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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The maximum propulsion efficiency of a turbojet is attained at around following speed

550 km/hr
1700 km/hr
2400 km/hr
1050 km/hr

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Compressors, Gas Turbines and Jet Engines
The inter-cooler pressure, for minimum work required, for a two stage reciprocating air compressor, is given by (where p₁ = Intake pressure of air, p₂ = Inter-cooler pressure, and p₃ = Delivery pressure of air)

p₂ = p₁ × p₂
p₂ = p₁/p₃
p₂ = p₁ × p₃
p₂ = p₃/p₁

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Compressors, Gas Turbines and Jet Engines
Adiabatic compression is one in which

Temperature during compression remains constant
Temperature rise follows a linear relationship
No heat leaves or enters the compressor cylinder during compression
Work done is maximum

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Compressors, Gas Turbines and Jet Engines
The area of actual indicator diagram on an air compressor as compared to area of ideal indicator diagram is

More/less depending on compressor capacity
More
Less
Same

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

Corrosion resistance
Creep
Fatigue
Toughness

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Compressors, Gas Turbines and Jet Engines
Work ratio of a gas turbine may be improved by

Increasing the compression work
Both (A) and (C) above
Decreasing the compression work
Increasing the turbine work

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