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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
In a centrifugal compressor, the ratio of the ________ to the blade velocity is called slip factor.

Inlet velocity of flow
Outlet whirl velocity
Outlet velocity of flow
Inlet whirl velocity

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

Decrease
Does not change
Remain same
Increase

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Compressors, Gas Turbines and Jet Engines
For supplying intermittent small quantity of air at high pressure, following compressor is best suited

Axial
Reciprocating
Screw
Centrifugal

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Compressors, Gas Turbines and Jet Engines
In open cycle turbojet engines used in military aircraft, reheating the exhaust gas from the turbine by burning, more fuel is used to increase the

Both (A) and (B)
None of these
Thrust and range of aircraft
Efficiency of the engine

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Compressors, Gas Turbines and Jet Engines
The overall thermal efficiency of an ideal gas turbine plant is (where r = Pressure ratio)

1 - (1/r) ɣ-1/ɣ
r ɣ-1
1 - (1/r) ɣ/ɣ-1
1 - r ɣ-1

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Compressors, Gas Turbines and Jet Engines
A turboprop is preferred to turbojet because

It has high power for take off
It can fly at high elevations
It can fly at supersonic speeds
It has high propulsive efficiency at high speeds

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