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Compressors, Gas Turbines and Jet Engines

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-1/ɣ
1 - (1/r) ɣ/ɣ-1
r ɣ-1

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Compressors, Gas Turbines and Jet Engines
Pick up wrong statement. Surging phenomenon in centrifugal compressor depends on

Pressure ratio
Change in load
Mass flow rate
Stagnation pressure at the outlet

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Compressors, Gas Turbines and Jet Engines
The pressure ratio in gas turbines is of the order of

0.16736111111111
0.37569444444444
2.5423611111111
0.084027777777778

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Compressors, Gas Turbines and Jet Engines
Atmospheric pressure is 1.03 kg/cm and vapour pressure is 0.03 kg/cm. The air pressure will be

1.06 kg/cm²
0.53 kg/cm²
1.03 kg/cm²
1.00 kg/cm²

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Compressors, Gas Turbines and Jet Engines
A simple turbojet engine is basically

Chemical rocket engine
Ramjet engine
A propeller system
Gas turbine engine equipped with a propulsive nozzle and diffuse

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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 are used to dampen pulsations
These increase compressor efficiency
These act as reservoir to take care of sudden demands

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MORE MCQ ON Compressors, Gas Turbines and Jet Engines

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