First slide

Power

Question

An electric pump is used to fill an overhead tank of capacity 9 m³ kept at a height 10 m above ground. If the pump takes 5 minutes to fill the tank by consuming 10 kW power, efficiency of the pump should be : (take g = l0 m/s²)

Easy

A

60%
B

40%
C

20%
D

30%

Solution

$Efficiency = \frac{Output}{Input} \times 100 = \frac{\frac{(9 \times 1000) (10) (10)}{5 \times 60}}{10 \times 10^{3}} \times 100 = 30 %$

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