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

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

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Machine Design
Stress concentration is caused due to

All of these
Pitting at points or areas at which loads on a member are applied
Variation in properties of material from point to point in a member
Abrupt change of section

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Machine Design
A fast and loose pulley drive is used when

Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft
Shafts are arranged parallel and rotate in the same directions
Shafts are arranged parallel and rotate in the opposite directions
Shafts are arranged at right angles and rotate in one definite direction

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