Correct option is D
In flat belt drives, crowning refers to the slightly convex shape given to the pulley surface. The purpose of crowning is to ensure that the belt remains centered on the pulley and does not slip off during operation.
· Due to the natural tendency of a belt to move towards the larger diameter, crowning helps in self-centering the belt, preventing misalignment.
· This eliminates the need for guide rollers, reducing wear and increasing belt life.
