Theory of Machine
To connect two parallel and coplanar shafts the following type of gearing is used

Spiral gear
None of the listed here
Spur gear
Bevel gear

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Theory of Machine
In a mechanism, the fixed instantaneous centers are those centers which

Remain in the same place for all configurations of the mechanism
None of the listed here
Vary with the configuration of the mechanism
Moves as the mechanism moves, but joints are of permanent nature

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