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Which one of the following statements is not correct in respect of synchronous machines? | |
A. | In salient pole machines, the direct-axis synchronous reactance is greater than the quadrature axis synchronous reactance. [Wrong Answer] |
B. | The damper bars help the motor to self start. [Wrong Answer] |
C. | Short-circuit ratio is the ratio of field current required to produce the rated voltage on open circuit to the rated armature current. [Correct Answer] |
D. | The V - curve of a synchronous motor represents the variation in armature current with field excitation at a given output power. [Wrong Answer] |