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The stage efficiency (ηS) is given by (where ηB = Blading efficiency, and ηN = Nozzle efficiency)
ηS = ηB × ηN
ηS = ηB / ηN
ηS = ηN / ηB
None of these
ηS = ηB × ηN
ηS = ηB / ηN
ηS = ηN / ηB
None of these