Machine Design
Oldham coupling is used to connect two shafts

Which are perfectly aligned
Whose axes intersect at a small angle
Which are not in exact alignment
Which have lateral misalignment

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Machine Design
Stress concentration is caused due to

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

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