Question

a water reservoir tank of capacity 25o cubic meter is situated at a height of 20m from the water level.what will be the power of an electric motor to be used to fill the tank in 3 hrs? Efficiency of motor is 70%.

Answer 1

Answer:

Explanation:

Given,

Volume=250m³

Height=20m

Efficency=70%

Now,

Output energy reqiured for motor

=workdone by PE

=mgh

=density ×volume×gh

=1000×250×10×20

=5 × 10*7

So,

E=output/input ×100%

Input=71428571.43

Power= W/t

=71428571.43/(3600×3)

=6613.76watt