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Speed control of a universal motor is achieved by | |
A. | varying field flux with tapped field windings [Wrong Answer] |
B. | connecting rheostat in series [Wrong Answer] |
C. | applying variable voltage by means of silicon cofitrolled rectifier [Wrong Answer] |
D. | applying variable voltage by means of variable auto-transformer [Wrong Answer] |
E. | all of the above methods [Correct Answer] |