Question

A water tank of 5000 litres capacity is at 20 m above the ground. It is to be filled within 15
minutes from a tank at ground level by a pump. Calculate power of the pump required in
H.P., if efficiency of pump is 75%.

Answer 1

Explanation:

Answer

Correct option is

C

15 minutes

Power = P = 1 HP = 746 W

Depth = d = 20 m

H = 10 + 20 = 30 m

Volume = V = 2238 l

Mass of water = m = m=density×volume=1kg/m

3

×2238m

3

=2238kg

t=

P

potentialEnergy

=

P

mgh

=

746W

2238kg×9.8m/s

2

×30m

=900s=

60

900

min=15min