Question

A pump is required to lift 1000 kg of water per minute from a well of depth 10 m and eject it with a speed of 10 m/s. The horse power of the engine needed is (assume $g=10m/s^2$)

• A. $3.33$
• B. $4.33$
• C. $5.35$
• D. $2.35$

Answer 1

Answer: (A)

$3.33$

Power = $\frac{\text{Work done}}{\text{time}}$

$P=\frac{(mgh+\frac{1}{2}m{v}^2)}{\text{time}}$

$=\frac{1000\times 10\times 10+\frac{1}{2}\times 1000\times {10}^2}{60}$

$=2500$ watt

$=\frac{2500}{746}=3.35$ HP