Question Bank • QB_APE_PROC_004 NAT • 2 Marks

Section 6: Agricultural Process Engineering

Processing of Agriculture Produce

Subtopic: Processing of seeds, spices, fruits and vegetables

Question Statement:

In a pulse (dal) milling plant, $800\text{ kg}$ of cleaned pigeon pea (arhar) grains are conditioned and fed to an emery roller dehusker. The output yields $544\text{ kg}$ of dehusked split dal, $96\text{ kg}$ of dehusked whole grain (gota), $32\text{ kg}$ of broken dal, and $128\text{ kg}$ of husk and brokens powder. The overall dehusking percentage (fraction of grain completely free of husk relative to initial feed mass) is ________ % (round off to one decimal place).

Answer Key:

84.0

Step-by-Step Solution & Explanation

Multi-Approach Solution: **Method 1: Dehusked Fraction Summation** Total dehusked product = Dehusked split dal ($544\text{ kg}$) + Dehusked whole dal ($96\text{ kg}$) + Dehusked broken dal ($32\text{ kg}$) = $672\text{ kg}$. $\text{Dehusking } \% = \frac{672\text{ kg}}{800\text{ kg}} \times 100\% = 84.0\%$ **Method 2: Waste Balance** $\text{Dehusking } \% = \frac{800 - 128}{800} \times 100\% = \frac{672}{800} \times 100\% = 84.0\%$
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