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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
With the decrease in compression ratio, the volumetric efficiency

Decreases
First decrease and then increase
Increases
Does not change

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Compressors, Gas Turbines and Jet Engines
Isothermal compression efficiency, even when running at high speed, can be approached by using

Multistage compression
Cold water spray
Fully insulating the cylinder
Both (A) and (B) above

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Compressors, Gas Turbines and Jet Engines
Pick up the wrong statement about advantages of multistage compression

Better lubrication is possible advantages of multistage
More loss of air due to leakage past the cylinder
Air can be cooled perfectly in between
Mechanical balance is better

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Compressors, Gas Turbines and Jet Engines
In jet engines, for the efficient production of large power, fuel is burnt in an atmosphere of

Vacuum
Atmospheric air
Compressed air
Oxygen alone

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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)

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

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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
More
Same
More/less depending on compressor capacity

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MORE MCQ ON Compressors, Gas Turbines and Jet Engines

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