Allied & ICAR Exam Bank • ALLIED_1265 NAT • 2 Marks

Section 6: Agricultural Process Engineering

Mechanical Separation and Cleaning

Subtopic: Screen Effectiveness

Question Statement:

A vibrating screen separates grain mixture into oversize and undersize streams. Feed rate is 100 kg/h containing 80% whole grain ($x_F = 0.80$). The overflow product is 75 kg/h containing 96% whole grain ($x_D = 0.96$). The recovery of whole grain in the overflow stream (in %) is:

Answer Key:

90.0

Step-by-Step Solution & Explanation

Whole grain in feed $= 100 \times 0.80 = 80\text{ kg/h}$. Whole grain recovered in overflow $= 75 \times 0.96 = 72\text{ kg/h}$. Recovery $= \frac{72}{80} \times 100 = 90.0\%$.
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