Discussion
How many SCRs are required in single-phase half-wave controlled rectifier?
Answer: B
One SCR is needed in a single phase half wave controlled rectifier. The thyristor conducts in the positive half cycle, after it is triggered at the firing angle, and blocks in the negative half cycle, so the one device controls the output.
Zero would be an uncontrolled circuit with a diode. Two SCRs would be used in a full wave controlled rectifier with a centre tap or in a half controlled bridge, and four would be used in a full controlled bridge. So the second option is the answer.
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