Compressors, Gas Turbines and Jet Engines
Ratio of compression is the ratio of

Pressures at discharge and suction corresponding to same temperature
Gauge discharge pressure to the gauge intake pressure
Absolute discharge pressure to the absolute intake pressure
Stroke volume and clearance volume

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Compressors, Gas Turbines and Jet Engines
In n₁ and n₂ are the indices of compression for the first and second stage of compression, then the ratio of work-done on the first and second stages (W₁/W₂) with perfect intercooling is given by

W₁/W₂ = n₂(n₁ - 1)/n₁(n₂ - 1)
W₁/W₂ = n₁/n₂
W₁/W₂ = n₁(n₂ - 1)/n₂(n₁ - 1)
W₁/W₂ = n₂/n₁

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Compressors, Gas Turbines and Jet Engines
Which of the following statement is correct as regard to centrifugal compressors?

The maximum efficiency is higher than multistage axial flow compressors
The flow of air is parallel to the axis of the compressor
The static pressure of air in the impeller increases in order to provide centripetal force on the air
The impeller rotates at high speeds

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Compressors, Gas Turbines and Jet Engines
In a jet propulsion

The propulsive matter is ejected from within the propelled body
The propulsive matter is caused to flow around the propelled body
Its functioning does not depend upon presence of air
None of these

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