Allied & ICAR Exam Bank • ALLIED_1289 NAT • 2 Marks

Section 6: Agricultural Process Engineering

Psychrometry and Grain Drying

Subtopic: Drying Rate

Question Statement:

A batch dryer evaporates 50 kg of water from grain in 2.5 hours. If the exposed drying bed surface area is $4.0\text{ m}^2$, the average drying rate in kg of water/(m$^2\cdot$h) is:

Answer Key:

5.0

Step-by-Step Solution & Explanation

Drying rate $N = \frac{\Delta m}{A \times \Delta t} = \frac{50\text{ kg}}{4.0\text{ m}^2 \times 2.5\text{ h}} = \frac{50}{10.0} = 5.0\text{ kg/(m}^2\cdot\text{h)}$.
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