Question

63. If the converted gear train speed ratio of the epicyclic gear train iH
AB is negative, then ...........
A. rotating direction of gear A and B is contrary in the converted gear train, and is also
contrary in the epicyclic gear train
B. rotating direction of gear A and B is contrary in the converted gear train, and is the
same in the epicyclic gear train
C. rotating direction of gear A and B is contrary in the converted gear train, and can not
be determined in the epicyclic gear train
D. plus-or-minus sign is only on behalf of the ratio of angular velocity of the converted
gear train, there is no special meaning

Answer 1

Answer:

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