Question

practical application of maximum power transformer theorem

Answer 1

i don't see the use of, without a purpose, deliberately seeking a lower power output than possible . If the purpose is to control power, then the maximum power transfer theorem will predict what can possibly be delivered by the system. The theorem is telling you the design is less than ideal if you measure something less, which is always true. You can ask yourself "Can I possibly improve the design?"

Answer 2

practical application might be seen on communication transmitters where transformers are very effective for circuit isolation purposes as well as matching impedance between RF stages... commonly primary and secondary circuit consist of inductive reactance sufficient for resonant or tuning requirements needed for communication circuits...