BJIt Amplifiers Questions and Answers

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Showing 10 of 46 questions
Q21
When the bypass capacitor is removed from a common-emitter amplifier, the voltage gain
  • A increases.
  • B decreases.
  • C has very little effect.
Answer: Option B
Q22
In a common-base amplifier, the input signal is connected to the
  • A base.
  • B collector.
  • C emitter.
  • D output.
Answer: Option C
Q23
Which of the following is (are) true to achieve a good overall voltage gain for the circuit?
  • A The effect of Rs and RL must be considered as a product.
  • B The effect of Rs and RL must be considered as a product and evaluated individually.
  • C The effect of Rs and RL must be evaluated individually.
  • D None of the above
Answer: Option B
Q24
To analyze the common-emitter amplifier, what must be done to determine the dc equivalent circuit?
  • A leave circuit unchanged
  • B replace coupling and bypass capacitors with opens
  • C replace coupling and bypass capacitors with shorts
  • D replace VCC with ground
Answer: Option B
Q25
For the common-emitter amplifier ac equivalent circuit, all capacitors are
  • A effectively shorts.
  • B effectively open circuits.
  • C not connected to ground.
  • D connected to ground.
Answer: Option A
Q26
Which of the following define(s) the conversion efficiency?
  • A Ac power to the load/ac input power
  • B Ac power to the load/dc power supplied
  • C Dc output power/ac input power
  • D All of the above
Answer: Option B
Q27
Which of the following should be done to obtain the ac equivalent of a network?
  • A Set all dc sources to zero
  • B Replace all capacitors by a short-circuit equivalent.
  • C Remove all elements bypassed by the short-circuit equivalent.
  • D All of the above
Answer: Option D
Q28
For the collector dc feedback configuration, there is a ________ phase shift between the input and output signals.
  • A 0º
  • B 45º
  • C 90º
  • D 180º
Answer: Option D
Q29
The total gain of a multistage amplifier is the ________.
  • A sum of individual voltage gains
  • B sum of dB voltage gains
Answer: Option B
Q30
Which of the following configurations has an output impedance Zo equal to RC?
  • A Fixed-bias common-emitter
  • B Common-emitter voltage-divider with bypass capacitor
  • C Common-emitter voltage-divider without bypass capacitor
  • D All of the above
Answer: Option D

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