First slide
Power
Question

An Electric pump is used to fill an overhead tank of capacity 9m3  kept at a height 10 m above ground.  If the pump takes 5 minutes to fill the tank by consuming 10 kilo watt power,  efficiency of the pump should be (take  g  =   10m/s2)   

Moderate
Solution

Powerout   =    mght Powerout  =    9×103×10×10300 Powerout   =   3KiloWatt; given Powerin=10 KiloWatt percentage efficiency =        PoweroutPowerinx100   =    310×100  =   30%

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