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Compressors, Gas Turbines and Jet Engines

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

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

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Compressors, Gas Turbines and Jet Engines
Cylinder clearance in a compressor should be

About 100% of swept volume
About 50% of swept volume
As large as possible
As small as possible

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Compressors, Gas Turbines and Jet Engines
The overall thermal efficiency of an ideal gas turbine plant is (where r = Pressure ratio)

1 - r ɣ-1
1 - (1/r) ɣ/ɣ-1
r ɣ-1
1 - (1/r) ɣ-1/ɣ

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Compressors, Gas Turbines and Jet Engines
Maximum delivery pressure is a rotary air compressor is of the order of

25 kg/cm²
6 kg/cm²
10 kg/cm²
16 kg/cm²

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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

Less
Same
More
More/less depending on compressor capacity

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Compressors, Gas Turbines and Jet Engines
Reciprocating air compressor is best suited for

Small quantity of air at low pressure
Small quantity of air at high pressure
Large quantity of air at low pressure
Large quantity of air at high pressure

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