Which one of the following is true for involute gears?
(a) Interference is inherently absent
(b) Variation in centre distance of shafts increases radial force
(c) A convex flank is always in contact with concave flank
(d) Pressure angle is constant throughout the teeth engagement
I had been asked this question in a national level competition.
This key question is from Reverted Gear Train in portion Toothed Gearing & Gear Trains of Machine Kinematics