Allied & ICAR Exam Bank • ALLIED_1066 NAT • 2 Marks

Section 2: Farm Machinery

Machine Design

Subtopic: Gears and Gear Trains

Question Statement:

A spur gear pair has a pinion with 20 teeth and a gear with 60 teeth. If the module is 4 mm, the center distance (in mm) between the shafts is:

Answer Key:

160

Step-by-Step Solution & Explanation

Pitch circle diameters: $d_1 = m T_1 = 4 \times 20 = 80\text{ mm}$, $d_2 = m T_2 = 4 \times 60 = 240\text{ mm}$. Center distance $C = \frac{d_1 + d_2}{2} = \frac{80 + 240}{2} = 160\text{ mm}$.
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