Hydraulics and Fluid Mechanics in ME
Coefficient of velocity is defined as the ratio of

Area of jet at vena contracta to the area of orifice
Actual velocity of jet at vena contracta to the theoretical velocity
Actual discharge through an orifice to the theoretical discharge
None of these

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

Energy per kN at outlet of impeller Energy per kN at inlet of impeller
Work-done per kN of water Losses within the impeller
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
All of these

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