An engineer claims to have made an engine delivering $10 kW$ power with fuel consumption of $1\,g\,{s^{ - 1}}$. The calorific value of fuel is $2k cal/g$. His claim
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(a) Power $ = 10\,KW = 10000\,J/s = \frac{{10000}}{{4.2}} = 2.38\,k\,cal/gm$
But the calorific value of fuel is only $2 k cal/gm$. Hence claim is invalid.
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