Question 520Electricity & Electronics - QMED
70% to passIn figure "2" of the diagram shown in the illustration, the three phase power transformer has a step-down turns ratio of four to one. If a three-phase 440 volt supply is connected to terminals 'A1-B1-C1’, what voltage should develop across terminals 'A2-B2-C2'? Illustration EL-0084
A64 volts
B110 volts
C190 volts
D762 volts
AI Explanation
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.
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