Machine Design
If a bearing is designated by the number 305, it means that the bearing is of

Light series whose bore is 5 mm
Medium series whose bore is 5 mm
Light series whose bore is 25 mm
Medium series whose bore is 25 mm

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Machine Design
In case of thick cylinders, the tangential stress across the thickness of cylinder is

Maximum at the inner surface and zero at the outer surface
Maximum at the outer surface and zero at the inner surface
Maximum at the outer surface and minimum at the inner surface
Maximum at the inner surface and minimum at the outer surface

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