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

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

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Theory of Machine
A system of masses rotating in different parallel planes is in dynamic balance if the

Resultant force is equal to zero
Resultant force is numerically equal to the resultant couple, but neither of them need necessarily be zero
Resultant force and resultant couple are both equal to zero
Resultant couple is equal to zero

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