Question

What are the working regions of a unijunction transistor?

(a) Linear region

(b) Negative Resistance region

(c) Saturation region

(d) Cut-off region

I have been asked this question in an international level competition.

I need to ask this question from The Unijunction Transistors topic in division Field-Effect Transistors of Electronic Devices & Circuits

Answer 1

Correct option is (b) Negative Resistance region

To explain: As soon as the transistor reaches the triggering voltage the unijunction transistor will turn on. If the applied voltage increases to the emitter lead, the peak voltage is achieved. The voltage drops from peak voltage to Valley Point. This happens in spite of the current increasing; this is because of the negative resistance.