Theory of Machine
In railway axle boxes, the bearing used is

Cylindrical roller bearing
Double row spherical roller bearing
Deep groove ball bearing
Double row self aligning ball bearing

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

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