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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The material commonly used for air craft gas turbine is

Stainless steel
Duralumin
Timken, Haste alloys
High alloy steel

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

Fatigue
Toughness
Corrosion resistance
Creep

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Compressors, Gas Turbines and Jet Engines
Gas turbine as compared to internal combustion engine

All of the listed here
Can be driven at a very high speed
Has more efficiency
Produces uniform torque

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Compressors, Gas Turbines and Jet Engines
Ratio of indicated H.P. and brake H.P. is known as

Adiabatic efficiency
Mechanical efficiency
Volumetric efficiency
Isothermal efficiency

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Compressors, Gas Turbines and Jet Engines
If the clearance ratio for a reciprocating air compressor is 'K', then its volumetric efficiency is given by

1 + k - k (p₂/p₁)1/n
1 + k - k (p₂/p₁) n-1/n
1 - k + k (p₁/p₂) n- 1/n
1 - k + k (p₁/p₂)1/n

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Compressors, Gas Turbines and Jet Engines
Reheating in multistage expansion gas turbine results in

Decrease of heat loss in exhaust
Reduction in compressor work
Maximum work output
High thermal efficiency

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MORE MCQ ON Compressors, Gas Turbines and Jet Engines

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