Gibilisco - Power Supplies Quiz

20 Questions | Total Attempts: 3665

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Gibilisco - Power Supplies Quiz - Quiz

Is your take on electronics subject really good? Can you answer all these questions related to the book power supplies by Stan Gibilisco? If so, take this quiz and see for yourself. This book includes questions and answers related to alternating current (AC), power supplies, wires, cables, and transformers. This is the overall reading material for all the electronics and electrical engineering students. The below quiz contains some of the important questions from this book. So, if you want to learn about power supplies, check out the quiz.


Questions and Answers
  • 1. 
    The output of a rectifier circuit without a filter included is
    • A. 

      60 Hz ac.

    • B. 

      Smooth dc.

    • C. 

      Pulsating dc.

    • D. 

      120 Hz ac.

  • 2. 
    Which of the following components is not necessarily required in a power supply designed to produce 12-V dc output with 117-V rms ac input?
    • A. 

      The transformer

    • B. 

      The filter

    • C. 

      The rectifier

    • D. 

      All of the above components are required.

  • 3. 
    Of the following appliances, which would need the biggest transformer?
    • A. 

      A clock radio

    • B. 

      A television broadcast transmitter

    • C. 

      A shortwave radio receiver

    • D. 

      A home television set

  • 4. 
    An advantage of full-wave bridge rectification is the fact that
    • A. 

      It uses the whole transformer secondary for the entire ac input cycle.

    • B. 

      It costs less than other rectifier types.

    • C. 

      It cuts off half of the ac wave cycle.

    • D. 

      It never needs a filter.

  • 5. 
    In a power supply designed to provide high power at low voltage, the best rectifier circuit would probably be the
    • A. 

      Half-wave arrangement.

    • B. 

      Full-wave, center-tap arrangement.

    • C. 

      Quarter-wave arrangement.

    • D. 

      Voltage doubler arrangement.

  • 6. 
    The part of a power supply immediately preceding the regulator is
    • A. 

      The transformer.

    • B. 

      The rectifier.

    • C. 

      The filter.

    • D. 

      The ac input.

  • 7. 
    If a half-wave rectifier is used with 165-V pk ac input, the effective dc output voltage is
    • A. 

      Considerably less than 165 V.

    • B. 

      Slightly less than 165 V.

    • C. 

      Exactly 165 V.

    • D. 

      Slightly more than 165 V.

  • 8. 
    If a full-wave bridge circuit is used with a transformer whose secondary provides 50 V rms, the peak voltage that occurs across the diodes in the reverse direction is approximately
    • A. 

      50 V pk.

    • B. 

      70 V pk.

    • C. 

      100 V pk.

    • D. 

      140 V pk.

  • 9. 
    What is the principal disadvantage of a voltage-doubler power supply circuit?
    • A. 

      Excessive current

    • B. 

      Excessive voltage

    • C. 

      Insufficient rectification

    • D. 

      Poor regulation under heavy loads

  • 10. 
    Suppose a transformer secondary provides 10-V rms ac to a voltage-doubler circuit. What isthe approximate dc output voltage with no load?
    • A. 

      14 V

    • B. 

      20 V

    • C. 

      28 V

    • D. 

      36 V

  • 11. 
    The ripple frequency from a full-wave rectifier is
    • A. 

      Twice that from a half-wave circuit.

    • B. 

      The same as that from a half-wave circuit.

    • C. 

      Half that from a half-wave circuit.

    • D. 

      1⁄4 that from a half-wave circuit.

  • 12. 
    Which of the following would make the best filter for a power supply?
    • A. 

      A capacitor in series

    • B. 

      A choke in series

    • C. 

      A capacitor in series and a choke in parallel

    • D. 

      A capacitor in parallel and a choke in series

  • 13. 
    Voltage regulation can be accomplished by a Zener diode connected in
    • A. 

      Parallel with the filter output, forward-biased.

    • B. 

      Parallel with the filter output, reverse-biased.

    • C. 

      Series with the filter output, forward-biased.

    • D. 

      Series with the filter output, reverse-biased.

  • 14. 
    A current surge takes place when a power supply is first turned on because
    • A. 

      The transformer core is suddenly magnetized.

    • B. 

      The diodes suddenly start to conduct.

    • C. 

      The filter capacitor(s) must be initially charged.

    • D. 

      Arcing takes place in the power switch.

  • 15. 
    Transient suppression is of importance mainly because it minimizes the risk of
    • A. 

      Diode failure.

    • B. 

      Transformer imbalance.

    • C. 

      Filter capacitor overcharging.

    • D. 

      Poor voltage regulation.

  • 16. 
    Suppose you see a fuse with nothing but a straight wire inside. You can assume that this fuse
    • A. 

      Is a slow-blow type.

    • B. 

      Is a quick-break type.

    • C. 

      Has a low current rating.

    • D. 

      Has a high current rating.

  • 17. 
    In order to minimize the risk of diode destruction as a result of surge currents that can occur when a power supply is first switched on, which of the following techniques can be useful?
    • A. 

      Connecting multiple diodes in series, with low-value resistors across each diode

    • B. 

      Connecting multiple diodes in parallel, with low-value resistors in series with each diode

    • C. 

      Connecting multiple diodes in parallel, with low-value capacitors in series with each diode

    • D. 

      Connecting multiple diodes in series, with low-value chokes across each diode

  • 18. 
    To repair a damaged power supply with which you are not completely familiar, you should
    • A. 

      Install bleeder resistors before beginning your work.

    • B. 

      Remove the fuse before beginning your work.

    • C. 

      Leave it alone and have a professional work on it.

    • D. 

      Short out all the diodes before beginning your work.

  • 19. 
    If a fuse blows, and it is replaced with one having a lower current rating, there is a good chance that
    • A. 

      The power supply will be severely damaged.

    • B. 

      The diodes will not rectify.

    • C. 

      The fuse will blow out right away.

    • D. 

      Transient suppressors won’t work.

  • 20. 
    If you need exceptionally good ripple filtering for a power supply, which of the following alternatives will yield the best results?
    • A. 

      Connect several capacitors in parallel.

    • B. 

      Use a choke-input filter.

    • C. 

      Connect several chokes in series.

    • D. 

      Use two capacitor/choke filtering sections in cascade.

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