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

  • The stator is the rotating assembly in a generator or motor.


  • Options
  • A. True
  • B. False

  • Correct Answer
  • False 

    Explanation
    The two main parts of a generator or motor can be described in either mechanical or electrical terms:

    Mechanical:

    Rotor: The rotating part of an electrical machine
    Stator: The stationary part of an electrical machine

    Electrical:

    Armature: The power-producing component of an electrical machine. In a generator, alternator, or dynamo the armature windings generate the electric current. The armature can be on either the rotor or the stator.
    Field: The magnetic field component of an electrical machine. The magnetic field of the dynamo or alternator can be provided by either electromagnets or permanent magnets mounted on either the rotor or the stator.

    • Three-Phase Systems in Power Applications problems

    Search Results

    • 1. In an ac circuit, power to the load peaks at the frequency at which the load impedance is the complex conjugate of the output impedance.

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    • A. True
    • B. False
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    • 2. Norton's theorem provides a method for the reduction of any ac circuit to an equivalent form consisting of an equivalent voltage source in series with an equivalent impedance.

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    • A. True
    • B. False
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    • 3. Like Thevenin's theorem, Norton's theorem provides a method of reducing a more complex circuit to a simpler, more manageable form for analysis.

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    • A. True
    • B. False
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    • 4. The superposition theorem is useful for circuit analysis only in ac circuits.

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    • A. True
    • B. False
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    • 5. A Thevenin ac equivalent circuit always consists of an equivalent ac voltage source and an equivalent capacitance.

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    • A. True
    • B. False
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    • 6. Power is measured in a three-phase load by using an ammeter.

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    • A. True
    • B. False
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    • 7. A simple three-phase generator consists of three conductive loops separated by 120°.

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    • A. True
    • B. False
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    • 8. A simple two-phase generator consists of two conductive loops separated by 90°, rotating in a magnetic field.

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    • A. True
    • B. False
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    • 9. Polyphase is characterized by two or more sinusoidal voltages, each having a different phase angle.

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    • A. True
    • B. False
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    • 10. In a Y-connected generator, there is a 120° difference between each line voltage and the nearest phase voltage.

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    • A. True
    • B. False
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