Electronics - Diode Applications

34 Questions | Total Attempts: 1135

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Electronics Quizzes & Trivia

It covers diode applications.


Questions and Answers
  • 1. 
    The average value of a half-wave rectified voltage with a peak value of 200V is
    • A. 

      63.7V

    • B. 

      127.3 V

    • C. 

      141 V

    • D. 

      0 V

  • 2. 
    When a 60Hz sinusoidal voltage is applied to the input of a half-wave rectifier, the output frequency is
    • A. 

      120 Hz

    • B. 

      30 Hz

    • C. 

      60 Hz

    • D. 

      0 Hz

  • 3. 
    The peak value of the input to the half-wave rectifier is 10V. The approximate peak value of the output is
    • A. 

      10 V

    • B. 

      3.18 V

    • C. 

      10.7 V

    • D. 

      9.3 V

  • 4. 
    The diode, in a half wave rectifier with a peak input of 10V, must be able to withstand a reverse voltage of
    • A. 

      10 V

    • B. 

      5 V

    • C. 

      20 V

    • D. 

      3.18 V

  • 5. 
    The average value of a full-wave rectified voltage with a peak value of 75V is
    • A. 

      53 V

    • B. 

      47.8 V

    • C. 

      37.5 V

    • D. 

      23.9 V

  • 6. 
    When a 60Hz sinusoidal voltage is applied to the input of a full-wave rectifier, the output frequency is
    • A. 

      120 Hz

    • B. 

      60 Hz

    • C. 

      240 Hz

    • D. 

      0 Hz

  • 7. 
    The total secondary voltage in a center-tapped full-wave rectifier is 125Vrms. Neglecting the diode drop, the rms output voltage is
    • A. 

      125 V

    • B. 

      177 V

    • C. 

      100 V

    • D. 

      62.5 V

  • 8. 
    When the peak output voltage is 100V, the PIV for each diode in a center-tapped full-wave rectifier is (neglecting the diode drop)
    • A. 

      100 V

    • B. 

      200 V

    • C. 

      141 V

    • D. 

      50 V

  • 9. 
    When the rms output voltage of a bridge full-wave rectifier is 20V, the peak inverse voltage across the diodes is (neglecting the diode drop)
    • A. 

      20 V

    • B. 

      40 V

    • C. 

      28.3 V

    • D. 

      56.6 V

  • 10. 
    The ideal dc output voltage of a capacitor-input filter is equal to
    • A. 

      The peak value of the rectified voltage

    • B. 

      The average value of the rectified voltage

    • C. 

      The rms value of the rectified voltage

    • D. 

      Twice the value of the rectified voltage

  • 11. 
    A certain power-supply filter produces an output with a ripple of 100mV peak-to-peak and a dc value of 20V. The ripple factor is
    • A. 

      0.05

    • B. 

      0.005

    • C. 

      0.00005

    • D. 

      0.02

  • 12. 
    A 60V peak full-wave rectified voltage is applied to a capacitor-input filter. If f = 120 Hz, RL=10 kΩ and C=10 µF, the ripple voltage is
    • A. 

      0.6 V

    • B. 

      6 mV

    • C. 

      5.0 V

    • D. 

      2.88 V

  • 13. 
    If the load resistance of a capacitor-filtered full-wave rectifier is reduced, the ripple voltage
    • A. 

      Increases

    • B. 

      Is not affected

    • C. 

      Decreases

    • D. 

      Has a different frequency

  • 14. 
    Line regulation is determined by
    • A. 

      Load current

    • B. 

      Zener current and load current

    • C. 

      Changes in load resistance

    • D. 

      Changes in zener current and load current

  • 15. 
    Load regulation is determined by
    • A. 

      Changes in load current and input voltage

    • B. 

      Changes in load current and output voltage

    • C. 

      Changes in load resistance and input voltage

    • D. 

      Changes in zener current and load current

  • 16. 
    A 10 V peak-to-peak sinusoidal voltage is applied across a silicon diode and series resistor. The maximum voltage across the diode is
    • A. 

      9.3 V

    • B. 

      5 V

    • C. 

      0.7 V

    • D. 

      10 V

    • E. 

      4.3 V

  • 17. 
    In the input voltage to a voltage tripler has an rms value of 12 V, the dc output voltage is approximately
    • A. 

      36 V

    • B. 

      50.9 V

    • C. 

      33.9 V

    • D. 

