Work Energy And Power Question 195
Question: 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 [JIPMER 2002]
Options:
A) 16 times
B) 4 times
C) 8 times
D) 2 times
Show Answer
Answer:
Correct Answer: C
Solution:
Power of a pump $ =\frac{1}{2}\rho Av^{3} $
To get twice amount of water from same pipe v has to be made twice.
So power is to be made 8 times.
