Machine Design
When two non-parallel or intersecting but coplanar shafts are connected by gears, the arrangement is known as,

Helical gearing
Bevel gearing
Worm gearing
None of these

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Machine Design
An open belt drive is used when

Shafts are arranged parallel and rotate in the same directions
Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft
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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