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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
In a jet engine, the air-fuel ratio is

2.5006944444444
1.2506944444444
2.0840277777778
1.6673611111111

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Compressors, Gas Turbines and Jet Engines
The minimum work required for a three stage reciprocating air compressor is ___ the work required for each stage.

Six times
Three times
Equal to
Double

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Compressors, Gas Turbines and Jet Engines
The volumetric efficiency of a compressor falls roughly as follows for every 100 m increase in elevation

5%
1.0%
0.1%
0.5%

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Compressors, Gas Turbines and Jet Engines
After-cooler is used to

Decrease the delivery temperature for ease in handling
Cause moisture and oil vapour to drop out
Cool the air
Reduce volume

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Compressors, Gas Turbines and Jet Engines
Isothermal compression efficiency can be attained by running the compressor

At very slow speed
At very high speed
At zero speed
At average speed

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Compressors, Gas Turbines and Jet Engines
The area of actual indicator diagram on an air compressor as compared to area of ideal indicator diagram is

More
Same
More/less depending on compressor capacity
Less

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