BJIt Amplifiers Questions and Answers

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Showing 10 of 46 questions
Q31
For a common-emitter amplifier, the purpose of the emitter bypass capacitor is
  • A no purpose, since it is shorted out by RE.
  • B to reduce noise.
  • C to despike the supply voltage.
  • D to maximize amplifier gain.
Answer: Option D
Q32
For BJT amplifiers, the ________ gain typically ranges from a level just less than 1 to a level that may exceed 1000.
  • A voltage
  • B current
  • C impedance
  • D All of the above
Answer: Option B
Q33
The loaded voltage gain of an amplifier is always more than the no-load level.
  • A TRUE
  • B FALSE
Answer: Option B
Q34
What is the limit of the efficiency defined by = Po / Pi?
  • A Greater than 1
  • B Less than 1
  • C Always 1
  • D None of the above
Answer: Option B
Q35
Which of the following techniques can be used in the sinusoidal ac analysis of transistor networks?
  • A Small-signal
  • B Large-signal
  • C Small- or large-signal
  • D None of the above
Answer: Option C
Q36
The input impedance of a BJT amplifier is purely ________ in nature and can vary from a few ________ to ________.
  • A resistive, ohms, megohms
  • B capacitive, microfarads, farads
  • C inductive, millihenrys, henrys
  • D None of the above
Answer: Option A
Q37
The ________ the source resistance and/or ________ the load resistance, the less the overall gain of an amplifier.
  • A smaller, smaller
  • B smaller, larger
  • C larger, smaller
  • D larger, larger
Answer: Option C
Q38
A Darlington pair provides beta ________ for ________ input resistance.
  • A multiplication, decreased
  • B multiplication, increased
  • C division, decreased
Answer: Option B
Q39
A Darlington pair amplifier has
  • A high input impedance and high voltage gain.
  • B low input impedance and low voltage gain.
  • C a voltage gain of about 1 and a low input impedance.
  • D a low voltage gain and a high input impedance.
Answer: Option D
Q40
A common-collector amplifier has high input impedance, good current gain, and a voltage gain of 1.
  • A TRUE
  • B FALSE
Answer: Option A

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