A Semiconductor Controlled Rectifier (SCR) is a solid-state device containing how many PN junctions?
A4 PN junctions
B3 PN junctions
C1 PN junction
D2 PN junctions
Explanation
An SCR is a 4-layer (P-N-P-N) semiconductor device with 3 PN junctions (J1, J2, J3) and 3 terminals (Anode, Cathode, Gate).

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