First slide

Power

Question

A motor pump set of efficiency 80%, lifts 800 litres of water in 19.6 seconds over a head of 20 m. Its input power is

Moderate

A

64 KW
B

40 KW
C

10 KW
D

196 KW

Solution

$η = \frac{P_{O U T}}{P_{I N}} P_{I N} = \frac{100 X 800 X 9.8 X 20}{80 X 19.6} = 10 K W$

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