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Home ‣ Electrical Engineering ‣ Three-Phase Systems in Power Applications Comments
  • Question

  • The most common type of ac motor is the


  • Options
  • A. single-phase induction motor
  • B. two-phase induction motor
  • C. three-phase induction motor
  • D. two-phase squirrel-cage motor

  • Correct Answer
  • three-phase induction motor 

    • Three-Phase Systems in Power Applications problems

    Search Results

    • 1. In a certain three-wire Y-connected generator, the phase voltages are 2 kV. The magnitudes of the line voltages are

    • Options
    • A. 2,000 V
    • B. 6,000 V
    • C. 666 V
    • D. 3,464 V
      • Discuss
    • 2. In a △-connected generator, all of the phase voltages are

    • Options
    • A. zero
    • B. equal in magnitude
    • C. one-third of total
    • D. one-sixth of total
      • Discuss
    • 3. A three-phase △-connected generator is driving a balanced load such that each phase current is 12 A in magnitude. When I ?a = 12 ∠30° A, what are the polar expressions for the other phase currents?

    • Options
    • A. I ?b = 12 ∠150° A, I ?c = 12∠?90° A
    • B. I ?b = 12∠120° A, I ?c = 12∠30° A
    • C. I ?b = 12∠30° A, I ?c = 12∠120° A
    • D. I ?b = 12∠90° A, I ?c = 12∠90° A
      • Discuss
    • 4. 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
      • Discuss
    • 5. For the circuit shown, determine ZTH for the portion of the circuit external to RL.


    • Options
    • A. 66.7 ∠?33.7° kΩ
    • B. 6.67∠?333.7° kΩ
    • C. 14.4 ∠?56.3° kΩ
    • D. 1.44 ∠?33.7° kΩ
      • Discuss
    • 6. In a three-phase system, when the loads are perfectly balanced, the neutral current is

    • Options
    • A. zero
    • B. one-third of maximum
    • C. two-thirds of maximum
    • D. at maximum
      • Discuss
    • 7. In a △-connected source feeding a Y-connected load,

    • Options
    • A. each phase voltage equals the difference of the corresponding load voltages
    • B. each phase voltage equals the corresponding load voltage
    • C. each phase voltage is one-third the corresponding load voltage
    • D. each phase voltage is 60° out of phase with the corresponding load voltage
      • Discuss
    • 8. In a balanced three-phase load, each phase has

    • Options
    • A. an equal amount of power
    • B. one-third of total power
    • C. two-thirds of total power
    • D. a power consumption equal to IL
      • Discuss
    • 9. In a Y-connected circuit, the magnitude of each line current is

    • Options
    • A. one-third the phase current
    • B. three times the corresponding phase current
    • C. equal to the corresponding phase current
    • D. zero
      • Discuss
    • 10. Polyphase generators produce simultaneous multiple sinusoidal voltages that are separated by

    • Options
    • A. certain constant phase angles
    • B. certain constant frequencies
    • C. certain constant voltages
    • D. certain constant currents
      • Discuss

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