Lineman's Test C Practice

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For a transformer with primary 2400 V and secondary 4160 V, if the primary is supplied with 2400 V, the secondary voltage is:

120 V 240 V 2400 V 4160 V

Correct Answer:

4160 V

Explanation:

Voltage scales with the turns ratio in an ideal transformer. The secondary voltage equals the primary voltage multiplied by the turns ratio (Ns/Np). For this transformer, the ratio is 4160/2400 ≈ 1.733. So applying 2400 V to the primary yields about 4160 V on the secondary. In real operation, small losses and regulation can cause minor differences, but the nominal secondary voltage follows the turns ratio.

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