Heat & Mass Transfer MCQ Question with Answer

Question No : 36
The emissivity for a black body is

Question No : 37
The critical thickness of insulation for a sphere is

Question No : 38
The unit of Stefan Boltzmann constant is

Question No : 39
Which of the following statement is correct?

Question No : 40
The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles due to difference of density caused by temperature of the particle is known as

Question No : 41
Log mean temperature difference in case of counter flow compared to parallel flow will be

Question No : 42
In regenerator type heat exchanger, heat transfer takes place by