Commutation Overlap MCQs

Practice Commutation Overlap MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 1

Power ElectronicsCommutation Overlap

Source inductance in a practical controlled rectifier causes commutation overlap because?

ACurrent transfer between devices cannot occur instantaneously
BGate pulses become DC
CLoad resistance becomes infinite
DSupply frequency becomes zero

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Correct Answer: A. Current transfer between devices cannot occur instantaneously

Explanation: Inductance opposes instantaneous current change, so outgoing and incoming devices conduct simultaneously for a finite overlap interval.

Reference: Standard power electronics: commutation overlap

Question 2

Power ElectronicsCommutation Overlap

Increasing commutation overlap in a line-commutated converter generally causes the average DC output voltage to?

ADecrease
BIncrease without limit
CRemain exactly unchanged
DBecome equal to peak line voltage

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Correct Answer: A. Decrease

Explanation: Commutation overlap introduces an additional voltage drop/loss of average output voltage.

Reference: Standard power electronics: commutation overlap