Question

That surface of the tooth which is between the pitch circle and the top of the tooth is known as

(a) cycloid

(b) addendum

(c) face of tooth

(d) none of the mentioned

This question was addressed to me in an interview for internship.

The question is from Gearing topic in chapter Toothed Gearing & Gear Trains of Machine Kinematics

Answer 1

Correct answer is (c) face of tooth

To explain I would say: The circle from which an involute curve is generated is known as base circle.

The curve formed by the point on a circle as it rolls along a straight line is known as cycloid.

That surface of the tooth which is between the pitch circle and the top of the tooth is known as face of tooth.