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

  • The symbol hfe is the same as:


  • Options
  • A. The symbol hfe is the same as: hi-fi
  • B. The symbol hfe is the same as: hi-fi
  • C. hi-fi
  • D. The symbol hfe is the same as: hi-fi

  • Correct Answer
  •  

    • Bipolar Junction Transistors (BJT) problems

    Search Results

    • 1. Most of the electrons in the base of an NPN transistor flow:

    • Options
    • A. out of the base lead
    • B. into the collector
    • C. into the emitter
    • D. into the base supply
      • Discuss
    • 2. A current ratio of IC/IE is usually less than one and is called:

    • Options
    • A. beta
    • B. theta
    • C. alpha
    • D. omega
      • Discuss
    • 3. Three different Q points are shown on a dc load line. The upper Q point represents the:

    • Options
    • A. minimum current gain
    • B. intermediate current gain
    • C. maximum current gain
    • D. cutoff point
      • Discuss
    • 4. With the positive probe on an NPN base, an ohmmeter reading between the other transistor terminals should be:

    • Options
    • A. open
    • B. infinite
    • C. low resistance
    • D. high resistance
      • Discuss
    • 5. 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
    • 6. The C-B configuration is used to provide which type of gain?

    • Options
    • A. voltage
    • B. current
    • C. resistance
    • D. power
      • Discuss
    • 7. A transistor may be used as a switching device or as a:

    • Options
    • A. fixed resistor
    • B. tuning device
    • C. rectifier
    • D. variable resistor
      • Discuss
    • 8. If a transistor operates at the middle of the dc load line, a decrease in the current gain will move the Q point:

    • Options
    • A. off the load line
    • B. nowhere
    • C. up
    • D. down
      • Discuss
    • 9. If VCC = +18 V, voltage-divider resistor R1 is 4.7 kΩ, and R2 is 1500Ω, what is the base bias voltage?

    • Options
    • A. 8.70 V
    • B. 4.35 V
    • C. 2.90 V
    • D. 0.7 V
      • Discuss
    • 10. What is the collector current for a C-E configuration with a beta of 100 and a base current of 30 µA?

    • Options
    • A. 30 µA
    • B. .3 µA
    • C. 3 mA
    • D. 3 MA
      • Discuss

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