Neco 2025 Agricultural Science Question 11
Practice objective / multiple choice question 11 from the 2025 Neco Agricultural Science examination.
A batch of 500 kg of cassava roots initially contains 30% moisture (wet basis). They are dried in two phases. Phase 1: hot air at 70°C for 3 hours reduces moisture content by 40 % of the initial moisture amount. Phase 2: air at 45°C continues drying until the final moisture content reaches 12% (wet basis). During phase 2 the drying rate follows \( \frac{dM}{dt}= -k\,(M-E) \) where \(k = 0.08\ \text{h}^{-1}\) and the equilibrium moisture \(E = 5\%\) (wet basis). Determine the duration of phase 2 (in hours) required to achieve the target moisture.
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About This Question
This is Neco 2025 Agricultural Science Question 11. It is one of the objective questions from the 2025 Neco Agricultural Science examination.
Difficulty level: Hard .
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