Allied & ICAR Exam Bank • ALLIED_0119 NAT • 1 Mark

Section 2: Farm Machinery

Machine Design

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

Question Statement:

A V-belt drive has groove angle $2\beta = 40^\circ$ (half-angle $\beta = 20^\circ$) and coefficient of friction $\mu = 0.25$. The virtual coefficient of friction $\mu' = \mu / \sin\beta$ is (rounded off to two decimal places):

Answer Key:

0.73

Step-by-Step Solution & Explanation

$\mu' = \frac{\mu}{\sin 20^\circ} = \frac{0.25}{0.3420} \approx 0.731$.
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