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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
Isothermal compression efficiency, even when running at high speed, can be approached by using

Fully insulating the cylinder
Cold water spray
Both (A) and (B) above
Multistage compression

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Compressors, Gas Turbines and Jet Engines
Efficiency of gas turbine is increased by

All of the listed here
Inter cooling
Adding a regenerator
Reheating

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Compressors, Gas Turbines and Jet Engines
If the clearance ratio for a reciprocating air compressor is 'K', then its volumetric efficiency is given by

1 + k - k (p₂/p₁)1/n
1 + k - k (p₂/p₁) n-1/n
1 - k + k (p₁/p₂)1/n
1 - k + k (p₁/p₂) n- 1/n

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Compressors, Gas Turbines and Jet Engines
The maximum temperature in a gas turbine is

500°C
700°C
200°C
1000°C

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Compressors, Gas Turbines and Jet Engines
A simple turbojet engine is basically

Gas turbine engine equipped with a propulsive nozzle and diffuse
Ramjet engine
Chemical rocket engine
A propeller system

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Compressors, Gas Turbines and Jet Engines
The compressed air may be used

All of the listed here
In gas turbine plants
For operating pneumatic drills
In starting and supercharging of I.C. engines

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