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

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

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Theory of Machine
In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is constant, then

Both open belt drive and crossed belt drive is recommended
The drive is recommended depending upon the torque transmitted
Crossed belt drive is recommended
Open belt drive is recommended

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