KVPY SA Exam 2011 Question Paper

Question : 27 of 80

Marks: +1, -0

A 750 W motor drives a pump which lifts 300 litres of water per minute to a height of 6 meters. The efficiency of the motor is nearly (take acceleration due to gravity to be 10 m/

\s^2

)

Validate

Solution:

mgh = 300 × 10 × 6

\P_i={\mgh}/t

={300×10×6}/60=300\W

\P_0 = 750 \W

\η = 300/750×100=40%

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