Discussion
For a germanium transistor, which of the following is not a sufficient magnitude of VBB to provide the necessary forward emitter-base bias?
Answer: C
The insufficient bias is \(V_{BB} \lt 0.2\) V.
A germanium junction needs a forward voltage of about 0.2 to 0.3 V before appreciable current flows (a silicon junction needs about 0.7 V). A base supply below 0.2 V cannot overcome the emitter-base barrier, so the transistor stays cut off.
0.7 V, anything above 0.7 V, and the range between 0.2 V and 0.7 V all reach or exceed the germanium cut-in voltage, so they can provide the forward bias the question asks about.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development