Tooth interference in an external in volute spur gear pair can be reduced by
(a) Decreasing center distance between gear pair
(b) Decreasing module
(c) Decreasing pressure angle
(d) Increasing number of gear teeth
This question was addressed to me by my school principal while I was bunking the class.
The above asked question is from Standard Spur Gears in portion Toothed Gearing & Gear Trains of Machine Kinematics