Interference can be avoided in involute gears with 20° pressure angle by
(a) cutting involute correctly
(b) using as small number of teeth as possible
(c) using more than 20 teeth
(d) using more than 8 teeth
I got this question in examination.
The question is from Toothed Gearing in chapter Toothed Gearing & Gear Trains of Machine Kinematics