Waec Model Questions Vol1 2020 Agricultural Science Question 36
Practice objective / multiple choice question 36 from the 2020 Waec Model Questions Vol1 Agricultural Science examination.
A batch of cassava chips is dried in a hot‑air dryer at 60°C. The initial moisture content (wet basis) is 45 %, the equilibrium moisture content is 12 %, and the target moisture content is 20 %. The drying constant k follows the Arrhenius relation k = A·exp(-Ea/(R·T)), where A = 0.5 min⁻¹, Ea = 5000 J·mol⁻¹, R = 8.314 J·mol⁻¹·K⁻¹ and T is the absolute temperature. Assuming the moisture ratio MR = (M‑Me)/(Mo‑Me) = e^{‑k t}, calculate the drying time required (in minutes) to reach the target moisture.
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About This Question
This is Waec Model Questions Vol1 2020 Agricultural Science Question 36. It is one of the objective questions from the 2020 Waec Model Questions Vol1 Agricultural Science examination.
Difficulty level: Hard .
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