Gce Model Questions Vol1 2022 Agricultural Science Question 38
Practice objective / multiple choice question 38 from the 2022 Gce Model Questions Vol1 Agricultural Science examination.
A batch dryer is used to dry 500 kg of mango slices. The initial moisture content is 70 % (wet basis) and the desired final moisture content is 10 % (wet basis). Hot air at 60 °C flows through the dryer at a mass flow rate of 1.5 kg s⁻¹; its specific heat is 1.0 kJ kg⁻¹ K⁻¹. The latent heat of vaporisation of water at 60 °C is 2350 kJ kg⁻¹. The entering air has a relative humidity of 30 % and leaves the dryer at 70 % relative humidity. Assume the specific heat of mango (dry basis) is 3.5 kJ kg⁻¹ K⁻¹ and that the temperature of the mango remains essentially constant at 30 °C during drying. Calculate the total drying time required (in minutes).
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About This Question
This is Gce Model Questions Vol1 2022 Agricultural Science Question 38. It is one of the objective questions from the 2022 Gce Model Questions Vol1 Agricultural Science examination.
Difficulty level: Hard .
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