Machine Design
The piston pin bearings in heavy duty diesel engines are

Cylindrical roller bearings
Needle roller bearings
Tapered roller bearings
Spherical roller bearings

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Machine Design
In case of V belt drive

The belt should touch the bottom of groove in the pulley
The belt should not 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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