Neco Model Questions Vol1 2021 Agricultural Science Question 10
Practice objective / multiple choice question 10 from the 2021 Neco Model Questions Vol1 Agricultural Science examination.
A batch of 500 kg of cassava roots is harvested with a moisture content of 65 % (wet basis). To store safely the moisture must be reduced to 20 % (wet basis). The drying kiln follows the moisture‑removal law \(\frac{dM}{dt} = -k\,(M - M_{eq})\) where \(M\) is moisture (% wet basis), \(M_{eq}=15\%\) and \(k = 0.03\,\text{h}^{-1}\).\n(a) How many hours are required to reach 20 % moisture?\n(b) After drying, the cassava is packed in 25 kg bags. The respiration rate at 20 % moisture causes a weight loss of 0.1 % per day. Assuming this loss is continuous, calculate the total weight loss (in kg) after 30 days of storage and the net weight of cassava remaining.
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This is Neco Model Questions Vol1 2021 Agricultural Science Question 10. It is one of the objective questions from the 2021 Neco Model Questions Vol1 Agricultural Science examination.
Difficulty level: Hard .
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