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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

0.6
0.34
0.72
0.5

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Compressors, Gas Turbines and Jet Engines
In a jet propulsion unit, the products of combustion after passing through the gas turbine are discharged into

Discharge nozzle
Atmosphere
Vacuum
Back to the compressor

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

Two times
Four times
Six times
Three times

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Compressors, Gas Turbines and Jet Engines
Ratio of indicated h.p. to shaft h.p. in known as

Compressor efficiency
Isothermal efficiency
Volumetric efficiency
Mechanical efficiency

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Compressors, Gas Turbines and Jet Engines
The efficiency of roots blower ________ with the increase in pressure ratio.

Increases
None of these
Decreases
Does not change

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Compressors, Gas Turbines and Jet Engines
Gas turbines use following type of air compressor

Reciprocating type
Lobe type
Axial flow type
Centrifugal type

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