1. Cabinet/ Tray driers are direct driers.

2. If time taken for moisture removal is obtained from formula
Time = Ss(Xc – Xe)/ Nc * A ln ((X1-Xe)/(X2-Xe)) n falling curve will be curves symmetrically
Where, Ss= Wet solid weight
Xc,Xe- constant & equilibrium moisture content
X1,X2 – initial and final moisture content

3. Find period if initial and final moisture content are 60% and 40%. Also critical moisture content is 30%.

4. Find gas phase mass transfer co-efficient for a unbound moisture to remove if flux is 5 kg/sq.m sec and difference in humidity of liquid and main stream is 0.5 units.

5. Find period if initial and final moisture content are 50% and 20%. Also critical moisture content is 30%.

6. For a batch drying, wet surface should be more compare to dry surface.

7. Find final moisture content for batch process if initial moisture content is 75% (dry basis) and constant moisture content is 40%. (Includes constant and falling rate period)

8. Find Constant rate representation

9. Find representation AB in batch drying curve.

10. Calculate flux (kg/sq.m sec) if
Mass of dry solid = 8 kg; Wet surface area = 4 sq.m; Change in moisture content with time is 0.4 /sec;