Advanced Qualification · A-002 Advanced components and circuits · A-002-005-005
The silicon controlled rectifier (SCR) is what type of device?
- ANPPN
- BPNNP
- CPPNN
- DPNPN
Correct answer: D — PNPN. From the official ISED question bank, verified word for word.
Why
A silicon controlled rectifier, or SCR, is built from four layers of semiconductor material arranged in an alternating pattern of positive and negative types, specifically starting with a positive layer, then negative, then positive, and finally negative again. The full explanation — and one for every question — is in Pro.
Practise this section
Advanced components and circuits is section A-002 of the Advanced exam: Advanced components and circuits: semiconductors, amplifier classes, oscillators, mixers, filters and digital logic.
Drill A-002 — free, no account