Question

Which is the slowest mode of heat transfer?

(a) Conduction

(b) Convection

(c) Radiation

(d) Both radiation and convection

I had been asked this question during an interview.

Origin of the question is Heat Conduction topic in portion Heat Transfer Theory of Food Processing Unit Operations

Answer 1

Correct answer is (a) Conduction

The explanation: Conduction is the slowest mode of heat transfer because it takes place from particle to particle. The fastest mode of heat transfer is radiation as it travels at the speed of light.