The stage efficiency (ηS) is given by (where ηB = Blading efficiency – McqOptions

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1.	The stage efficiency (ηS) is given by (where ηB = Blading efficiency, and ηN = Nozzle efficiency)
A.	S = ηB × ηN
B.	S = ηB / ηN
C.	S = ηN / ηB
D.	one of these
Answer» B. S = ηB / ηN

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