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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
Axial flow compressor resembles

Sliding vane compressor
Reciprocating pump
Turbine
Centrifugal pump

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Compressors, Gas Turbines and Jet Engines
The ratio of isentropic work to Euler’s work is known as

Isentropic efficiency
Pressure coefficient
Euler
Compressor efficiency

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Compressors, Gas Turbines and Jet Engines
High air-fuel ratio in gas turbines

Reduces exhaust temperature
Improves thermal efficiency
Increases power output
Do not damage turbine blades

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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
Less
More/less depending on compressor capacity
Same

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

Does not change
None of these
Decreases
Increases

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

Both (A) and (B) above
Decrease of thermal efficiency
Increase of work ratio
Decrease of work ratio

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