A. output voltage fluctuation from no load to full load is the least.
B. output voltage fluctuation with power factor is least.
C. difference between primary and secondary voltage is the least.
D. difference between primary and secondary voltage is maximum.
Answer: A
Explanation:
- Good voltage regulation means minimum regulation i.e. less fluctuation in full load voltage compared to no-load voltage.
- Efficiency: Efficiency (η) of a transformer is the ratio of output to input. The transformer with fewer losses gives high efficiency. So, the transformer with higher efficiency is desired.
- Voltage Regulation can be defined as the drop in receiving end voltage from no load to full load expressed as a percentage of the full load receiving end voltage.
- For a transmission line, it is expected that the receiving end and sending end voltage are the same.
- Therefore, a better voltage regulation means a less voltage drop and hence a lower value of voltage regulation.
- The ideal voltage regulation should be zero.
- Zero voltage regulation indicates that there is no difference between its no-load and its full-load voltage.
- This is not practically possible and is only valid theoretically for ideal devices.
- Therefore, for the practical application, it should be as low as possible for the proper operation of the electrical devices.