Gce Model Questions Vol1 2023 Agricultural Science Question 13
Practice objective / multiple choice question 13 from the 2023 Gce Model Questions Vol1 Agricultural Science examination.
A batch of 10 000 kg of maize kernels is harvested at an initial moisture content of 20 % (wet basis). The desired final moisture content is 12 % (wet basis). The drying process follows the first‑order model \( \frac{dM}{dt}=k\,(M-M_e) \) where \(M\) is the moisture content expressed as kilograms of water per kilogram of dry matter, \(M_e\) is the equilibrium moisture content, and \(k = 1.0\times10^{-3}\ \text{s}^{-1}\). At the drying air conditions (30 °C, 30 % relative humidity) the equilibrium moisture content is \(M_e = 0.05\ \text{kg water kg}^{-1}\text{dry matter}\). Determine the time required, in minutes, to reduce the moisture content from the initial level to the target level.
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This is Gce Model Questions Vol1 2023 Agricultural Science Question 13. It is one of the objective questions from the 2023 Gce Model Questions Vol1 Agricultural Science examination.
Difficulty level: Hard .
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