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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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