By which of the following methods the constant speed of a synchronous motor can be changed to new fixed value ?
(A) By changing the supply frequency
(B) By interchanging any two phases
(C) By changing the applied voltage
(D) By changing the load
By which of the following methods the constant speed of a synchronous motor can be changed to new fixed value ?
(A) By changing the supply frequency
(B) By interchanging any two phases
(C) By changing the applied voltage
(D) By changing the load
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