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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
A rocket works with maximum overall efficiency when air craft velocity is equal to the

Average of the jet velocity
Jet velocity
Half the jet velocity
Twice the jet velocity

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Compressors, Gas Turbines and Jet Engines
In a centrifugal compressor, an increase in speed at a given pressure ratio causes

Increase in flow
Increase in efficiency
Increase in flow and decrease in efficiency
Decrease in flow

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Compressors, Gas Turbines and Jet Engines
The volumetric efficiency for reciprocating air compressors is about

60 to 70%
10 to 40%
70 to 90%
40 to 60%

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Compressors, Gas Turbines and Jet Engines
A closed cycle gas turbine consists of a

Heating chamber
All of these
Compressor
Cooling chamber

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Compressors, Gas Turbines and Jet Engines
Which is false statement about multistage compression?

Power consumption per unit of air delivered is low
Volumetric efficiency is high
It is best suited for compression ratios around 7:1
The moisture in air is condensed in the inter-cooler

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Compressors, Gas Turbines and Jet Engines
Which is false statement about air receivers?

These knock out some oil and moisture
These act as reservoir to take care of sudden demands
These are used to dampen pulsations
These increase compressor efficiency

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