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Power Electronics - Section 2 Question & Answers

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2023/2024 Written for academic year
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Course Electronics
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Power Electronics - Section 2 Question & Answers A 3 phase ac regulator uses A. 3 thyristors B. 6 thyristors C. 9 thyristors D. 12 thyristors - ANSWER: B Two thyristors for each phase. A 3 phase bridge inverter is fed by 400 V battery. The load is star connected and has a resistance of 10 Ω per phase. The peak value of load current is A. 40 A B. 20 A C. 10 A D. 5 A - ANSWER: B Two resistances are in series at any time. A dc circuit breaker must use A. natural commutation B. forced commutation C. both natural and forced commutation D. either natural or forced commutation - ANSWER: B Natural commutation is possible only in ac circuits. A dc separately excited motor has a constant field current. The armature is fed from a single phase supply through a semi-converter. When a = 0, speed is 600 rpm. If a = 90°, the speed is likely to be A. about 300 rpm B. about 150 rpm C. about 75 rpm D. about zero - ANSWER: A

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