Allied & ICAR Exam Bank • ALLIED_1073 NAT • 2 Marks

Section 2: Farm Machinery

Machine Design

Subtopic: Helical Springs

Question Statement:

A helical compression spring used in a planter furrow opener has mean coil diameter $D = 40\text{ mm}$ and wire diameter $d = 5\text{ mm}$. The spring index $C = D/d$ is:

Answer Key:

8.0

Step-by-Step Solution & Explanation

Spring index $C = \frac{D}{d} = \frac{40\text{ mm}}{5\text{ mm}} = 8.0$.
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