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Bidirectional AC Switching

In which application would you select a TRIAC over a regular SCR?

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Answer & Explanation

Correct AnswerD. For controlling bidirectional AC power to a lamp.

Quick Explanation

A TRIAC can conduct in both directions and is therefore well suited to phase control of AC loads such as lamps, heaters and small motors. A conventional SCR is unidirectional.

Bidirectional AC Switching explanatory diagram

Detailed Explanation

Correct Answer

D — For controlling bidirectional AC power to a lamp.

Explanation

A TRIAC can conduct in both directions and is therefore well suited to phase control of AC loads such as lamps, heaters and small motors. A conventional SCR is unidirectional.

Key Concept

Bidirectional AC Switching

Exam Point

TRIAC = bidirectional AC switch.

Quick Trick

TRIAC = bidirectional AC switch.

Exam Tip

TRIAC = bidirectional AC switch.

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01 ADDITIONAL ASSISTANT ENGINEER.pdf2026Q. 88

Bidirectional AC Switching

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