Which of the following tests don’t indicate that transformer will work satisfactorily for at least 30 Years?

Which of the following tests don’t indicate that transformer will work satisfactorily for at least 30 Years? Correct Answer Temperature rise

Tests to prove that the transformer will be satisfactory in service for at least 30 years. The tests in this category are the most important and the most difficult to frame: they include all the dielectric or overvoltage tests, and load current runs.
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