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
21. When the bypass capacitor is removed from a common-emitter amplifier, the voltage gain
- increases.
- decreases.
- has very little effect.
22. In a common-base amplifier, the input signal is connected to the
- base.
- collector.
- emitter.
- output.
23. Which of the following is (are) true to achieve a good overall voltage gain for the circuit?
- The effect of Rs and RL must be considered as a product.
- The effect of Rs and RL must be considered as a product and evaluated individually.
- The effect of Rs and RL must be evaluated individually.
- None of the above
24. To analyze the common-emitter amplifier, what must be done to determine the dc equivalent circuit?
- leave circuit unchanged
- replace coupling and bypass capacitors with opens
- replace coupling and bypass capacitors with shorts
- replace VCC with ground
25. For the common-emitter amplifier ac equivalent circuit, all capacitors are
- effectively shorts.
- effectively open circuits.
- not connected to ground.
- connected to ground.
26. Which of the following define(s) the conversion efficiency?
- Ac power to the load/ac input power
- Ac power to the load/dc power supplied
- Dc output power/ac input power
- All of the above
27. Which of the following should be done to obtain the ac equivalent of a network?
- Set all dc sources to zero
- Replace all capacitors by a short-circuit equivalent.
- Remove all elements bypassed by the short-circuit equivalent.
- All of the above
28. For the collector dc feedback configuration, there is a ________ phase shift between the input and output signals.
- 0º
- 45º
- 90º
- 180º
29. The total gain of a multistage amplifier is the ________.
- sum of individual voltage gains
- sum of dB voltage gains
30. Which of the following configurations has an output impedance Zo equal to RC?
- Fixed-bias common-emitter
- Common-emitter voltage-divider with bypass capacitor
- Common-emitter voltage-divider without bypass capacitor
- All of the above