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

  • If in a Y-connected ac generator, each phase voltage has a magnitude of 90 VRMS, what is the magnitude of each line voltage?


  • Options
  • A. 0 V
  • B. 90 V
  • C. 156 V
  • D. 180 V

  • Correct Answer
  • 156 V 

    • More questions

    • 1. Two series resistors are connected to an ac source. If there are 7.5 V rms across one resistor and 4.2 V rms across the other, the peak source voltage is

    • Options
    • A. 16.54 V
    • B. 1.65 V
    • C. 10.60 V
    • D. 5.93 V
      • Discuss
    • 2. To derive 18 V and 12 V from a 24 V supply requires a voltage divider with three taps.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. The conductive loop on the rotor of a simple two-pole, single-phase generator rotates at a rate of 400 rps. The frequency of the induced output voltage is

    • Options
    • A. 40 Hz
    • B. 100 Hz
    • C. 400 Hz
    • D. indeterminable
      • Discuss
    • 4. A sine wave with a period of 4 ms is changing at a faster rate than a sine wave with a period of

    • Options
    • A. 0.0045 s
    • B. 2 ms
    • C. 1.5 ms
    • D. 3,000 µs
      • Discuss
    • 5. Referring to Problem 8, assume the input voltage is 15 V dc. What is the output voltage?

    • Options
    • A. 0 V
    • B. 15 V
    • C. 7.07 V
    • D. 10.6 V
      • Discuss
    • 6. A 12 V battery is connected across a series combination of 68 Ω, 47 Ω, 220 Ω, and 33 Ω. The amount of current is

    • Options
    • A. 326 mA
    • B. 16.3 mA
    • C. 32.6 mA
    • D. 163 mA
      • Discuss
    • 7. A practical voltage source has a nonzero internal resistance.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. When these numbers are added, (87 × 105) + (2.5 × 106), the result is

    • Options
    • A. 1.12 × 104
    • B. 11.2 × 105
    • C. 112 × 105
    • D. 1,120 × 106
      • Discuss
    • 9. Total current in an RL circuit always lags the source voltage.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. A 12 Ω resistor, a 40 µF capacitor, and an 8 mH coil are in series across an ac source. The resonant frequency is

    • Options
    • A. 28.1 Hz
    • B. 281 Hz
    • C. 2,810 Hz
    • D. 10 kHz
      • Discuss

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