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

  • In a transistor, collector current is controlled by:


  • Options
  • A. collector voltage
  • B. base current
  • C. collector resistance
  • D. all of the above

  • Correct Answer
  • base current 

    • Bipolar Junction Transistors (BJT) problems

    Search Results

    • 1. If a 2 mV signal produces a 2 V output, what is the voltage gain?

    • Options
    • A. 0.001
    • B. 0.004
    • C. 100
    • D. 1000
      • Discuss
    • 2. Often a common-collector will be the last stage before the load; the main function(s) of this stage is to:

    • Options
    • A. provide voltage gain
    • B. provide phase inversion
    • C. provide a high-frequency path to improve the frequency response
    • D. buffer the voltage amplifiers from the low-resistance load and provide impedance matching for maximum power transfer
      • Discuss
    • 3. What is the current gain for a common-base configuration where IE = 4.2 mA and IC = 4.0 mA?

    • Options
    • A. 16.80
    • B. 1.05
    • C. 0.20
    • D. 0.95
      • Discuss
    • 4. The ends of a load line drawn on a family of curves determine:

    • Options
    • A. saturation and cutoff
    • B. the operating point
    • C. the power curve
    • D. the amplification factor
      • Discuss
    • 5. When a silicon diode is forward biased, what is VBE for a C-E configuration?

    • Options
    • A. voltage-divider bias
    • B. 0.4 V
    • C. 0.7 V
    • D. emitter voltage
      • Discuss
    • 6. In a C-E configuration, an emitter resistor is used for:

    • Options
    • A. stabilization
    • B. ac signal bypass
    • C. collector bias
    • D. higher gain
      • Discuss
    • 7. Which is beta's current ratio?

    • Options
    • A. IC/IB
    • B. IC/IE
    • C. IB/IE
    • D. IE/IB
      • Discuss
    • 8. When transistors are used in digital circuits they usually operate in the:

    • Options
    • A. active region
    • B. breakdown region
    • C. saturation and cutoff regions
    • D. linear region
      • Discuss
    • 9. Total emitter current is:

    • Options
    • A. IE ? IC
    • B. IC + IE
    • C. IB + IC
    • D. IB ? IC
      • Discuss
    • 10. The input/output relationship of the common-collector and common-base amplifiers is:

    • Options
    • A. 270 degrees
    • B. 180 degrees
    • C. 90 degrees
    • D. 0 degrees
      • Discuss

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