Question 524Electricity & Electronics - Assistant Engineer

70% to pass

In referring to figure "E" of the illustration, what statement is true concerning the functional purpose of the coupling transformer? Illustration EL-0075

Diagram for USCG Electrical Assistant: In referring to figure "E" of the illustration, what statement is true...

AThe transformer functions as a filter by removing the DC component from the varying DC input to produce an AC output shifted 90o from the input.

BThe transformer functions as a filter by removing the DC component from the varying DC input to produce an AC output in phase with the input.

CThe transformer functions as a voltage transformer by changing the magnitude of the peak to peak AC voltage at the output proportional to the turns ratio.

DThe transformer functions as a filter by removing the DC component from the varying DC input to produce an AC output shifted 180o from the input.

AI Explanation

The correct answer is A. The coupling transformer functions as a filter by removing the DC component from the varying DC input to produce an AC output shifted 90 degrees from the input. This is because the transformer is designed to only pass the AC component of the signal, while blocking the DC component. This shifting of the output signal by 90 degrees is a characteristic of how transformers operate. The other options are incorrect because they do not accurately describe the functional purpose of the coupling transformer. Option B is incorrect as the output is not in phase with the input. Option C is incorrect as the transformer is not functioning as a voltage transformer. Option D is incorrect as the output is shifted 90 degrees, not 180 degrees, from the input.

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