Question 158Electricity & Electronics - 1st Asst/Chief

70% to pass

The turn’s ratio of the step-down transformer with dual voltage secondary shown in figure "B" of the illustration is two to one (total). If 220 volts were applied to terminals 'H1' and 'H2', what would be measured across 'X3' and 'X4'? Illustration EL-0082

Diagram for USCG Electrical Chief: The turn’s ratio of the step-down transformer with dual voltage secondary shown...

A55 volts

B110 volts

C440 volts

D880 volts

AI Explanation

The correct answer is A) 55 volts. In a step-down transformer with a 2:1 turns ratio, the secondary voltage will be half the primary voltage. Since the primary voltage is 220 volts, the secondary voltage across terminals X3 and X4 will be 220 volts / 2 = 110 volts. The other options are incorrect because: B) 110 volts is the voltage across the entire secondary winding, not just terminals X3 and X4. C) 440 volts and D) 880 volts are incorrect as they do not match the 2:1 turns ratio of the transformer.

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