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Home ‣ Electronics ‣ Diodes and Applications Comments
  • Question

  • Thermal shutdown occurs in an IC regulator if:


  • Options
  • A. power dissipation is too high
  • B. internal temperature is too high
  • C. current through the device is too high
  • D. load resistance increases

  • Correct Answer
  • internal temperature is too high 

    • Diodes and Applications problems

    Search Results

    • 1. The conduction band is closest to the valence band in

    • Options
    • A. semiconductors
    • B. conductors
    • C. insulators
    • D. The distance is the same for all of the above.
      • Discuss
    • 2. What is the current through the LED?


    • Options
    • A. 0 mA
    • B. 23 mA
    • C. 18 mA
    • D. 13 mA
      • Discuss
    • 3. The diode schematic arrow points to the:

    • Options
    • A. trivalent-doped material
    • B. positive axial lead
    • C. anode lead
    • D. cathode lead
      • Discuss
    • 4. In a power supply diagram, which block indicates a pulsating dc output?

    • Options
    • A. transformer
    • B. filter
    • C. rectifier
    • D. regulator
      • Discuss
    • 5. What is the current through the zener diode?


    • Options
    • A. 0 mA
    • B. 7 mA
    • C. 8.3 mA
    • D. 13 mA
      • Discuss
    • 6. A diode for which you can change the reverse bias, and thus vary the capacitance is called a

    • Options
    • A. varactor diode
    • B. tunnel diode
    • C. zener diode
    • D. switching diode
      • Discuss
    • 7. The mimicking of an open/closed switch by a diode allows alternating current to be:

    • Options
    • A. rectified
    • B. regulated
    • C. controlled
    • D. attenuated
      • Discuss
    • 8. The arrow in the schematic symbol of a diode points to

    • Options
    • A. the n-type material, which is called the anode
    • B. the n-type material, which is called the cathode
    • C. the p-type material, which is called the anode
    • D. the p-type material, which is called the cathode
      • Discuss
    • 9. With full-wave rectification, current through the load resistor must be:

    • Options
    • A. in opposite directions
    • B. to the external load
    • C. from the reverse biased diode
    • D. in the same direction
      • Discuss
    • 10. Which type of transformer is required to create a 180 degree input to a rectifier?

    • Options
    • A. center-tapped secondary
    • B. step-down secondary
    • C. stepped-up secondary
    • D. split winding primary
      • Discuss

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