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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

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

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Compressors, Gas Turbines and Jet Engines
The axial flow compressor is preferred in aircraft gas turbines because of

High pressure rise
Higher thrust
None of the listed here
Low frontal area

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Compressors, Gas Turbines and Jet Engines
As the turbine inlet temperature increases, the thermal efficiency of gas turbine for the optimum pressure ratio

First increases and then decreases
Decreases
Remain same
Increases

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Compressors, Gas Turbines and Jet Engines
Adiabatic compression is one in which

Work done is maximum
Temperature rise follows a linear relationship
Temperature during compression remains constant
No heat leaves or enters the compressor cylinder during compression

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Compressors, Gas Turbines and Jet Engines
In turbo fan engine, the jet velocity as compared to turbojet engine is

May be less or more depending upon speed
Less
Same
More

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Compressors, Gas Turbines and Jet Engines
The overall thermal efficiency of an ideal gas turbine plant is (where r = Pressure ratio)

1 - (1/r) ɣ/ɣ-1
1 - (1/r) ɣ-1/ɣ
r ɣ-1
1 - r ɣ-1

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