Gibilisco - Introduction To Semiconductors

20 Questions | Total Attempts: 1419

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Semiconductors Quizzes & Trivia

Questions and Answers
  • 1. 
    The term semiconductor arises from
    • A. 

      Resistor-like properties of metal oxides.

    • B. 

      Variable conductive properties of some materials.

    • C. 

      The fact that electrons conduct better than holes.

    • D. 

      Insulating properties of silicon and GaAs.

  • 2. 
    Which of the following is not an advantage of semiconductor devices over vacuum tubes?
    • A. 

      Smaller size

    • B. 

      Lower working voltage

    • C. 

      Lighter weight

    • D. 

      Ability to withstand high voltage spikes

  • 3. 
    Of the following substances, which is the most commonly used semiconductor?
    • A. 

      Germanium

    • B. 

      Galena

    • C. 

      Silicon

    • D. 

      Copper

  • 4. 
    GaAs is
    • A. 

      A compound.

    • B. 

      An element.

    • C. 

      A mixture.

    • D. 

      A gas.

  • 5. 
    A disadvantage of MOS devices is the fact that
    • A. 

      The charge carriers move fast.

    • B. 

      The material does not react to ionizing radiation.

    • C. 

      They can be damaged by electrostatic discharges.

    • D. 

      They must always be used at high frequencies.

  • 6. 
    Selenium works especially well in
    • A. 

      Photocells.

    • B. 

      High-frequency detectors.

    • C. 

      RF power amplifiers.

    • D. 

      Voltage regulators.

  • 7. 
    Of the following, which material allows the lowest forward voltage drop in a diode?
    • A. 

      Selenium

    • B. 

      Silicon

    • C. 

      Copper

    • D. 

      Germanium

  • 8. 
    A CMOS integrated circuit
    • A. 

      Can only work at low frequencies.

    • B. 

      Requires very little power to function.

    • C. 

      Requires considerable power to function.

    • D. 

      Can only work at high frequencies.

  • 9. 
    The purpose of doping is to
    • A. 

      Make the charge carriers move faster.

    • B. 

      Cause holes to flow.

    • C. 

      Give a semiconductor material specific properties.

    • D. 

      Protect devices from damage in case of transients.

  • 10. 
    A semiconductor material is made into N type by
    • A. 

      Adding an acceptor impurity.

    • B. 

      Adding a donor impurity.

    • C. 

      Injecting protons.

    • D. 

      Taking neutrons away.

  • 11. 
    Which of the following does not result from adding an acceptor impurity?
    • A. 

      The material becomes P type.

    • B. 

      Current flows mainly in the form of holes.

    • C. 

      Most of the carriers have positive electric charge.

    • D. 

      The substance acquires an electron surplus.

  • 12. 
    In a P-type material, electrons are
    • A. 

      The majority carriers.

    • B. 

      The minority carriers.

    • C. 

      Positively charged.

    • D. 

      Entirely absent.

  • 13. 
    Holes move from
    • A. 

      Minus to plus.

    • B. 

      Plus to minus.

    • C. 

      P-type to N-type material.

    • D. 

      N-type to P-type material.

  • 14. 
    When a P-N junction does not conduct even though a voltage is applied, the junction is
    • A. 

      Reverse-biased at a voltage less than the avalanche voltage.

    • B. 

      Overdriven.

    • C. 

      Biased past the breaker voltage.

    • D. 

      In a state of avalanche effect.

  • 15. 
    Holes flow the opposite way from electrons because
    • A. 

      Charge carriers flow continuously.

    • B. 

      They have opposite electric charge.

    • C. 

      They have the same electric charge.

    • D. 

      Forget it! Holes flow in the same direction as electrons.

  • 16. 
    If an electron is considered to have a charge of −1 unit, then a hole can be considered to have
    • A. 

      A charge of −1 unit.

    • B. 

      No charge.

    • C. 

      A charge of +1 unit.

    • D. 

      A charge that depends on the semiconductor type.

  • 17. 
    When a P-N junction is forward-biased, conduction will not occur unless
    • A. 

      The applied voltage exceeds the forward breakover voltage.

    • B. 

      The applied voltage is less than the forward breakover voltage.

    • C. 

      The junction capacitance is high enough.

    • D. 

      The depletion region is wide enough.

  • 18. 
    If the reverse bias exceeds the avalanche voltage in a P-N junction,
    • A. 

      The junction will be destroyed.

    • B. 

      The junction will insulate; no current will flow.

    • C. 

      The junction will conduct current.

    • D. 

      The capacitance will become extremely low.

  • 19. 
    Avalanche voltage is routinely exceeded when a P-N junction acts as a
    • A. 

      Current rectifier.

    • B. 

      Variable resistor.

    • C. 

      Variable capacitor.

    • D. 

      Voltage regulator.

  • 20. 
    Which of the following does not affect the junction capacitance of a diode?
    • A. 

      The cross-sectional area of the P-N junction

    • B. 

      The width of the depletion region

    • C. 

      The phase of an applied ac signal

    • D. 

      The reverse-bias voltage

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