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Subelement E
Power Sources:
Section 39
Power Supplies-1:
Which of the following best describes a standard full wave rectifier power supply?
  • It uses a capacitor input filter to provide good voltage regulation.
  • It must only use a single diode rectifier.
  • Correct Answer
    The ripple frequency is twice the input frequency.
  • It must always use a center tapped transformer secondary.
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Which of the following statements concerning power supply filters is true?
  • A capacitor input has high output voltage, good voltage regulation, low rectifier peak currents and low transformer utilization factor.
  • A capacitor input has low output voltage, poor voltage regulation, high rectifier peak currents and low transformer utilization factor.
  • An Inductive input has poor voltage regulation, low transformer utilization factor, high rectifier peak currents and relative low output voltage.
  • Correct Answer
    An Inductive input has good voltage regulation, high transformer utilization factor, low rectifier peak currents and relatively low output voltage.
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What are the main advantages of using switcher type power supply?
  • Correct Answer
    Line voltage is directly rectified and filtered to produce a high dc voltage, components are much smaller and lighter weight, can provide much better efficiency.
  • The transformed voltage is directly rectified and filtered to produce a high dc voltage, components are much smaller and lighter weight and can provide much better efficiency.
  • They use laminated steel transformers which are more efficient.
  • Using a center tapped transformer secondary allows fewer rectifiers to be used.
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What are the disadvantages of using a switcher type power supply?
  • Increased complexity (more likelihood of a component failure), increased cost (many more parts) and tendency to create radiated AF.
  • Correct Answer
    Increased complexity (more likelihood of a component failure), increased cost (many more parts) and tendency to create radiated RF.
  • Decreased complexity (less likelihood of a component failure) and decreased cost (fewer parts and tendency to create radiated RF.
  • Decreased complexity (less likelihood of a component failure) and decreased cost (fewer parts and tendency to create radiated AF.
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Power supplies with inductive input filters have the following characteristics:
  • Poor voltage regulation with high peak rectifier currents.
  • Correct Answer
    Good voltage regulation with high transformer utilization factor.
  • Low transformer utilization factor with low rectifier peak currents.
  • High transformer utilization factor with high rectifier peak currents.
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Power supplies with capacitive input filters have the following characteristics:
  • Relatively high output voltage with low rectifier peak currents.
  • High transformer utilization factor with good voltage regulation.
  • Correct Answer
    Poor voltage regulation and high rectifier peak currents.
  • Good voltage regulation with high transformer utilization factor.
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