Heat & Mass Transfer MCQ Question with Answer

Question No : 22
Heat transfer takes place as per

Question No : 23
Moisture would find its way into insulation by vapour pressure unless it is prevented by

Question No : 24
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. This statement is known as

Question No : 25
Heat transfer in liquid and gases takes place by

Question No : 26
Unit of thermal diffusivity is

Question No : 27
The ratio of surface convection resistance to the internal conduction resistance is known as

Question No : 28
40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is