1.
A _____________, also known as Silicon Controlled Rectifier (SCR), is a three-terminal power electronic device used in various electronic applications like rectifiers, SMPS, etc., as a switching device. It has three terminals — Anode, Cathode, and Gate.
A
Thyristor
B
Inductor
C
Transistor
D
Transformer
Answer and explanation
Correct Answer: A — Thyristor
A Thyristor (SCR) is a four-layer PNPN semiconductor device with three terminals: Anode, Cathode, and Gate. It acts as a bistable switch, remaining OFF until a gate trigger turns it ON, after which it conducts until current drops below the holding level. Inductors, transistors, and transformers do not match this description.