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

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64 KW

40 KW

10 KW

196 KW

answer is C.

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Detailed Solution

η =POUTPIN PIN= 100 X800X 9.8X2080 X19.6 =10 KW

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