Consider the following statement regarding DIAC.

Solution

DIAC (Diode for Alternating Current): ●       A DIAC is a  bidirectional semiconductor switching device . It remains non-conducting until its breakover voltage (typically 20–40 V) is reached, after which it conducts in either direction.
●       Because it works in both directions, it is widely used in  AC circuits  for triggering other devices like the TRIAC.
●       Unlike a normal diode, it does not have polarity in conduction once triggered, making it useful as a  symmetrical AC switch . Now check the statements: 1. DIAC is unidirectional device  →  False , because DIAC conducts in  both directions  (bidirectional). 2. DIAC can be used for triggering TRIAC  →  True , DIAC ensures sharp, symmetrical triggering for TRIACs in light dimmers, motor speed control, etc. 3. DIAC can be used as an AC switch  →  True , since it can conduct in both directions after breakover voltage is reached.