Waec Model Questions Vol1 2020 Agricultural Science Question 3
Practice objective / multiple choice question 3 from the 2020 Waec Model Questions Vol1 Agricultural Science examination.
A farmer wants to dry 500 kg of fresh cassava chips that have an initial moisture content of 45 % (wet basis) to a final moisture content of 12 % (wet basis). The chips are dried in a solar dryer in which air is heated from 25 °C to 45 °C. Air flows through the dryer at 0.5 m³ s⁻¹. The density of air at 45 °C is 1.1 kg m⁻³ and its specific heat is 1.005 kJ kg⁻¹ K⁻¹. The latent heat of vaporisation of water at 45 °C is 2 400 kJ kg⁻¹. Assuming all the sensible heat supplied to the air is used solely for water evaporation, estimate the minimum drying time in hours (round to one decimal place).
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About This Question
This is Waec Model Questions Vol1 2020 Agricultural Science Question 3. It is one of the objective questions from the 2020 Waec Model Questions Vol1 Agricultural Science examination.
Difficulty level: Hard .
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