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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The effective power of gas turbines is increased by adding the following in compressor

Nitrogen
Hydrogen
Ammonia and water vapour
Carbon dioxide

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Compressors, Gas Turbines and Jet Engines
In a four stage compressor, if the pressure at the first and third stage is 1 bar and 16 bar, then the delivery pressure at the fourth stage will be

16 bar
1 bar
256 bar
64 bar

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Compressors, Gas Turbines and Jet Engines
The clearance volume of the air compressor is kept minimum because

It permits isothermal compression
It allows maximum compression to be achieved
It results in minimum work
It greatly affects volumetric efficiency

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Compressors, Gas Turbines and Jet Engines
Mechanical efficiency of gas turbines as compared to I.C engines is

Higher
Same
None of these
Lower

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Compressors, Gas Turbines and Jet Engines
In a centrifugal compressor, the ratio of the ________ to the blade velocity is called slip factor.

Inlet whirl velocity
Inlet velocity of flow
Outlet whirl velocity
Outlet velocity of flow

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

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