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G7A07

PRACTICAL CIRCUITS · - Power supplies; schematic symbols

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What is the output waveform of an unfiltered full-wave rectifier connected to a resistive load?

  1. AA series of DC pulses at twice the frequency of the AC input
  2. BA series of DC pulses at the same frequency as the AC input
  3. CA sine wave at half the frequency of the AC input
  4. DA steady DC voltage
Why A full-wave rectifier conducts on both halves of the AC cycle, flipping the negative half up so it becomes positive. That produces one output hump for each half cycle of the input, so with a resistive load and no filter capacitor you get DC pulses arriving at twice the input frequency. From a 60 Hz line, the ripple appears at 120 Hz.
Watch out Pulses at the same frequency as the input describe a half-wave rectifier, which throws away one half of each cycle. A steady DC voltage only appears after a filter capacitor smooths the pulses.
Full wave uses both halves: 60 Hz in, 120 Hz ripple out. Half wave keeps 60 Hz.
HamSandwich explanation, first draft. The question and answers are the NCVEC text.
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The rest of G7A

  1. G7A01 What is the function of a power supply bleeder resistor?
  2. G7A02 Which of the following components are used in a power supply filter network?
  3. G7A03 Which type of rectifier circuit uses two diodes and a center-tapped transformer?
  4. G7A04 What is characteristic of a half-wave rectifier in a power supply?
  5. G7A05 What portion of the AC cycle is converted to DC by a half-wave rectifier?
  6. G7A06 What portion of the AC cycle is converted to DC by a full-wave rectifier?
  7. G7A07 What is the output waveform of an unfiltered full-wave rectifier connected to a resistive load?
  8. G7A08 Which of the following is characteristic of a switchmode power supply as compared to a linear power supply?
  9. G7A09 Which symbol in figure G7-1 represents a field effect transistor?
  10. G7A10 Which symbol in figure G7-1 represents a Zener diode?
  11. G7A11 Which symbol in figure G7-1 represents an NPN junction transistor?
  12. G7A12 Which symbol in Figure G7-1 represents a solid core transformer?
  13. G7A13 Which symbol in Figure G7-1 represents a tapped inductor?
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