Theory of Machine
The balancing of a rigid rotor can be achieved by appropriately placing balancing masses in

Three planes
A single plane
Two planes
Four planes

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Theory of Machine
In a mechanism, the fixed instantaneous centers are those centers which

Remain in the same place for all configurations of the mechanism
None of the listed here
Vary with the configuration of the mechanism
Moves as the mechanism moves, but joints are of permanent nature

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