Advanced Qualification · A-002 Advanced components and circuits · A-002-005-004
Under what operating condition does a silicon controlled rectifier (SCR) exhibit electrical characteristics similar to a forward-biased silicon rectifier?
- A When it is gated "on"
- B When it is gated "off"
- C When it is used as a detector
- D During a switching transition
Correct answer: A — When it is gated "on". From the official ISED question bank, verified word for word.
Why
A silicon controlled rectifier acts like a standard one-way valve for electricity only after a small signal, called a gate pulse, switches it "on." Once triggered, it conducts current freely in the forward direction with very little resistance, just like a normal silicon rectifier diode. The full explanation — and one for every question — is in Pro.
Practise this section
Advanced components and circuits: semiconductors, amplifier classes, oscillators, mixers, filters and digital logic.