IESL Part II Electrical Practice Questions - IESL Qualifying Examination Part II - Electrical Engineering Exam

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Which of the following describes the phase relationship between the primary and secondary line voltages in a three-phase transformer with a Dy11 vector group?

Secondary line voltage is in phase with the primary line voltage. Secondary line voltage lags the primary line voltage by 30 degrees. Secondary line voltage leads the primary line voltage by 30 degrees. Secondary line voltage leads the primary line voltage by 180 degrees.

Correct Answer:

Secondary line voltage leads the primary line voltage by 30 degrees.

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