Transformer Multiple Choice Questions and Answers


21. The transformer ratings are usually expressed in.......

   A.Volts

   B.Amperes

   C.Kw

   D.Kva


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D.Kva

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22. Which of the following does not change in an ordinary transformer........

   A.Frequency

   B.Voltage

   C.Current

   D.Any of the above


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A.Frequency

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23. Star/star transformers work satisfactorily when........

   A.Load is unbalanced onlyα

   B.Load is balanced onlyα

   C.On balanced as well as unbalanced loadsα

   D.None of the aboveα


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B.Load is balanced onlyα

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24. Delta/star transformer works satisfactorily when........

   A.Load is balanced only

   B.Load is unbalanced only

   C.On balanced as well as unbalanced loads

   D.None of the above


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C.On balanced as well as unbalanced loads

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25. Harmonics in transformer result in........

   A.Increased core losses

   A.Increased I2R losses

   C.Magnetic interference with communication circuits

   D.All of the above


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D.All of the above

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