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

PhysicsW.E.P.PowerEasy2 minPYQ_2020

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

Options:

Answer:

Solution:

Power consumed by the motor = $5 kW$

$= 5 \times 10^{3} W$

$= 5000 W$

Power used in lifting the water

$= \frac{m g h}{t}$

$= 75 \times 9.8 \times 4.7$

$= 3454 .5 kW$

Efficiency $= \frac{P o w e r u s e d}{P o w e r c o n s u m e d} \times 100 %$

$= \frac{3454.5}{5000} \times 100 = 69 %$

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

⏱ 2mℹ️ Source: PYQ_2020

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