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Question

A 12 HP motor has to be operated 8 hours/day. How much will it cost at the rate of 50 paisa/kWh in 10 days


A

Rs. 350/-

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B

Rs. 358/-

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C

Rs. 375/-

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D

Rs. 397/-

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Solution

The correct option is B

Rs. 358/-


If a motor of 12 HP works for 10 days at the rate of 8 hr/day then energy

consumption = power × time

=12×746Jsec×(10×8×60×60)sec

=12×746×80×60×60J=2.5×109J

Rate of energy = 50paisakWh

i.e 3.6×106J energy cost 0.5 Rs

So 2.5×109J energy cost = 2.5×1092×3.6×106 = 358 Rs


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