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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
A rocket engine uses __________ for the combustion of its fuel.

Surrounding air
None of these
Its own oxygen
Compressed atmospheric air

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Compressors, Gas Turbines and Jet Engines
Surging is the phenomenon of

Air stream not able to follow the blade contour
Motion of air at sonic velocity
Air stream blocking the passage
Unsteady, periodic and reversed flow

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Compressors, Gas Turbines and Jet Engines
The work-done on a compressor will be minimum if air is taken from

A source of low temperature air
The atmosphere
A source of high temperature air
A source at 0° C

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

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Compressors, Gas Turbines and Jet Engines
Gas turbine blades are given a rake

Depending on the velocity
Opposite to the direction of motion of blades
In the direction of motion of blades
Equal to zero

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Compressors, Gas Turbines and Jet Engines
The capacity of a compressor is expressed in

kg/m³
kg/m²
m³/min
m³/kg

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