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A water pump driven by petrol raises wat...

A water pump driven by petrol raises water at a rate of 0.5 m' min from a depth of 30 m. If the pump is 70% efficient, what power is developed by the engine?

A

1750 W

B

2450 W

C

3500W

D

7000W

Text Solution

Verified by Experts

The correct Answer is:
c
Here mass/min. `(dm)/(dt)=500 kg min^(-1)`
=`(500)/(60)kg s^(-1)`
Also `(70)/(100)xxP=(mgh)/(t)`
or `P=(100)/(70).(mgh)/(t)`
=`(100)/(70)xx(500)/(6)xx9.8xx30`
=3500 W.
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