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asked in tom by (215k points)
Which of the following statement is corre         

1.   If a rotor is statically balanced it is always dynamically balanced also.

2.   If a rotor is dynamically balanced, it must be statically balanced

3.   If a rotor is dynamically balanced, it may or may not be statically balanced

4.   If a rotor is statically balanced, it may or may not be dynamically balanced.

         (a) 1 and 2 only              (b) 2 and 4 only

         (c) 2 and 3 only              (d) 1 and 4 only

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