Hydraulics and Fluid Mechanics in ME
Manometric head, in case of a centrifugal pump, is equal to

Work-done per kN of water Losses within the impeller
Energy per kN at outlet of impeller Energy per kN at inlet of impeller
All of these
Suction lift + Loss of head in suction pipe due to friction + Delivery lift + Loss of head in delivery pipe due to friction + Velocity head in the delivery pipe

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Hydraulics and Fluid Mechanics in ME
Coefficient of resistance is the ratio of

Actual velocity of jet at vena-contracta to the theoretical velocity
Area of jet at vena-contracta to the area of orifice
Actual discharge through an orifice to the theoretical discharge
Loss of head in the orifice to the head of water available at the exit of the orifice

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