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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
For speed above 3000 km/hour, it is more advantageous to use

Turbojet engine
Ramjet engine
Rockets
Propellers

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Compressors, Gas Turbines and Jet Engines
The ratio of work-done per cycle to the stroke volume of the compressor is known as

Mean effective pressure
Compressor capacity
Compression ratio
Compressor 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

Increase
Remain same
None of these
Decrease

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

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

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Compressors, Gas Turbines and Jet Engines
Temperature of gases at end of compression as compared to exhaust gases in a gas turbine is

Higher
Equal
Lower
Can't be compared

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Compressors, Gas Turbines and Jet Engines
The compression ratio in a gas turbine is of the order of

0.20902777777778
0.50069444444444
0.33402777777778
3.5 : 1

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