Answer: D. Frequency
Frequency remains the same on both sides of all transformers.
Only for the isolation transformer, the current and voltage on both sides of the transformer are the same, in all other transformers the current and voltage depend on the turn ratio of the transformer.
- For an ideal transformer power on both sides is equal, but in practice, there is some power loss in the core and windings of the transformer, hence it will not be true for the practical transformer.
- Among the given options only frequency is the quantity that remains the same on both sides of all transformers.
Hence option D is the correct answer.
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