Transformers

21. Which of the following is not a routine test on transformers?

Core insulation voltage test
Impedance test
Radio interference test
Polarity test

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22. Two transformers operating in parallel will share the load depending upon their

leakage reactance
per unit impedance
efficiencies
ratings

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23. Which of the following is the most likely source of harmonics in a transformer?

poor insulation
Overload
loose connections
Core saturation

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