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
31. For a common-emitter amplifier, the purpose of the emitter bypass capacitor is
- no purpose, since it is shorted out by RE.
- to reduce noise.
- to despike the supply voltage.
- to maximize amplifier gain.
32. For BJT amplifiers, the ________ gain typically ranges from a level just less than 1 to a level that may exceed 1000.
- voltage
- current
- impedance
- All of the above
33. The loaded voltage gain of an amplifier is always more than the no-load level.
- TRUE
- FALSE
34. What is the limit of the efficiency defined by = Po / Pi?
- Greater than 1
- Less than 1
- Always 1
- None of the above
35. Which of the following techniques can be used in the sinusoidal ac analysis of transistor networks?
- Small-signal
- Large-signal
- Small- or large-signal
- None of the above
36. The input impedance of a BJT amplifier is purely ________ in nature and can vary from a few ________ to ________.
- resistive, ohms, megohms
- capacitive, microfarads, farads
- inductive, millihenrys, henrys
- None of the above
37. The ________ the source resistance and/or ________ the load resistance, the less the overall gain of an amplifier.
- smaller, smaller
- smaller, larger
- larger, smaller
- larger, larger
38. A Darlington pair provides beta ________ for ________ input resistance.
- multiplication, decreased
- multiplication, increased
- division, decreased
39. A Darlington pair amplifier has
- high input impedance and high voltage gain.
- low input impedance and low voltage gain.
- a voltage gain of about 1 and a low input impedance.
- a low voltage gain and a high input impedance.
40. A common-collector amplifier has high input impedance, good current gain, and a voltage gain of 1.
- TRUE
- FALSE