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MCQ Practice Question

Power Electronics AC Voltage Controllers

With a purely resistive load in an AC voltage controller, increasing the firing angle generally causes the RMS load voltage to?

ADecrease
BIncrease above the source RMS without a transformer
CRemain constant
DBecome DC

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Correct Answer: A. Decrease

Explanation: A larger firing delay reduces the conduction interval in each half-cycle, lowering the RMS output voltage.

Reference: Standard power electronics: ac voltage controllers

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