Q.

A pump motor is used to deliver water at a certain rate from a given pipe. To obtain twice as much water from the same pipe in the same time, power of the motor has to be increased to

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a

16 times

b

4 times

c

8 times

d

2 times

answer is C.

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Detailed Solution

Power of a pump =12ρdv3To get twice amount of water from same pipe v has to be made twice. So power is to be made 8 times.
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A pump motor is used to deliver water at a certain rate from a given pipe. To obtain twice as much water from the same pipe in the same time, power of the motor has to be increased to