BJIt Amplifiers Questions and Answers
BJIt Amplifiers questions with answers cover one of the most fundamental topics in electronics aptitude. Understanding transistor biasing, small-signal analysis, and amplifier configurations like CE, CB, and CC is key for exams such as GATE, DRDO, and ISRO. This section presents multiple-choice aptitude questions with detailed explanations, helping students master amplifier characteristics, gain calculations, and frequency responses. Practicing these electronics aptitude questions builds confidence for competitive exams and placement tests requiring deep conceptual understanding of analog circuits.
BJIt Amplifiers
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46 questions
12. What is the range of the current gain for BJT transistor amplifiers?
- less than 1
- 1 to 100
- above 100
- All of the above
13. What does the negative sign in the voltage gain of the common-emitter fixed-bias configuration indicate?
- The output and input voltages are 180º out of phase.
- Gain is smaller than 1.
- Gain is larger than 1.
- None of the above
14. For the common-emitter fixed-bias configuration, there is a ________ phase shift between the input and output signals.
- 0º
- 45º
- 90º
- 180º
15. Which one of the following configurations has the lowest input impedance?
- Fixed-bias
- Common-base
- Emitter-follower
- Voltage-divider?
16. Which of the following represent(s) the advantage(s) of the system approach over the r-model approach?
- Thevenin's theorem can be used.
- The effect of changing the load can be determined by a simple equation.
- There is no need to go back to the ac equivalent model and analyze the entire network.
- All of the above
17. The differential amplifier has
- one input and one output.
- two inputs and two outputs.
- two inputs and one output.
- one input and two outputs.
18. The emitter-follower configuration has a ________ impedance at the input and a ________ impedance at the output.
- low, low
- low, high
- high, low
- high, high
19. The differential amplifier produces outputs that are
- common mode.
- in-phase with the input voltages.
- the sum of the two input voltages.
- the difference of the two input voltages.
20. The ________ configuration is frequently used for impedance matching.
- fixed-bias
- voltage-divider bias
- emitter-follower
- collector feedback