Question

An electric driven pump lifts
2000 litres of water to a height
of 20 m in one minute. Calculate
the power input to the motor, if
the combined n of the motor and
pump is 75%.​

Answer 1

Answer:

Explanation:

Power of pump=2kW=2000W

Time(t)=60s

Height(h)=10 m

g=10ms

−2

We know,

Power=work done per unit time

Work done=mgh

=m×10×10

=100m

Power=

t

100m

​

2000=

60s

100m

​

m=1200 kg

Hence,pump can raise 1200 kg water per minute up to 10 m height.