The current gain of a BJT is__________?
Correct answer: C. gm rπ
- A. gm r0
- B. gm / r0
- C. gm rπ
- D. gm /rπ
Explanation
For a BJT, the small-signal current gain is approximately β = gm rπ, since gm relates collector current to base-emitter voltage and rπ relates that voltage to base current. Hence option c is correct.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
Practise Electronics and Devices
758 free Electronics and Devices MCQs from Electrical Engineering, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Electrical Engineering questions like this
Electrical Engineering is on 2 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Electronics and Devices questions
To prevent a DC return between source and load, it is necessary to use___________?
Voltage Series feedback also called series-shunt feedback) results in__________?
In a transistor leakage current mainly depends on__________?
An amplifier without feedback has a voltage gain of 50,input resistance os 1 KΩ & Output resistance of 2.5KΩ.The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 is___________?
In the differential voltage gain & the common mode voltage gain of a differential amplifier are 48db &2db respectively, then its common mode rejection ratio is__________?
The parameter hie stands for input impedance in _____________?