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

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

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Machine Design
Stress concentration is caused due to

All of these
Variation in properties of material from point to point in a member
Abrupt change of section
Pitting at points or areas at which loads on a member are applied

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