Theory of Machine
The power from the engine to the rear axle of an automobile is transmitted by means of

Bevel gears
Hooke's joint
Spur gears
Worm and worm wheel

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Theory of Machine
The relation l = (2/3).(j + 2) apply only to kinematic chains in which lower pairs are used. This may be used to kinematic chains in which higher pairs are used, but each higher pair may be taken as equivalent to

Any one of these
Two lower pairs and one additional link
Two lower pairs and two additional links
One lower pair and two additional links

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