Mechanical Technology 91 Question Paper Exclusive: __top__

You need to explain the "why" behind material selection. Be prepared to discuss: Carbon content in steel. Annealing, hardening, and tempering processes.

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A furnace wall is made of 200 mm of fireclay brick (k=1.2 W/mK) and 100 mm of insulating brick (k=0.2 W/mK). The inner surface temperature is 800°C and the outer is 80°C. Calculate the heat loss per square meter. Sketch the temperature gradient curve. You need to explain the "why" behind material selection