Technician A says that the pitch line diameter of a spur gear exceeds its root diameter.Technician B says that when a pair of gears are properly in mesh,there should be contact between the apex (outside diameter)of each gear tooth with its opposite's root.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question

Quizplus · Accepted Answer

The pitch line diameter of a spur gear is indeed larger than its root diameter, which is the base of the gear teeth. Technician B is incorrect because in a properly meshed gear pair, the contact should occur along the sides of the teeth, not between the apex of one tooth and the root of its opposite.

Technician a Says That the Pitch Line Diameter of a Spur