Machine Design
The objective of 'crowning' of the flat pulleys of belt drive is to

Increase the belt velocity
Prevent the belt joint from damaging the belt surface
Prevent the belt from running off the pulley
Increase the power transmission capacity

ANSWER DOWNLOAD EXAMIANS APP

Machine Design
The contact ratio is the ratio of

Length of arc of approach to the circular pitch
Length of arc of contact to the circular pitch
Length of arc of recess to the circular pitch
Length of path of contact to the circular pitch

ANSWER DOWNLOAD EXAMIANS APP