# NFo= (αtT)/s^2. Here ‘s’ stands for half slab thickness. Based on this data, ‘s’ for a chapatti/ dosa will be _____

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NFo= (αtT)/s^2. Here ‘s’ stands for half slab thickness. Based on this data, ‘s’ for a chapatti/ dosa will be _____

(a) Half slab thickness

(b) Full slab thickness

(c) One and a half slab thickness

(d) Double slab thickness

This question was addressed to me by my college director while I was bunking the class.

This is a very interesting question from Unit Operations in division Heat Transfer by Conduction, Convection and Radiation of Food Engineering

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Right answer is (b) Full slab thickness

Easiest explanation: ‘s’ for a chapatti/ dosa will be Full slab thickness. This is because ‘s’ equals half slab thickness only when heating takes place from both sides. But, for a chapatti/ dosa, heating takes place only from one end hence‘s’ becomes ‘2s’.

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