Heat and Mass Transfer
A steam pipe is to be lined with two layers of insulating materials of different thermal conductivities. For the minimum heat transfer,

The better insulation must be put outside
One should take into account the steam temperature before deciding as to which insulation is put where
One could place either insulation on either side
The better insulation must be put inside

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Heat and Mass Transfer
According to Prevost theory of heat exchange

All bodies above absolute zero emit radiation
Heat transfer by radiation requires no medium
Heat transfer in most of the cases takes place by combination of conduction, convection and radiation
It is impossible to transfer heat from low temperature source to t high temperature source

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