Discussion
A boiler burns 500 kg/h of oil of net calorific value 42 MJ/kg. The heat input is
Answer: A
Five hundred kilograms an hour is 0.139 kilograms a second, and multiplying by 42 megajoules a kilogram gives 5.83 megawatts. Converting the hourly figure to a per-second one before multiplying is the step most often fumbled.
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