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A 3-phase wound rotor induction motor, when started with load connected to its shaft, was found to start but settle down at about half synchronous speed. If the rotor winding as well as stator winding were star-connected, the cause of the malfunctioning could be attributed to | |
A. | one of the stator phase winding being short-circuited. [Wrong Answer] |
B. | one of the supply fuses being blown. [Wrong Answer] |
C. | one of the rotor phase being open-circuited. [Correct Answer] |
D. | two of the rotor phases being open-circuited [Wrong Answer] |