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High-voltage power supplies can retain deadly voltages after they have been switched off and unplugged. This is because the filter capacitors retain their charge for some time. If you have any doubt about your ability to safely build or work with a power supply, leave it to a professional.
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Refer to the text in this chapter if necessary. A good score is at least 18 correct. Answers are in the back of the book. 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.
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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
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10. Suppose a transformer secondary provides 10-V rms ac to a voltage-doubler circuit. What is the 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. 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. 14. 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. 15. 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. 16. 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.
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