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Compressors, Gas Turbines and Jet Engines

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

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

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Compressors, Gas Turbines and Jet Engines
Reheating in a gas turbine

Decreases the thermal efficiency
Increases the compressor work
Increases the turbine work
Increases the thermal efficiency

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Compressors, Gas Turbines and Jet Engines
The type of rotary compressor used in aeroplanes, is of

Axial flow type
Radial flow type
Centrifugal type
None of these

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Compressors, Gas Turbines and Jet Engines
The pressure and temperature conditions of air at the suction of compressor are

Pressure slightly less than atmospheric and temperature slightly more than atmospheric
Atmospheric
Slightly less than atmospheric
Slightly more than atmospheric

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Compressors, Gas Turbines and Jet Engines
In a single stage, single acting reciprocating air compressor without clearance volume, the work-done is maximum during

None of these
Isothermal compression
Polytropic compression
Isentropic compression

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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
It is impossible in practice
Compressor has to run at very slow speed to achieve it
It requires very big cylinder

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MORE MCQ ON Compressors, Gas Turbines and Jet Engines

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