See first figure attached.
The Attempt at a Solution
For this question I understand parts 1) and 2) entirely and have obtained the correct answers from the solutions.
I am confused about part 3) and I think my confusion stems out from confusion related to the rated voltages of a transformer.
Please take a look at the 2nd figure attached.
In this figure, where are the rated voltages of a transformer?
Would they be at E1 and E2? Or are they V1 and V2?
Once that is sorted out I have one more confusion to figure out.
In part 3) they tell you it is at rated load. Rated load means rated current, but rated current doesn't always imply rated voltage! (Only if you have the rated power, correct?)
How is it that in the calculation for the voltage regulation they assume rated voltage of 1000V?