Question

Which of the following sentences is true?

(a) Direct heating has higher heat transfer rates than indirect heating

(b) Indirect heating has higher heat transfer rates than direct heating

(c) Both of them have the same heat transfer rates

(d) Cannot be determined

This question was posed to me in an interview for job.

Query is from Unit Operations in section Heat Transfer Equipment, Microwave Heating, Evaporation, Diffusion and Mass Transfer and Dehydration of Food Engineering

Answer 1

Correct answer is (a) Direct heating has higher heat transfer rates than indirect heating

For explanation: Direct heating has higher heat transfer rates than indirect heating.