What is the average power output of an electric motor driving a pump for lifting 200 kg of water at a height of 100 m in 1 minute? Efficiency of pump is 75%
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a
3.25 kW
b
7.84 kW
c
6.45 kW
d
4.44 kW
answer is D.
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Detailed Solution
Power output of the pump =200×100×1060 W∴ Power input to the pump =200×100×1060×0.75 watt =4.44 kW∴ Power output of the motor = 4.44 kW.