750 W Motor Drivers Pump Which Lifts 300 Litres Of Water Per Minute To Height Of 6 Meters

A 750 W motor drivers a pump which lifts 300 litres of water per minute to a height of 6 meters. The efficiency of … (B) 40% (C)…

Answers:

Correct option (B) 40% 

 Explanation:

Mgh = 300 × 10 × 6

Pi = mgh/t =  (300 × 10 × 6)/60 = 300W

P0 = 750 W

Ƞ = (300/750) × 100 = 40%