18:(a) What are the approximate chemical composition of gasoline, LPG, diesel, natural gas & methanol? How presence of moisture in air does affects the outcome of a combustion process. (b) A composite wall is formed of a 2.5 cm copper plate (k = 355 W/m.K), a 3.2 mm layer of asbestos (k = 0.110 W/m.K) and a 5 cm layer of fibre plate (k = 0.049 W/m.K). The wall is subjected to an overall temperature difference of 560°C (560°C on the Cu plate side and O°C on the fiber plate side). Estimate the heat flux through this composite ~all and the interface temperature between asbestos and fibre plate.

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