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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
In jet engines the products of combustion after passing through the gas turbine are discharged into

Atmosphere
Discharge nozzle
Vacuum
Back to the compressor

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Compressors, Gas Turbines and Jet Engines
Stalling of blades in axial flow compressor is the phenomenon of

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

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Compressors, Gas Turbines and Jet Engines
There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would

Decrease
Remain same
Increase
None of these

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Compressors, Gas Turbines and Jet Engines
If V, U and Vr represent the absolute velocity of fluid, velocity of blade, and relative velocity of fluid, and suffix ‘I’ and ‘o’ stand for entry and exit conditions, then in a rotary machine whose degree of reaction is unity

V = Uo
Vi = Vo
U < Vo
Vt > Vo

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Compressors, Gas Turbines and Jet Engines
Rotary compressors are used for delivering

Small quantities of air at low pressures
Large quantities of air at low pressures
Large quantities of air at high pressures
Small quantities of air at high pressures

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Compressors, Gas Turbines and Jet Engines
The clearance volume of the air compressor is kept minimum because

It permits isothermal compression
It allows maximum compression to be achieved
It greatly affects volumetric efficiency
It results in minimum work

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