+1 vote
in Machine Kinematics by (38.0k points)
The angle subtended at the centre of a base circle from the origin of an involute to the point of tangency of the generatrix from any point on the same involute is known as

(a) pressure angle

(b) dedendum angle

(c) roll angle

(d) none of the mentioned

I had been asked this question at a job interview.

This is a very interesting question from Gearing in portion Toothed Gearing & Gear Trains of Machine Kinematics

1 Answer

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by (106k points)
Correct answer is (c) roll angle

To explain: The angle subtended at the centre of a base circle from the origin of an involute to the point of tangency of the generatrix from any point on the same involute is known as roll angle.

The angle between a tooth profile and a radial line at its pitch point is known as pressure angle.

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