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Q.

A motor pump is delivering water at certain rate. In order to increase the rate of delivery by 200 %. The power of the motor is to be increased by

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a

700 %

b

2700 %

c

2600 %

d

800 %

answer is D.

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Detailed Solution

$P \propto n^{3} \frac{P_{2}}{P_{1}} = {(\frac{n_{2}}{n_{1}})}^{3} = {(\frac{2 n_{1}}{n_{1}})}^{3} = 8 P o w e r i n c r e a s e s b y 700 %$

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