Waec Model Questions Vol1 2019 Agricultural Science Question 34
Practice objective / multiple choice question 34 from the 2019 Waec Model Questions Vol1 Agricultural Science examination.
A batch of 500 kg of cassava roots has an initial moisture content of 60 % (wet basis). The desired final moisture content is 15 % (wet basis). The drying follows the exponential model M(t) = M_eq + (M₀ - M_eq) e^{‑kt}, where M(t) is the moisture content at time t (hours), M_eq = 10 % (wet basis) is the equilibrium moisture, and k = 0.25 h⁻¹. (a) Determine the drying time required to reach the target moisture content. (b) Calculate the total amount of water removed (in kg) and the energy needed to evaporate that water, given that 2.45 MJ of energy is required to evaporate 1 kg of water.
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This is Waec Model Questions Vol1 2019 Agricultural Science Question 34. It is one of the objective questions from the 2019 Waec Model Questions Vol1 Agricultural Science examination.
Difficulty level: Hard .
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