Work Energy And Power Question 292

Question: An electric pump is used to fill an overhead tank of capacity 9m3 kept at a height of 10m above the ground. If the pump takes 5 minutes to fill the tank by consuming 10 kW power the efficiency of the pump should be (g=10ms2)

Options:

A) 60%

B) 40%

C) 20%

D) 30%

Show Answer

Answer:

Correct Answer: D

Solution:

[d] Pout=mght=9000×10×105×60=3600W

Pin=10×103w.

η=PoutPin×100=300010×103×100=30



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