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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The minimum work required for a three stage reciprocating air compressor is ___ the work required for each stage.

Three times
Equal to
Six times
Double

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Compressors, Gas Turbines and Jet Engines
Free air is the air at

20°C and 1 kg/cm² and relative humidity of 36%
Atmospheric conditions at any specific location
0°C and standard atmospheric conditions
15°C and 1 kg/cm²

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Compressors, Gas Turbines and Jet Engines
Isothermal compression though most efficient, but is not practicable because

It does not increase pressure much
Compressor has to run at very slow speed to achieve it
It requires very big cylinder
It is impossible in practice

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Compressors, Gas Turbines and Jet Engines
The compressor efficiency is the

Total output/air input
Compression work/motor input
Isothermal H.P/indicated H.R
Isothermal H.P./shaft H.R

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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
None of the listed here
Higher thrust
Low frontal area

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Compressors, Gas Turbines and Jet Engines
The air power of the compressor is also known as

Brake power
Frictional power
Indicated power
None of these

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