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COMPRESSORS, GAS TURBINES AND JET ENGINES

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
Multistage compression
Cold water spray
Fully insulating the cylinder

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Compressors, Gas Turbines and Jet Engines
A rotary compressor is driven by an

Electric motor
None of these
Engine
Either (A) or (B)

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Compressors, Gas Turbines and Jet Engines
Ramjet engine

Requires no air for its operation
Is not self operating at zero flight speed
Produces a jet consisting of plasma
Is self operating at zero flight speed

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Compressors, Gas Turbines and Jet Engines
In the aircraft propellers

All of these
Propulsive matter is ejected from within the propelled body
Its functioning does not depend on presence of air
The propulsive matter is caused to flow around the propelled body

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Compressors, Gas Turbines and Jet Engines
If V, U and Vr represent the absolute velocity of fluid, velocity of blade, and relative velocity of fluid, and suffix ‘I’ and ‘o’ stand for entry and exit conditions, then in a rotary machine whose degree of reaction is unity

U < Vo
Vi = Vo
Vt > Vo
V = Uo

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