Question

12 HP motor has been engaged to take out water
from 75 metre deep mine. How much water in litre
has been taken out by motor in one hour.​

Answer 1

15 minCorrect 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

Answer 2

900 is the answer

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