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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The gas in cooling chamber of a closed cycle gas turbine is cooled at

Constant pressure
None of the listed here
Constant volume
Constant temperature

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Compressors, Gas Turbines and Jet Engines
Isothermal compression efficiency, even when running at high speed, can be approached by using

Both (A) and (B) above
Fully insulating the cylinder
Cold water spray
Multistage compression

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Compressors, Gas Turbines and Jet Engines
Pressure ratio in gas turbines is the ratio of

Pressures across the turbine
Inlet pressure to exhaust pressure
Highest pressure to exhaust pressure
Compressor pressure ratio

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Compressors, Gas Turbines and Jet Engines
The thermodynamic efficiency of rotary compressor is based on

Isothermal compression
Adiabatic compression
Isentropic compression
Polytropic compression

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Compressors, Gas Turbines and Jet Engines
There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would

Remain same
Increase
None of these
Decrease

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Compressors, Gas Turbines and Jet Engines
For supplying intermittent small quantity of air at high pressure, following compressor is best suited

Axial
Centrifugal
Reciprocating
Screw

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