Allied & ICAR Exam Bank • ALLIED_1259 NAT • 2 Marks

Section 6: Agricultural Process Engineering

Size Reduction and Milling

Subtopic: Rubber Roll Dehusker

Question Statement:

In a modern rubber roll paddy dehusker, two rubber rolls of diameter 250 mm rotate in opposite directions at differential speeds. The fast roll rotates at 1200 rpm and the slow roll at 900 rpm. The speed ratio of the rolls (fast to slow) is:

Answer Key:

1.33

Step-by-Step Solution & Explanation

Speed ratio $= \frac{1200}{900} = \frac{4}{3} \approx 1.333$. (A peripheral speed differential of about 25-30% generates optimum shear force to strip paddy hulls with minimal broken rice).
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