Question: What is the minimum number of arbitrarily chosen parallel planes in which the balancing mass/ masses may be placed for complete dynamic balance of a

What is the minimum number of arbitrarily chosen parallel planes in which the balancing mass/ masses may be placed for complete dynamic balance of a system of unbalanced revolving masses in different transverse planes of a rotating shaft?

(a) 1

(b) 2

(c) 3

(d) 4 .

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