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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The propulsive power of the rocket is (where v₁ = Jet velocity, and v₂ = Aircraft velocity)

(v₁² -v₂²)/2g
(v₁² -v₂²)/g
(v₁ - v₂)²/2g
(v₁ - v₂)²/g

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Compressors, Gas Turbines and Jet Engines
Work ratio of a gas turbine plant is ratio of

Work done by turbine and heat supplied
Net work output and heat supplied
Work done by turbine and net work output
Net work output and work done by turbine

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Compressors, Gas Turbines and Jet Engines
Propulsion efficiency of the following order is obtained in practice

0.5
0.72
0.6
0.34

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Compressors, Gas Turbines and Jet Engines
The work-done on a compressor will be minimum if air is taken from

The atmosphere
A source of low temperature air
A source at 0° C
A source of high temperature air

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Compressors, Gas Turbines and Jet Engines
In jet engines, paraffin is usually used as the fuel because of its

High calorific value
Both (A) and (C) above
Ease of atomisation
Low freezing point

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Compressors, Gas Turbines and Jet Engines
The work ratio of simple gas turbine cycle depends on

Pressure ratio
All of these
Minimum cycle temperature
Maximum cycle temperature

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