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Question
A solid is being dried in the linear drying rate regime from moisture content Xo to XF. The drying rate is zero at X = 0 and the critical moisture content is the same as the initial moisture Xo. The drying time for M = (Ls/ARc) is (where, L = total mass of dry solid, A = total surface area for drying Rc = Constant maximum drying rate per unit area X = moisture content (in mass of water/mass of dry solids)
Options:
A .  M(Xo - XF)
B .  M(Xo/XF)
C .  M ln(Xo/XF)
D .  MXo ln(Xo/XF)
Answer: Option D

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