Heat Transfer
Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer co-efficient is 3k/l. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade?

81.25
43.75
48.25
35.5

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Heat Transfer
Baffle spacing

Should be less than the inside diameter of the shell
None of these
Is not the same as baffle pitch
Should be less than one fifth the diameter of the shell

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