# In a gear having involute teeth, the normal to the involute is a tangent to the

+1 vote
In a gear having involute teeth, the normal to the involute is a tangent to the

(a) pitch circle

(b) base circle

(c) addendum circle

(d) dedendum circle

I got this question during an online interview.

Origin of the question is Comparison Between Involute and Cycloidal Gears topic in section Toothed Gearing & Gear Trains of Machine Kinematics

## 1 Answer

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by (92.2k points)
Correct answer is (b) base circle

Explanation: Addendum circle is the circle drawn through the top of the teeth and is concentric with the pitch circle.

Dedendum circle is the circle drawn through the bottom of the teeth. It is also called root circle.

Pitch circle is an imaginary circle which by pure rolling action, would give the same motion as the actual gear.

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