Various efficiencies of a centrifugal pump are related as (where, ηₘ = mechanical efficiency ηᵥ = volumetric efficiency. ηₘₐ = manometric efficiency ηₒ = overall efficiency)

• A. ηₘₐ x ηₘ x ηᵥ = ηₒ
• B. ηₘ = ηᵥ . ηₘₐ
• C. ηₘₐ = ηₘ x ηᵥ
• D. ηᵥ = ηₘ x ηₘₐ