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

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

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Machine Design
A compound belt drive is used when

Shafts are arranged parallel and rotate in the same directions
None of these
Shafts are arranged at right angles and rotate in one definite direction
Shafts are arranged parallel and rotate in the opposite directions

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