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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The gas in cooling chamber of a closed cycle gas turbine is cooled at

Constant temperature
Constant pressure
Constant volume
None of the listed here

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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
The ratio of the indicated power to the shaft power or brake power of the motor or engine required to drive the compressor, is called

Compressor efficiency
Mechanical efficiency
Isothermal efficiency
Volumetric efficiency

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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 volumetric efficiency of a compressor falls roughly as follows for every 5°C increase in atmospheric temperature

0.01
0.05
0.005
0.001

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Compressors, Gas Turbines and Jet Engines
The work done per unit mass of air in compression will be least when 'n' is equal to

1
1.3
1.4
1.2

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