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Compressors, Gas Turbines and Jet Engines

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
A gas turbine used in air craft should have

High speed and high h.p.
Low weight and small frontal area
High h.p. and low weight
Small frontal area and high h.p.

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

700°C
1000°C
1500°C
2000°C

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Compressors, Gas Turbines and Jet Engines
Gas turbine cycle with regenerator

Allows high compression ratio
Increases thermal efficiency
Allows operation at very high altitudes
Decreases heat loss is exhaust

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Compressors, Gas Turbines and Jet Engines
Surging is the phenomenon of

Air stream blocking the passage
Unsteady, periodic and reversed flow
Air stream not able to follow the blade contour
Motion of air at sonic velocity

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Compressors, Gas Turbines and Jet Engines
The ratio of work done per cycle to the swept volume in case of compressor is called

Compression index
Compression ratio
Mean effective pressure
Compressor efficiency

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MORE MCQ ON Compressors, Gas Turbines and Jet Engines

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