Hydraulics and Fluid Mechanics in ME
A model of a reservior is drained in 4 mts by opening the sluice gate. The model scale is 1: 225. How long should it take to empty the prototype ?

4 x V225 minutes
4 minutes
4 x (225)3/2 minutes
4 (225)1/3 minutes

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Hydraulics and Fluid Mechanics in ME
Overall efficiency of a centrifugal pump is the ratio of

Energy supplied to the pump to the energy available at the impeller
Actual work-done by the pump to the energy supplied to the pump by the prime mover
Energy available at the impeller to the energy supplied to the pump by the prime mover
Manometric head to the energy supplied by the impeller per kN of water

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