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Which of the following statements associated with a Sehrage motor is/are correct? | |
A. | The magnitude of the slip frequency voltage injected into the secondary circuit depends upon the spacing between the two sets of brushes, and the phase depends on their angular position with respect to centre of the rotor winding. [Wrong Answer] |
B. | When the two sets of brushes of each phase are making contact with the same commutator bar, the secondary is short-circuited and the motor operates as an ordinary induction motor. [Wrong Answer] |
C. | Its power factor can be varied by rocking the brushes as a whole round the commutator. [Wrong Answer] |
D. | all of the above. [Correct Answer] |