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Subel. E
6 questions
Subelement E

Power Sources:

Section 40

Power Supplies-2:

What is the function of a crowbar circuit?

  • It provides a voltage reference for the voltage regulator.
  • Correct Answer
    It prevents an overvoltage condition from damaging circuitry by shorting the power supply output.
  • It provides a voltage reference for the chopper circuit.
  • It provides a feedback signal for the chopper circuit.
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Which of the following is not one of the main advantages of a switching power supply?

  • Works with a wide range of input voltages.
  • Can work with direct current input.
  • Correct Answer
    No RFI problems.
  • Lighter weight than linear power supplies.
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What is the configuration for a mains operated switching power supply with output regulation?

  • Input rectifier and filter, Inverter (chopper), output transformer, feedback loop to a chopper controller and inverter and output rectifier and filter to DC output.
  • Line, Inverter (chopper), input rectifier and filter, output transformer, output rectifier and filter to DC output.
  • Input rectifier and filter, output transformer, output rectifier and filter to DC output with feedback loop to the input followed by the chopper controller.
  • Correct Answer
    Input rectifier and filter, Inverter (chopper), output transformer, output rectifier and filter to DC output with feedback loop to a chopper controller and the inverter.
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Which of the following statements about switching power supplies is the most accurate?

  • Correct Answer
    Transformers use a ferrite core to reduce losses at high frequencies.
  • Transformers use a laminated steel core to reduce losses at high frequencies.
  • Lower switching frequencies provide better voltage regulation.
  • Higher switching frequencies are more difficult to filter.
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What are the input/output voltages of a "BUCK" switching power supply with a 50% duty cycle?

  • 120 volts in, 240 volts out.
  • 24 volts in, 36 volts out.
  • 12 volts in, 12 volts out.
  • Correct Answer
    10 volts in, 5 volts out.
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Which of the following statements about a switching mode power supply input current is correct?

  • Correct Answer
    It has high harmonic content and a low power factor.
  • It has low harmonic content and a low power factor.
  • It has high harmonic content and a high power factor.
  • It has low harmonic content and a high power factor.
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