Question

A motor pump-set of efficiently 80% lifts 6000 litres of water per minute from a well 20 meters deep. If $g=10m{s}^{-2}$, its input power is

• A. 20 kW
• B. 25 kW
• C. 16 kW
• D. 250 kW

Answer 1

The correct option is B 25 kW

$80\%P=\frac{mgh}{t}P=\frac{mgh}{t}\times \frac{1}{0.8}=\frac{6000\times 10\times 20}{60\times 0.8}=25kW$