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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
For perfect intercooling in a two stage compressor

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

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

Mechanical efficiency
Volumetric efficiency
Isothermal efficiency
Adiabatic efficiency

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Compressors, Gas Turbines and Jet Engines
The efficiency of the vane blower is (where W₁ = Workdone due to compression, and W₂ = Workdone due to back flow)

W₁/(W₁ + W₂)
(W₁ + W₂)/W₁
W₂/(W₁ + W₂)
(W₁ + W₂)/W₂

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Compressors, Gas Turbines and Jet Engines
For a two stage compressor, if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will

Remain unaffected
Increase
Other factors control it
Decrease

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Compressors, Gas Turbines and Jet Engines
The effective power of gas turbines is increased by adding the following in compressor

Nitrogen
Hydrogen
Ammonia and water vapour
Carbon dioxide

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Compressors, Gas Turbines and Jet Engines
In a single stage, single acting reciprocating air compressor without clearance volume, the work-done is maximum during

Polytropic compression
Isothermal compression
None of these
Isentropic compression

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MORE MCQ ON Compressors, Gas Turbines and Jet Engines

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