Answer: Option (a) is the correct answer.
Explanation:
Heat transfer in terms of convection means that heat is transferring due to the motion of mass of an object or substance.
As convection is related to fluids, that is, only liquids and gases.
Now, relation between heat transfer and [tex]R_{total}[/tex] is as follows.
q = [tex]\frac{(T_{1} - T_{2}}{R_{total}}[/tex] ........ (1)
Also, q = [tex]U \times A \times (T_{1} - T_{2})[/tex] ......... (2)
where, U = overall coefficient
A = surface area of substance
Hence, equating both equations (1) and (2) we get the following.
U = [tex]\frac{1}{R_{total} \times A}[/tex]
So, it means that overall heat transfer coefficient is the reciprocate of [tex]R_{total}[/tex] and also it is related to thermal resistance.
Thus, we can conclude that out of the given options, the statement it cannot be applied to heat transfer involving convection, is wrong.
