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Home ‣ Electrical Engineering ‣ Magnetism and Electromagnetism Comments
  • Question

  • A relay is an electromagnetically controlled mechanical device in which electrical contacts are opened or closed by a magnetizing current.


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  • A. True
  • B. False

  • Correct Answer
  • True 

    • Magnetism and Electromagnetism problems

    Search Results

    • 1. The Thevenin equivalent voltage (VTH) is the short-circuit voltage between two terminals in a circuit.

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    • A. True
    • B. False
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    • 2. A practical current source has a finite internal resistance.

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    • A. True
    • B. False
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    • 3. An ideal voltage source has zero internal resistance.

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    • A. True
    • B. False
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    • 4. An ideal current source has zero internal resistance.

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    • A. True
    • B. False
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    • 5. Conversions between delta-type and wye-type circuit arrangements are useful in certain specialized applications.

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    • A. True
    • B. False
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    • 6. If a conductor is moved back and forth at a constant rate in a constant magnetic field, the voltage in the conductor will reverse polarity.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. Ampere-turn is the unit of magnetomotive force (mmf).

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. The tesla is the unit of magnetic flux.

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    • A. True
    • B. False
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    • 9. Materials with a low retentivity do not retain a magnetic field very well.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. Hysteresis is the number of lines of force per unit area in a magnetic field.

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    • A. True
    • B. False
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