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Subelement A
Principles
Section 8
Conduction
What is the term used to identify an AC voltage that would cause the same heating in a resistor as a corresponding value of DC voltage?
  • Cosine voltage.
  • Power factor.
  • Correct Answer
    Root mean square (RMS).
  • Average voltage.
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What happens to reactive power in a circuit that has both inductors and capacitors?
  • It is dissipated as heat in the circuit.
  • Correct Answer
    It alternates between magnetic and electric fields and is not dissipated.
  • It is dissipated as inductive and capacitive fields.
  • It is dissipated as kinetic energy within the circuit.
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Halving the cross-sectional area of a conductor will:
  • Not affect the resistance.
  • Quarter the resistance.
  • Correct Answer
    Double the resistance.
  • Halve the resistance.
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Which of the following groups is correct for listing common materials in order of descending conductivity?
  • Correct Answer
    Silver, copper, aluminum, iron, and lead.
  • Lead, iron, silver, aluminum, and copper.
  • Iron, silver, aluminum, copper, and silver.
  • Silver, aluminum, iron, lead, and copper.
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How do you compute true power (power dissipated in the circuit) in a circuit where AC voltage and current are out of phase?
  • Multiply RMS voltage times RMS current.
  • Subtract apparent power from the power factor.
  • Divide apparent power by the power factor.
  • Correct Answer
    Multiply apparent power times the power factor.
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Assuming a power source to have a fixed value of internal resistance, maximum power will be transferred to the load when:
  • The load impedance is greater than the source impedance.
  • Correct Answer
    The load impedance equals the internal impedance of the source.
  • The load impedance is less than the source impedance.
  • The fixed values of internal impedance are not relative to the power source.
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