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

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

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Theory of Machine
In gears, interference takes place when

The tip of a tooth of a mating gear digs into the portion between base and root circles
Gears do not move smoothly in the absence of lubrication
Gear teeth are undercut
Pitch of the gears is not same

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