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.
B. The damper bars help the motor to self start.
C. Short-circuit ratio is the ratio of field current required to produce the rated voltage on open circuit to the rated armature current.
D. The V-curve of a synchronous motor represents the variation in armature current with field excitation at a given output power. [GATE E.E. 2005]
Answer:C
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. B. The damper bars help the motor to self start. C. Short-circuit ratio is the ratio of field current required to produce the rated voltage on open circuit to the rated armature current. D. The V-curve of a synchronous motor represents the variation in armature current with field excitation at a given output power. [GATE E.E. 2005]