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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The ratio of isentropic work to Euler’s work is known as

Compressor efficiency
Pressure coefficient
Isentropic efficiency
Euler

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Compressors, Gas Turbines and Jet Engines
In a compressor, free air delivered is the actual volume delivered at the stated pressure reduced to

Intake temperature and pressure conditions
20°C and 1 kg/cm²
0°C and 1 kg/cm²
N.T.P. conditions

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Compressors, Gas Turbines and Jet Engines
During peak load periods, the best method of controlling compressors is

Constant speed unloader
Start-stop motor
Variable speed
Relief valve

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Compressors, Gas Turbines and Jet Engines
Volumetric efficiency of air compressors is of the order of

40 - 50%
20 - 30%
70 - 90%
60 - 70%

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Compressors, Gas Turbines and Jet Engines
A 3 m³/min compressor means that it

Compresses 3 m³/min of standard air
Compresses 3 m³/ min of free air
Delivers 3 m³/ min of compressed air at delivery pressure
Delivers 3 m³/ min of compressed air

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Compressors, Gas Turbines and Jet Engines
Which of the following fuels can be used in turbojet engines?

High speed diesel oil
Liquid hydrogen
Kerosene
Methyl alcohol

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