In a tap changer, the voltage at consumer terminals is kept within the prescribed limits by varying the
- A. Ratio of turns between primary and secondary windings
- B. Frequency
- C. Flux density in core
- D. Angle between magnetic axis of the primary and secondary windings
Answer: A. Ratio of turns between primary and secondary windings
Explanation: An on-load tap changer adjusts the effective turns ratio (N1/N2) between primary and secondary windings to maintain terminal voltage within permissible limits.