Allied & ICAR Exam Bank • ALLIED_0827 NAT • 2 Marks

Section 2: Farm Machinery

Machine Design

Subtopic: Design and selection of machine elements – gears, pulleys, chains and sprockets and belts

Question Statement:

A rotary mower disc of diameter $D = 0.5\text{ m}$ (radius $r = 0.25\text{ m}$) spins at $N = 3000\text{ rpm}$. The knife tip speed $v = \frac{2 \pi N r}{60} = \frac{2 \times 3.1416 \times 3000 \times 0.25}{60}$ in m/s is (rounded off to one decimal place):

Answer Key:

78.5

Step-by-Step Solution & Explanation

$v = \frac{4712.39 \times 0.25}{60} = 78.54\text{ m/s} \approx 78.5\text{ m/s}$.
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