Theory of Machine
When the axes of the first and last wheels are coaxial, then the train is known as

Epicyclic gear train
Compound train of wheels
Reverted gear train
Simple train of wheels

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Theory of Machine
The Ackerman steering gear mechanism is preferred to the Davis steering gear mechanism, because

Both (A) and (B)
The Ackerman steering gear is most economical
The Ackerman steering gear consists of turning pairs
Whole of the mechanism in the Ackerman steering gear is on the back of the front wheels

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