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Compressors, Gas Turbines and Jet Engines

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

0.34
0.72
0.5
0.6

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Compressors, Gas Turbines and Jet Engines
The air is delivered ________ in one revolution in case of a three lobbed rotor.

Four times
Two times
Three times
Six times

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Compressors, Gas Turbines and Jet Engines
In a single acting reciprocating compressor, the suction, compression and delivery of air takes place in ________ of the piston.

Three strokes
Four strokes
One stroke
Two strokes

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Compressors, Gas Turbines and Jet Engines
Maximum temperature in a gas turbine is of the order of

700°C
1500°C
1000°C
2000°C

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

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

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Compressors, Gas Turbines and Jet Engines
Reheating in multistage expansion gas turbine results in

Decrease of heat loss in exhaust
Reduction in compressor work
Maximum work output
High thermal efficiency

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