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Exam (elaborations)

Power Electronics - Section 8 Question & Answers

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2023/2024 Written for academic year
Institution Electronics
Course Electronics
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Power Electronics - Section 8 Question & Answers A crowbar circuit is generally needed for protection under fault conditions. A. True B. False - ANSWER: A A dc series motor is coupled to a load whose torque is proportional to speed. It is fed by a single phase ac supply through a full converter. When speed is 500 rpm, firing angle is 45°. It is desired to raise the speed. It will be necessary to A. decrease the firing angle B. increase the firing angle C. either decrease or increase the firing angle depending on the required speed D. decrease the load torque - ANSWER: A A LASCR has A. 4 semiconductor layers and 3 junctions B. 3 semiconductor layers and 2 junctions C. 2 semiconductor layers and 2 junctions D. any of these depending on the rating - ANSWER: A A single phase cycloconverter with centre tapped input transformer requires A. 2 thyristors B. 4 thyristors

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