+1 vote
in Mass Transfer by (37.1k points)
Falling rate period of a batch process starts at

(a) Saturated drying surface

(b) Unsaturated drying surface

(c) Both unsaturated and saturated region

(d) None of the mentioned

I had been asked this question by my school principal while I was bunking the class.

The origin of the question is Time period Calculation in Batch Drying topic in chapter Drying of Mass Transfer

1 Answer

0 votes
by (39.8k points)
The correct answer is (b) Unsaturated drying surface

Easy explanation: The bound moistures gets evaporated only at unsaturated surface which is a falling rate period.

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