Question 306Electricity/Electronics - QMED70% to pass
If the line voltage to the controller shown in the illustration is 440 volts, what is applied across the control circuit assuming the control transformer has a 4:1 turns ratio? Illustration EL-0080
AI Explanation
The correct answer is A) 110 volts.
With a 4:1 turns ratio, the control transformer steps down the 440-volt line voltage to 110 volts across the control circuit. This is because the turns ratio of the transformer determines the voltage transformation, so a 4:1 ratio means the secondary (control circuit) voltage will be 1/4 of the primary (line) voltage.
The other options are incorrect because 220 volts (B) is not the correct stepped-down voltage, 440 volts (C) is the original line voltage, and 660 volts (D) does not match the 4:1 turns ratio.
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