a) Mention three (3) industrial applications of thermal insulators b) List three (3) properties necessary for the selection of fin materials c) How does the use of fins enhance the rate of heat transfer? [3] d) Name the two (2) applications of fins e) A surface at 200C exposed to the surrounding at 110C convects and radiates heat to the [3] respectively. If the heat is conducted through a solid of conductivity 10W/mC. what is the temperature gradient at the surface in the solid? Take =5.670108W/m2K4