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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
A simple turbojet engine is basically

Gas turbine engine equipped with a propulsive nozzle and diffuse
A propeller system
Chemical rocket engine
Ramjet engine

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Compressors, Gas Turbines and Jet Engines
Free air is the air at

15°C and 1 kg/cm²
0°C and standard atmospheric conditions
Atmospheric conditions at any specific location
20°C and 1 kg/cm² and relative humidity of 36%

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

0.41736111111111
0.83402777777778
2.5006944444444
0.62569444444444

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Compressors, Gas Turbines and Jet Engines
The process, which causes the air to enter the impeller blades of a centrifugal compressor at ________ velocity (without effecting the mass of air to flow and velocity of flow) is known as prewhirl.

None of these
Reduced
Increased
Zero

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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

Increase
None of these
Decrease
Remain same

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Compressors, Gas Turbines and Jet Engines
Aeroplanes employ following type of compressor

None of these
Axial flow
Centrifugal
Radial flow

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