An installation consisting of an electric motor driving a water pump left 75 L of water per second to a height of 4 .7 m . If the motor consumes a power of 5 kW , then the efficiency of the installation is

Question

An installation consisting of an electric motor driving a water pump left 75 L of water per second to a height of 4 .7 m . If the motor consumes a power of 5 kW , then the efficiency of the installation is, 39 %, 69 %, 93 %, 96 %

MARKS App · Accepted Answer

Power consumed by the motor = 5 kW = 5 × 10 3 W = 5000 W Power used in lifting the water = m g h t = 75 × 9.8 × 4.7 = 3454 .5 kW Efficiency = P o w e r u s e d P o w e r c o n s u m e d × 100 % = 3454.5 5000 × 100 = 69 %

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