A motor cycle engine delivers a power of $$l0$$ kW, by consuming petrol at the rate of $$2.4$$ $$kg/hour$$. If the calorific value of petrol is $$35.5$$ $$MJ/kg$$, the rate of heat rejection by the exhaust is

Question

Infinity Learn · Accepted Answer

Heat received (or$$ produced by the burning of $$petrol) in one hour will be              $$=$$ (2.4$$ $$kg/hour)(3.5$$ $$MJ/kg)             $$=$$ $$85.2$$× $$106$$ $$J/hour$$∴ The rate at which heat is received    $$=$$ $$85.2$$ ×$$106J(3600s)$$ $$=$$ $$2.37$$ ×$$104$$ $$J/s$$ $$=$$ $$23.7$$ kWEvidentaly, the rate of heat rejection $$=$$ rate at which heat is produced $$-$$ rate at which work is obtained $$=$$ $$23.7$$ kW $$-$$ $$10kW$$ $$-$$ $$13.7$$ kW

A motor cycle engine delivers a power of l0 kW, by consuming petrol at the rate of 2.4 kg/hour. If the calorific value of petrol is 35.5 MJ/kg, the rate of heat rejection by the exhaust is

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