Discussion
Which of the following is not a nozzle coefficient?
Coefficient of reaction
Coefficient of discharge
Coefficient of velocity
Coefficient of thrust
Answer: C
Correct answer: Coefficient of reaction
There is no such nozzle coefficient. The three in use are the coefficient of discharge, comparing actual with ideal mass flow; the coefficient of velocity, comparing actual with ideal exit velocity; and the coefficient of thrust, comparing actual with ideal thrust. Degree of reaction is a real quantity, but it belongs to turbine and compressor stage design, describing how the pressure drop is shared between rotor and stator.
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