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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
Change in load
Mass flow rate
Pressure ratio

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Compressors, Gas Turbines and Jet Engines
Aeroplanes employ following type of compressor

Centrifugal
Axial flow
Radial flow
None of these

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Compressors, Gas Turbines and Jet Engines
The inter-cooler pressure, for minimum work required, for a two stage reciprocating air compressor, is given by (where p₁ = Intake pressure of air, p₂ = Inter-cooler pressure, and p₃ = Delivery pressure of air)

p₂ = p₁ × p₃
p₂ = p₁/p₃
p₂ = p₃/p₁
p₂ = p₁ × p₂

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Compressors, Gas Turbines and Jet Engines
The performance of air compressor at high altitudes will be ________ as compared to that at sea level.

Same
Higher
Lower
None of these

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Compressors, Gas Turbines and Jet Engines
Reheating in a multistage expansion gas turbine ________ compressor work.

Has no effect on
None of these
Increases
Decreases

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Compressors, Gas Turbines and Jet Engines
A rocket works with maximum overall efficiency when air craft velocity is equal to the

Average of the jet velocity
Half the jet velocity
Jet velocity
Twice the jet velocity

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