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Subelement A
Principles
Section 5
Semi-conductors
What are the two most commonly-used specifications for a junction diode?
  • Maximum forward current and capacitance.
  • Maximum reverse current and PIV (peak inverse voltage).
  • Maximum reverse current and capacitance.
  • Correct Answer
    Maximum forward current and PIV (peak inverse voltage).
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What limits the maximum forward current in a junction diode?
  • The peak inverse voltage (PIV).
  • Correct Answer
    The junction temperature.
  • The forward voltage.
  • The back EMF.
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MOSFETs are manufactured with THIS protective device built into their gate to protect the device from static charges and excessive voltages:
  • Schottky diode.
  • Metal oxide varistor (MOV).
  • Correct Answer
    Zener diode.
  • Tunnel diode.
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What are the two basic types of junction field-effect transistors?
  • Correct Answer
    N-channel and P-channel.
  • High power and low power.
  • MOSFET and GaAsFET.
  • Silicon FET and germanium FET.
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A common emitter amplifier has:
  • Lower input impedance than a common base.
  • Correct Answer
    More voltage gain than a common collector.
  • Less current gain than a common base.
  • Less voltage gain than a common collector.
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How does the input impedance of a field-effect transistor compare with that of a bipolar transistor?
  • Correct Answer
    An FET has high input impedance; a bipolar transistor has low input impedance.
  • One cannot compare input impedance without first knowing the supply voltage.
  • An FET has low input impedance; a bipolar transistor has high input impedance.
  • The input impedance of FETs and bipolar transistors is the same.
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