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

Only A is correct
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

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Machine Design
Set screws are

Similar to small size tap bolts except that a greater variety of shapes of heads are available
Similar to stud
Used to prevent relative motion between parts
Slotted for a screw driver and generally used with a nut

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