Q.

The phase sequence of a three-phase alternator will reverse if

  • AThe filed current is reversed keeping the direction of rotation same
  • BThe field current remains the same but the direction of rotation is reversed
  • CThe field current is reversed and the number of poles is doubled
  • DThe number of poles is doubled without reversing the field current.
Correct Answer : (B)

The field current remains the same but the direction of rotation is reversed

Hints :

The phase sequence of a three-phase alternator will reverse if the field current remains the same but the direction of rotation is reversed.

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