Machine Design
The rolling contact bearings as compared to sliding contact bearings have

Accuracy of shaft alignment
Low starting and low running friction except at very high speeds
All of these
Small overall dimensions

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Machine Design
When a belt drive is transmitting maximum power,

Effective tension is half of centrifugal tension
Effective tension is equal to centrifugal tension
Driving tension on slack side is equal to centrifugal tension
Driving tension on tight side is twice the centrifugal tension

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