Heat and Mass Transfer
The amount of heat flow through a body by conduction is

Dependent upon the material of the body
Directly proportional to the surface area of the body
All of these
Directly proportional to the temperature difference on the two faces of the body

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Heat and Mass Transfer
Kirchhoff's law states that

The total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature
None of these
The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body
The wave length corresponding to the maximum energy is proportional to the absolute temperature

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Heat and Mass Transfer
A steam pipe is to be insulated by two insulating materials put over each other. For best results

Inferior insulation should be put over pipe and better one over it
Whether to put inferior OIL over pipe or the better one would depend on steam temperature
Both may be put in any order
Better insulation should be put over pipe and better one over it

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