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

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

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Theory of Machine
A point B on a rigid link AB moves with respect to A with angular velocity ω rad/s. The total acceleration of B with respect to A will be equal to

Vector difference of radial component and tangential component
Vector sum of radial component and Coriolis component
Vector sum of radial component and tangential component
Vector sum of tangential component and Coriolis component

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Theory of Machine
Pitch point on a cam is

The point on cam pitch curve having the maximum pressure angle
The point on cam pitch curve having the minimum pressure angle
Any point on pitch circle
Any point on pitch curve

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