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Compressors, Gas Turbines and Jet Engines
Which is false statement about air receivers?

These act as reservoir to take care of sudden demands
These knock out some oil and moisture
These are used to dampen pulsations
These increase compressor efficiency

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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

0.005
0.001
0.01
0.05

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MORE MCQ ON Compressors, Gas Turbines and Jet Engines

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