Various efficiencies of a centrifugal pump are related as (where, εm = mechanical efficiency εv = volumetric efficiency. εma = manometric efficiency εo = overall efficiency) ?
A. ηma × ηm × ηv = ηo
B. ηm = ηv . ηma
C. ηma = ηm × ηv
D. ηv = ηm × ηma