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

Spiral gearing
Spur gearing
Helical gearing
Bevel gearing

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Machine Design
The contact ratio is the ratio of

Length of arc of contact to the circular pitch
Length of arc of approach to the circular pitch
Length of path of contact to the circular pitch
Length of arc of recess to the circular pitch

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