Which one of the following is not the correct statement with respect to the involute profile toothed gears in mesh?
1
Pressure angle remains constant from the start till the end of the engagement.
2
The base circle diameter and the pitch circle diameter of the two mating involutes are proportional.
3
When two involutes are in mesh, the angular velocity ratio is proportional to the size of the base circles.
4
The shape of the involute profile depends only on the dimensions of the base circle.