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Compressors, Gas Turbines and Jet Engines

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

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

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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 - r ɣ-1
r ɣ-1
1 - (1/r) ɣ-1/ɣ

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Compressors, Gas Turbines and Jet Engines
In jet propulsion power unit, the inlet duct of diverging shape is used in order to

Collect more air
Convert kinetic energy of air into pressure energy
Provide robust structure
Beautify the shape

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Compressors, Gas Turbines and Jet Engines
Which is false statement about air receivers?

These increase compressor efficiency
These act as reservoir to take care of sudden demands
These are used to dampen pulsations
These knock out some oil and moisture

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Compressors, Gas Turbines and Jet Engines
The thermal efficiency of a simple gas turbine for a given turbine inlet temperature with increase in pressure ratio

Decreases
First decreases and then increases
Increases
First increases and then decreases

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Compressors, Gas Turbines and Jet Engines
It is not possible to use closed gas turbine cycle in aeronautical engines because

It is inefficient
None of these
It requires cooling water for its operation
It is bulky

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