Discussion
Which statement about the falling rate period is FALSE?
Answer: C
Correct answer: Raising the air velocity greatly increases the drying rate
This is the false statement. In the falling rate period the limiting resistance lies inside the solid, so raising the air velocity - which acts only on the external boundary layer - achieves very little.
The other three are true. Most of the drying time is usually spent in this period, because the rate keeps falling as the remaining moisture is more firmly held and has further to travel. The product temperature rises above the wet bulb value, since evaporative cooling no longer holds it there. And internal moisture movement is what controls the rate throughout.
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