Question

Statement 1: Sterilization value of steam depends largely on the transfer of heat of vaporization to the object upon which it condenses.

Statement 2: Canned food items which heat up by convection heat up faster than those by conduction.

(a) True, False

(b) True, True

(c) False, False

(d) False, True

I got this question at a job interview.

Asked question is from Principles of Food Preservation by Canning-3 in chapter Principles of Food Preservation by Canning and Drying and Principles of Food Concentrates of Food Engineering

Answer 1

Right option is (b) True, True

Easy explanation: Sterilization value of steam depends largely on the transfer of heat of vaporization to the object upon which it condenses. Canned food items which heat up by convection heat up faster than those by conduction. This is because heat transfer by convection (actual movement of molecules) is faster than heat transfer by conduction (simple molecular vibration).