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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
In gas turbines, high thermal efficiency is obtained in

Open cycle
Closed cycle & Open cycle
Closed/open depending on other considerations
Closed cycle

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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)/g
(v₁² -v₂²)/2g
(v₁ - v₂)²/2g

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Compressors, Gas Turbines and Jet Engines
A large clearance volume in a reciprocating compressor results in

Lower delivery pressure
Increased volume flow rate
Lower suction pressure
Reduced volume flow rate

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Compressors, Gas Turbines and Jet Engines
Volumetric efficiency of a compressor decreases with ________ in compression ratio.

Does not change
Remain same
Decrease
Increase

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Compressors, Gas Turbines and Jet Engines
Air-fuel ratio in a jet engine will be of the order of

2.5006944444444
0.62569444444444
0.83402777777778
0.41736111111111

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Compressors, Gas Turbines and Jet Engines
A gas turbine used in air craft should have

Low weight and small frontal area
High speed and high h.p.
High h.p. and low weight
Small frontal area and high h.p.

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