Discussion
Which of the following is not a mode of conductive drying of food materials?
Answer: B
The one that is not conductive drying is Air drying.
In conductive (contact) drying, heat reaches the food through a hot solid surface in contact with it. Drum drying, where a thin film dries on a steam-heated drum, and vacuum drying on heated shelves or plates are standard examples, and drying in superheated steam is grouped with them in the classification the paper follows.
In air drying, heated air flows over or through the food and supplies the heat while carrying away the vapour. That is convective drying, not conductive drying, so it is the odd one out.
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