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While a 2-phase ac servomotor is in operation, if the voltage across the control field winding becomes zero, then the motor has a tendency to run as a single phase induction motor. To prevent this | |
A. | rotor having high mass moment of inertia is used for such a motor [Wrong Answer] |
B. | drag cup type of light rotor and high resistance is preferred. [Correct Answer] |
C. | a low resistance is used. [Wrong Answer] |
D. | the number of turns in the control field winding used is less than the main reference winding. [Wrong Answer] |