Question 520Electricity & Electronics - QMED

The correct answer is B) 110 volts. The key information provided is that the three-phase power transformer in the diagram has a step-down turns ratio of 4:1. This means that for every 4 turns on the primary winding (connected to the 440 volt supply), there is 1 turn on the secondary winding. With a 4:1 turns ratio, the output voltage on the secondary winding (terminals A2-B2-C2) will be 1/4 of the input voltage of 440 volts, which equals 110 volts. This is the correct answer. The other options are incorrect because they do not correctly apply the 4:1 step-down turns ratio to calculate the expected secondary voltage.