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

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

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Theory of Machine
In elliptical trammels

Three pairs turning and one pair sliding
Two pairs turning and two pairs sliding
All four pairs are turning
One pair turning and three pairs sliding

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