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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The volumetric efficiency of a compressor falls roughly as follows for every 100 m increase in elevation

0.5%
5%
0.1%
1.0%

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Compressors, Gas Turbines and Jet Engines
The work done per unit mass of air in compression will be least when 'n' is equal to

1.4
1.3
1.2
1

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Compressors, Gas Turbines and Jet Engines
During base load operation, the best method of controlling compressor is

Variable speed
Constant speed unloader
Relief valve
Start-stop motor

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

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Compressors, Gas Turbines and Jet Engines
The criterion of the thermodynamic efficiency for rotary compressor is

None of the listed here
Isentropic compression
Polytropic compression
Isothermal compression

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Compressors, Gas Turbines and Jet Engines
Separators are generally used in air compressor installations

Before the inter-cooler
Between the after-cooler and receiver
After the inter-cooler
Before first stage suction

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