Electrical Engineering XYZ MCQ on BJT.
Number of PN Junctions on BJT are:
- One
- Two
- Three
- Four
Correct answer: 2. Two
Also see: BJT Handbook
Explanation of MCQ
The BJT is constructed with three doped semiconductor regions separated by two pn junctions. The three regions are called emitter, base, and collector. The figure below depicts npn type of BJT in which two n regions are separated by a p region (npn). The term bipolar refers to the fact that both holes and electrons are used as current carriers in the transistor structure. Also see here: PN junction formation concepts
Also see: Top 10 Transistor Ratings