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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
Cylinder clearance in a compressor should be

About 100% of swept volume
About 50% of swept volume
As large as possible
As small as possible

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Compressors, Gas Turbines and Jet Engines
High air-fuel ratio in gas turbines

Do not damage turbine blades
Reduces exhaust temperature
Improves thermal efficiency
Increases power output

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Compressors, Gas Turbines and Jet Engines
Only rocket engines can be propelled to space because

They have high propulsion efficiency
They can generate very high thrust
These engines can work on several fuels
They are not air breathing engines

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

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

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Compressors, Gas Turbines and Jet Engines
The pressure ratio of an ideal vaned compressor with increase in mass flow rate

Increases
First decreases and then increases
Decreases
Remain constant

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

Ramjet engine
Turbojet engine
Propellers
Rockets

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MORE MCQ ON Compressors, Gas Turbines and Jet Engines

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