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Physics - W.E.P. Question with Solution | TestHub

PhysicsW.E.P.PowerEasy2 minPYQ_2014

PhysicsEasysingle choice

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

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Answer:

Solution:

$Power consumed by motor = 5 kW = 5 \times 1 0^{3} W = 5000 W Power used in lifting water = \frac{mgh}{t} = 7.5 \times 9.8 \times 4.7 = 3454.5 kW Efficiency = \frac{Power used}{Power consumed} \times 100% = \frac{3454.5}{5000} \times 100 = 69%$

Stream:VITEEESubject:PhysicsTopic:W.E.P.Subtopic:Power

⏱ 2mℹ️ Source: PYQ_2014

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