Machine Design
When two helical springs of equal lengths are arranged to form a cluster spring, then

Shear stress in each spring will be equal
Both A and B is correct
Load taken by each spring will be half the total load
Only A is correct

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Machine Design
Stress concentration is caused due to

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

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