Question

Statement 1: Nucleate Boiling is when a layer of film is formed in the beginning.

Statement 2: Boiling starts with the bottom layer which heats up, becomes light and goes up. That way everything becomes hot and there is not temperature difference and hence no heat transfer.

(a) True, False

(b) True, True

(c) False, False

(d) False, True

This question was addressed to me in an interview.

My question is based upon Unit Operations topic in section Heat Transfer by Conduction, Convection and Radiation of Food Engineering

Answer 1

Right choice is (d) False, True

The best explanation: Film Boiling is when a layer of film is formed in the beginning. Boiling starts with the bottom layer which heats up, becomes light and goes up. That way everything becomes hot and there is not temperature difference and hence no heat transfer.