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

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

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Theory of Machine
Oldham's coupling is the

Third inversion of slider crank chain
Second inversion of single slider crank chain
Third inversion of double slider crank chain
Second inversion of double slider crank chain

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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
Gear teeth are undercut
Pitch of the gears is not same
Gears do not move smoothly in the absence of lubrication

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