Gce Model Questions Vol1 2018 Agricultural Science Question 8
Practice objective / multiple choice question 8 from the 2018 Gce Model Questions Vol1 Agricultural Science examination.
A farmer harvests \(2\) tonnes of maize with an initial moisture content of \(25\)% (wet basis). The desired final moisture is \(14.5\)% (wet basis). The drying follows the exponential model \(M(t)=M_f+(M_0-M_f)e^{-kt}\) where \(M(t)\) is the moisture fraction at time \(t\) (hours), \(M_0=0.25\), \(M_f=0.145\) and \(k=0.05\) h⁻¹.\ (a) Determine the drying time required to reach the target moisture (to one decimal place of hour).\ (b) A conventional hot‑air dryer would use \(1.5\) MJ of energy per kilogram of water removed. Assuming the solar dryer uses negligible energy, calculate the energy saved (in megajoules, to the nearest whole number).
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This is Gce Model Questions Vol1 2018 Agricultural Science Question 8. It is one of the objective questions from the 2018 Gce Model Questions Vol1 Agricultural Science examination.
Difficulty level: Hard .
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