MCQ Set 1 - Transistor Fundamentals

31 Questions | Total Attempts: 1699

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MCQ Set 1 - Transistor Fundamentals

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Questions and Answers
  • 1. 
    The current gain of a transistor is defined as the ratio of the collector current to the
    • A. 

      Base current

    • B. 

      Emitter current

    • C. 

      Supply current

    • D. 

      Collector current

  • 2. 
    The graph of current gain versus collector current indicates that the current gain
    • A. 

      Is constant

    • B. 

      Varies slightly

    • C. 

      Varies significantly

    • D. 

      Equals the collector current divided by the base current

  • 3. 
    When the collector current increases, what does the current gain do?
    • A. 

      Decreases

    • B. 

      Stays the same

    • C. 

      Increases

    • D. 

      Any of the above

  • 4. 
    As the temperature increases, the current gain
    • A. 

      Decreases

    • B. 

      Remains the same

    • C. 

      Increases

    • D. 

      Can be any of the above

  • 5. 
    When the base resistor increases, the collector voltage will probably
    • A. 

      Decrease

    • B. 

      Stay the same

    • C. 

      Increase

    • D. 

      Do all of the above

  • 6. 
    If the base resistor is very small, the transistor will operate in the
    • A. 

      Cutoff region

    • B. 

      Active region

    • C. 

      Saturation region

    • D. 

      Do all of the above

  • 7. 
    Ignoring the bulk resistance of the collector diode, the collector-emitter saturation voltage is
    • A. 

      0V

    • B. 

      A few tenths of a volt

    • C. 

      1V

    • D. 

      Supply voltage

  • 8. 
    Three different Q points are shown on a load line. The upper Q point represents the
    • A. 

      Minimum current gain

    • B. 

      Intermediate current gain

    • C. 

      Maximum current gain

    • D. 

      Cutoff point

  • 9. 
    If a transistor operates at the middle of the load line, a decrease in the base resistance will move the Q point
    • A. 

      Down

    • B. 

      Up

    • C. 

      Nowhere

    • D. 

      Off the load line

  • 10. 
    If the base supply voltage increase, the Q point moves
    • A. 

      Down

    • B. 

      Up

    • C. 

      Nowhere

    • D. 

      Off the load line

  • 11. 
    Suppose the base resistor is open. The Q point will be
    • A. 

      In the middle of the load line

    • B. 

      At the upper end of the load line

    • C. 

      At the lower end of the load line

    • D. 

      Off the load line

  • 12. 
    If the base supply voltage is disconnected, the collector-emitter voltage will equal
    • A. 

      0V

    • B. 

      6V

    • C. 

      10.5V

    • D. 

      Collector supply voltage

  • 13. 
    If the base resistor has zero resistance, the transistor will probably be
    • A. 

      Saturated

    • B. 

      In cutoff

    • C. 

      Destroyed

    • D. 

      None of the above

  • 14. 
    If the collector resistor opens in a base-biased circuit, the load line will become
    • A. 

      Horizontal

    • B. 

      Vertical

    • C. 

      Useless

    • D. 

      Flat

  • 15. 
    The collector current is 1.5mA. If the current gain is 50, the base current is
    • A. 

      3uA

    • B. 

      30uA

    • C. 

      150uA

    • D. 

      3mA

  • 16. 
    The base current is 50uA. If the current gain is 100, the collector current is closest in value to
    • A. 

      50uA

    • B. 

      500uA

    • C. 

      2mA

    • D. 

      5mA

  • 17. 
    When the Q point moves along the load line, VCE decreases when the collector current
    • A. 

      Decreases

    • B. 

      Stays the same

    • C. 

      Increases

    • D. 

      Does none of the above

  • 18. 
    When there is no base current in a transistor switch, the output voltage from the transistor is
    • A. 

      Low

    • B. 

      High

    • C. 

      Unchanged

    • D. 

      Unknown

  • 19. 
    A circuit with a fixed emitter current is called
    • A. 

      Base bias

    • B. 

      Emitter bias

    • C. 

      Transistor bias

    • D. 

      Two-supply bias

  • 20. 
    The first step in analyzing emitter-based circuits is to find the
    • A. 

      Base current

    • B. 

      Emitter current

    • C. 

      Supply current

    • D. 

      Collector current

  • 21. 
    If the current gain is unknown in an emitter-biased circuit, you cannot calculate the
    • A. 

      Emitter voltage

    • B. 

      Emitter current

    • C. 

      Collector current

    • D. 

      Base current

  • 22. 
    If the emitter resistor is open, the collector voltage is
    • A. 

      Low

    • B. 

      High

    • C. 

      Unchanged

    • D. 

      Unknown

  • 23. 
    If the collector resistor is open, the collector voltage is
    • A. 

      Low

    • B. 

      High

    • C. 

      Unchanged

    • D. 

      Unknown

  • 24. 
    When the current gain increases from 50 to 300 in an emitter-biased circuit, the collector current
    • A. 

      Remains almost the same

    • B. 

      Decreases by a factor of 6

    • C. 

      Increases by a factor of 6

    • D. 

      Is zero

  • 25. 
    If the emitter resistance increases, the collector voltage
    • A. 

      Decreases

    • B. 

      Stays the same

    • C. 

      Increases

    • D. 

      Breaks down the transistor

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