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

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

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Machine Design
Crowning on pulley helps

In increasing the slip of the belt
To increase pulley life
In decreasing the slip of the belt
To keep the belt in centre on a pulley while it is in motion

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