Machine Design
The connecting rod bolts are tightened up with initial tension greater than the external load so that

Joint may not open up
Bolts are weakest elements
The resultant load on the bolt would not be affected by the external cyclic load
Bolts will not loosen during service

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Machine Design
In case of V belt drive

The belt should not touch the bottom of groove in the pulley
The belt should touch the bottom of groove in the pulley
The belt should not touch the sides of groove in the pulley
None of these

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Machine Design
For same pulley diameters, center distance, belt speed and belt and pulley materials,

Power transmission does not depend upon open and crossed types of constructions
Crossed belt drive transmits more power than open belt drive
Open and crossed belt drives transmit same power
Open belt drive transmits more power than crossed belt drive

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