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When a Scharge motor runs exactly at synchronous speed, then | |
A. | secondary voltage E2 comes into phase with primary back e.m.f. E1 [Wrong Answer] |
B. | the speed of the motor field relative to that of regulating winding becomes zero [Wrong Answer] |
C. | voltage injected from the compensation winding into secondary becomes equal and opposite to the secondary induced voltage [Wrong Answer] |
D. | it behaves, in a sense, like a synchronous motor with compensating winding functioning as D.C. excite. [Correct Answer] |