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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
Propulsion efficiency of the following order is obtained in practice

0.6
0.34
0.72
0.5

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Compressors, Gas Turbines and Jet Engines
Reheating in a gas turbine

Increases the compressor work
Decreases the thermal efficiency
Increases the thermal efficiency
Increases the turbine work

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Compressors, Gas Turbines and Jet Engines
A compressor at high altitude will draw

More/less power depending on other factors
Less power
Same power
More power

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Compressors, Gas Turbines and Jet Engines
In a single stage, single acting reciprocating air compressor, without clearance, the work-done on the air during isentropic compression is ________ the heat required to raise the temperature of air from T₁ to T₂ at a constant pressure.

Less than
None of these
Equal to
Greater than

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

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

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Compressors, Gas Turbines and Jet Engines
The following property is most important for material used for gas turbine blade

Toughness
Creep
Fatigue
Corrosion resistance

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