      32.4 V

  • 18. 
    If one of the diode in a bridge full-wave rectifier opens, the output is
    • A. 

      0 V

    • B. 

      A half-wave rectified voltage

    • C. 

      One-fourth the amplitude of the input voltage

    • D. 

      A 120 Hz voltage

  • 19. 
    • A. 

      The circuit is working properly

    • B. 

      The transformer secondary is shorted

    • C. 

      There is an open diode

    • D. 

      The filter capacitor is leaky

  • 20. 
    If one of the diode in a half-wave rectifier opens, the output is
    • A. 

      0 V

    • B. 

      A half-wave rectified voltage

    • C. 

      One-fourth the amplitude of the input voltage

    • D. 

      A 120 Hz voltage

  • 21. 
    If one of the diodes in a bridge rectifier shorts,
    • A. 

      The shorted diode may still function

    • B. 

      The transformer will be damaged

    • C. 

      The circuit will be half-wave rectifier

    • D. 

      Load current will be minimum

  • 22. 
    When the primary winding of the transformer in a power supply opens, output voltage is
    • A. 

      0 V

    • B. 

      A half-wave rectified voltage

    • C. 

      One-fourth the amplitude of the input voltage

    • D. 

      A 120 Hz voltage

  • 23. 
    In a half-wave rectifier, the current through the load is approximately
    • A. 

      The same as the input cycle

    • B. 

      50% of the input cycle

    • C. 

      One-fourth the amplitude of the input current

    • D. 

      A 60Hz current

  • 24. 
    • A. 

      A full-wave voltage occurs on each half of the input cycle and has the frequency of twice the input frequency.

    • B. 

      A half-wave voltage occurs once each input cycle and has the frequency equal to the half of the input frequency.

    • C. 

      A full-wave voltage occurs on each half of the input cycle and has the period twice the input period.

    • D. 

      A half-wave voltage occurs once each half of the input cycle and has the frequency equal to the half of the input frequency.

  • 25. 
    Which type of full-wave rectifier has the greater output voltage for the same input voltage and transformer turns ratio?
    • A. 

      Center-tapped full-wave rectifier

    • B. 

      Bridge full-wave rectifier

    • C. 

      Non-center-tapped full-wave rectifier

    • D. 

      All (a), (b) and (c) have the same output voltage

  • 26. 
    What is the average value of a full-wave rectified voltage with a peak value of 60V?
    • A. 

      19.1 V

    • B. 

      38.1 V

    • C. 

      84.8 V

    • D. 

      42.4 V

  • 27. 
    • A. 

      +1.4 V

    • B. 

      +0.7 V

    • C. 

      -1.4 V

    • D. 

      -0.7 V

  • 28. 
    Diode _____ add a dc level to an ac voltage.
    • A. 

      Limiters

    • B. 

      Clampers

    • C. 

      Voltage multipliers

    • D. 

      Rectifiers

  • 29. 
    Which of the following is true?
    • A. 

      The smaller the ripple voltage, the better the filter.

    • B. 

      The higher the ripple voltage, the better the filter.

    • C. 

      The quality of filter does not depend on the ripple voltage.

    • D. 

      High ripple voltage is caused by the power dissipated in the load resistor.

  • 30. 
    Diode _______ cut off voltage above or below specified levels.
    • A. 

      Limiters

    • B. 

      Clampers

    • C. 

      Voltage multipliers

    • D. 

      Rectifiers

  • 31. 
    A capacitor in a power supply used to reduced the variation of the output voltage from a rectifier.
    • A. 

      Filter

    • B. 

      Mica

    • C. 

      Ceramic

    • D. 

      Mylar

  • 32. 
    A circuit that converts an ac sinusoidal input voltage into a pulsating dc voltage with two output pulses occurring for each input cycle.
    • A. 

      Half-wave rectifier

    • B. 

      Full-wave rectifier

    • C. 

      Clipper

    • D. 

      Clamper

  • 33. 
    A circuit that converts an ac sinusoidal input voltage into a pulsating dc voltage with one output pulse occurring for each input cycle.
    • A. 

      Half-wave rectifier

    • B. 

      Full-wave rectifier

    • C. 

      Clipper

    • D. 

      Clamper

  • 34. 
    The maximum value of reverse voltage which occurs at the peak of the input cycle when the diode is reversed-biased.
    • A. 

      Rms voltage

    • B. 

      Peak voltage

    • C. 

      Average voltage

    • D. 

      Peak inverse voltage