1) When was invented SCR?
Correct Answer: 1956
2) Which is having terminals for Anode, Cathode and Gate?
Correct Answer: SCR
3) Which one is four layer (PNPN) construction?
Correct Answer: SCR
Explanation:

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4) What is stands for TRIAC?
Correct Answer: Triode AC semiconductor
5) Which is having three terminals for MT1, MT2 and Gate?
Correct Answer: TRIAC