Power Electronics - Section 6 Question & Answers
Power Electronics - Section 6 Question & Answers A 3 phase induction motor is controlled by voltage and frequency control such that the ratio V/f is constant. At 50 Hz, the starting torque is 100 N-m. At 25 Hz, the starting torque A. will be less than 100 N-m B. will be more than 100 N-m C. may be more or less than 100 N-m depending on motor parameters D. very small - ANSWER: B A cycloconverter for single phase operation has A. one positive group and one negative group converters B. two positive group and two negative group converters C. three positive group and three negative group converters D. any of the above - ANSWER: A A dc chopper is feeding an RLE load. The current can become discontinuous if A. R/L is high B. a is low C. E is high D. none of the above - ANSWER: D A NAND gate has 3 inputs and one output. The number of thyristors required for this gate are A. 1
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