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Home ‣ Electrical Engineering ‣ Three-Phase Systems in Power Applications See What Others Are Saying!
  • Question

  • Compare the total copper cross sections in terms of current-carrying capacity for a single-phase and a three-phase 120 V system with effective load resistance of 15 Ω.


  • Options
  • A. single-phase 32 A; three-phase 16 A
  • B. single-phase 16 A; three-phase 8 A
  • C. single-phase 8 A; three-phase 4 A
  • D. single-phase 16 A; three-phase 0 A

  • Correct Answer
  • single-phase 16 A; three-phase 8 A 

    • More questions

    • 1. In an RC low-pass filter, the output voltage is taken across the resistor and the output lags the input voltage.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. A reflective load is a load as it appears to the source in the primary of a transformer.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. A transformer changes ac to dc.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. Series aiding is a term sometimes used to describe voltage sources of the same polarity in series.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. The number 4,500,000 can be expressed as

    • Options
    • A. 4,500 × 106
    • B. 4.5 × 106
    • C. 4.5 × 10-3
    • D. either 4,500 × 104 or 4.5 × 106
      • Discuss
    • 6. Two 1.5 V cells are connected series opposing across two 100 Ω resistors in series. Total current flow is

    • Options
    • A. 15 mA
    • B. 5 mA
    • C. 2 mA
    • D. 0 A
      • Discuss
    • 7. The branch current method uses

    • Options
    • A. Kirchhoff's voltage and current laws
    • B. Thevenin's theorem and Ohm's law
    • C. Kirchhoff's current law and Ohm's law
    • D. the superposition theorem and Thevenin's theorem
      • Discuss
    • 8. Some circuits require more than one voltage or current source.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. An ohmmeter is an instrument for measuring

    • Options
    • A. current
    • B. voltage
    • C. resistance
    • D. wattage
      • Discuss
    • 10. In a three-phase system, the voltages are separated by

    • Options
    • A. 45°
    • B. 90°
    • C. 120°
    • D. 180°
      • Discuss

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