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Home ‣ Electronics ‣ Bipolar Junction Transistors (BJT) Comments
  • Question

  • The input resistance, Rin of a common-collector amplifier, consists of ____________.


  • Options
  • A. Rin = RE × AC Current Gain
  • B. The input resistance, Rin of a common-collector amplifier, consists of ____________. Rin = RE × AC C
  • C. Rin = RE × ɑ
  • D. none of the above

  • Correct Answer
  • Rin = RE × AC Current Gain 

    • Bipolar Junction Transistors (BJT) problems

    Search Results

    • 1. The signal voltage gain of an amplifier, AV, is defined as __________.

    • Options
    • A.
    • B. AV = IC x RC
    • C.
    • D.
      • Discuss
    • 2. Base bias provides _________.

    • Options
    • A. a very stable Q point
    • B. a very unstable Q point
    • C. no current gain
    • D. zero current in the base and collector circuits
      • Discuss
    • 3. When troubleshooting a bipolar junction transistor using an ohmmeter, if one of the junctions reads low in both directions, the junction is shorted and the transistor is bad. If one of the junctions reads high in both directions, the junction is shorted and the transistor is good.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. In a BJT, the collector current is approximately equal to the base current.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. The voltage measured from the collector to the emitter is the sum of the base-emitter voltage plus the collector-base voltage.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. VCE approximately equals ________ when a transistor switch is in saturation.

    • Options
    • A. VC
    • B. VB
    • C. 0.3 V
    • D. 0.7 V
      • Discuss
    • 7. An emitter-follower has a voltage gain that is __________.

    • Options
    • A. much less than one
    • B. approximately equal to one
    • C. greater than one
    • D. zero
      • Discuss
    • 8. VCE approximately equals ________ when a transistor switch is cut off.

    • Options
    • A. VCC
    • B. VB
    • C. 0.2 V
    • D. 0.7 V
      • Discuss
    • 9. The phase difference between the input and output ac voltage signals of a common-emitter amplifier is __________.

    • Options
    • A. 0º
    • B. 90º
    • C. 180º
    • D. 360º
      • Discuss
    • 10. The input resistance of the base of an emitter-follower is usually _________.

    • Options
    • A. very low
    • B. very high
    • C. shorted to ground
    • D. open
      • Discuss

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