Compressors, Gas Turbines and Jet Engines
If V, U and Vr represent the absolute velocity of fluid, velocity of blade, and relative velocity of fluid, and suffix ‘I’ and ‘o’ stand for entry and exit conditions, then in a rotary machine whose degree of reaction is unity

V = Uo
Vi = Vo
Vt > Vo
U < Vo

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Compressors, Gas Turbines and Jet Engines
The compressor capacity is defined as the

Actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions
Volume of air delivered by the compressor
None of these
Volume of air sucked by the compressor during its suction stroke

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