An SCR can exercise control over____________of a.c. supply?
Correct answer: D. Positive or negative half-cycles
- A. Positive half-cycles only
- B. Negative half-cycles only
- C. Both positive and negative half-cycles
- D. Positive or negative half-cycles
Explanation
An SCR conducts only when forward biased and triggered, so its orientation determines whether it controls the positive or negative half-cycle. With suitable circuit arrangement, either half-cycle can be controlled, but not both with one ordinary SCR.
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