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

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

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Machine Design
When the belt is transmitting maximum power,

The tension in tight side is thrice the centrifugal tension
The tension in tight side is twice the centrifugal tension
The tension in slack side is equal to the centrifugal tension
None of these

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