Theory of Machine
A kinematic chain requires at least

4 links and 4 turning pairs
3 links and 4 turning pairs
2 links and 3 turning pairs
5 links and 4 turning pairs

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Theory of Machine
A rotor which is balanced statically but not dynamically is supported on two bearings L apart and at high speed of the rotor, reaction on the left bearing is R. The right side of the bearing is shifted to a new position 2L apart from the left bearing. At the same rotor speed, dynamic reaction on the left bearing in the new arrangement will

Remain same as before
Become equal to 2R
Become equal to R/4
Become equal to R/2

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