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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The volumetric efficiency for reciprocating air compressors is about

60 to 70%
40 to 60%
70 to 90%
10 to 40%

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

Cool the air
Cause moisture and oil vapour to drop out
Reduce volume of air
Remove impurities from air

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

15: 1
30: 1
7: 1
50: 1.

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Compressors, Gas Turbines and Jet Engines
The propulsive power of the rocket is (where v₁ = Jet velocity, and v₂ = Aircraft velocity)

(v₁ - v₂)²/g
(v₁² -v₂²)/2g
(v₁ - v₂)²/2g
(v₁² -v₂²)/g

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Compressors, Gas Turbines and Jet Engines
Water is injected in gas turbine cycle to

Control temperature
Control fire hazards
Increase efficiency
Control output of turbine

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Compressors, Gas Turbines and Jet Engines
The pressure of air at the beginning of the compression stroke is ___ the atmospheric pressure.

More than
Equal to
Less than
None of the listed here

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