Extra exam question E6F07
Subelement E6, CIRCUIT COMPONENTS· Group E6F
What is a solid-state relay?
- A.A relay that uses transistors to drive the relay coil
- B.A device that uses semiconductors to implement the functions of an electromechanical relay (correct answer)
- C.A mechanical relay that latches in the on or off state each time it is pulsed
- D.A semiconductor switch that uses a monostable multivibrator circuit
WhyA solid-state relay is a device that uses semiconductors to implement the functions of an electromechanical relay. A solid-state relay uses semiconductor devices, typically an optoisolator driving a triac or similar switching element, to perform the same basic switching function an electromechanical relay does, but without any moving parts or a physical coil and contacts, answer B. It isn't simply a transistor-driven electromechanical relay coil, isn't a mechanical latching relay, and isn't specifically built around a monostable multivibrator, those don't describe what makes a solid-state relay "solid-state."
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
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