12.
A steam pipe is to be insulated by two insulating materials put over each other. For best results

13.
Total heat is the heat required to

14.
Sensible heat is the heat required to

15.
When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by

16.
When heat is transferred from hot body to cold body, in a straight line, without affecting the intervening medium, it is referred as heat transfer by

17.
The concept of overall coefficient of heat transfer is used in case of heat transfer by

18.
When heat is transferred by molecular collision, it is referred to as heat transfer by

19.
Stefan Boltzmann law is applicable for heat transfer by

20.
A non-dimensional number generally associated with natural convection heat transfer is

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