Question

Find the region if the final and the initial moisture content are 40% and 30% (Dry basis) and the critical moisture content is 45%.

(a) Constant rate

(b) Falling rate

(c) Internal movement

(d) None of the mentioned

I had been asked this question in final exam.

My question is based upon Time period Calculation in Batch Drying in chapter Drying of Mass Transfer

Answer 1

Right choice is (b) Falling rate

For explanation I would say: Here both initial and final moisture content are less than critical moisture content so the rate is falling rate period.