Question 249Electricity & Electronics - Assistant Engineer

The correct answer is B) 110 volts. The turns ratio of the three-phase step-down transformer is 4:1, meaning that for every 4 turns on the primary side, there is 1 turn on the secondary side. Since the primary voltage is 440 volts, the secondary voltage can be calculated by dividing 440 volts by the turns ratio of 4, which results in 110 volts. The other options are incorrect because: A) 64 volts is too low for a 4:1 step-down transformer. C) 190 volts is too high for a 4:1 step-down transformer. D) 762 volts is the primary voltage multiplied by the turns ratio, which is not the secondary voltage.