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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The air is delivered ________ in one revolution in case of a three lobbed rotor.

Six times
Three times
Four times
Two times

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Compressors, Gas Turbines and Jet Engines
Phenomenon of choking in compressor means

No flow of air
Increased inclination of chord with air steam
Fixed mass flow rate regardless of pressure ratio
Reducing mass flow rate with increase in pressure ratio

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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

Remain same
Increase
Decrease
None of these

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Compressors, Gas Turbines and Jet Engines
The fuel consumption in gas turbines is accounted for by

Higher heating value
Lower heating value
Higher calorific value
Heating value

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Compressors, Gas Turbines and Jet Engines
Standard air is the air at ___ and relative humidity of 36 percent.

1 bar and 20°C
1 bar and 40°C
0.1 bar and 20°C
0.1 bar and 40°C

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Compressors, Gas Turbines and Jet Engines
Maximum temperature in a gas turbine is of the order of

1500°C
2000°C
1000°C
700°C

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