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  • Question

  • When an electromagnet reaches maximum strength, it is considered to be:


  • Options
  • A. in field condition
  • B. at saturation
  • C. inhibited
  • D. at field strength

  • Correct Answer
  • at saturation 

    • Inductors problems

    Search Results

    • 1. In a B-H curve, magnetizing force is equal to:

    • Options
    • A.
    • B. H = I × N
    • C. ampere-turns per weber
    • D. webers per square meter
      • Discuss
    • 2. As a generator armature passes the 270 degree point, the induced voltage is:

    • Options
    • A. at maximum negative
    • B. between maximum negative and zero
    • C. at maximum positive
    • D. between zero and maximum positive
      • Discuss
    • 3. 

      If the switch is moved to position 1 in the given circuit, how long will it take for the current to reach its maximum value?


    • Options
    • A. 72.5 µs
    • B. 532 µs
    • C. 610 µs
    • D. 833 µs
      • Discuss
    • 4. What is the maximum source current for a transformer rated at 10 kVA, 1000/500 60 Hz?

    • Options
    • A. 2 A
    • B. 5 A
    • C. 10 A
    • D. 20 A
      • Discuss
    • 5. What is the impedance of a 1 kHz series RL circuit when R and XL are both 1000 ohms?

    • Options
    • A. 500 ohms
    • B. 1000 ohms
    • C. 1414 ohms
    • D. 2000 ohms
      • Discuss
    • 6. The four factors determining inductance are the number of turns, coil length, coil area, and:

    • Options
    • A. permeability
    • B. reluctance
    • C. counter emf
    • D. coefficient of coupling
      • Discuss
    • 7. If you wanted to decrease the inductance of a coil, you might increase the:

    • Options
    • A. number of turns
    • B. permeability of the core
    • C. spacing between turns
    • D. area of the coil
      • Discuss
    • 8. A 24 V peak source is connected across a 900 µH inductor. If the frequency of the source is 22 kHz, what is the reactive power?

    • Options
    • A. 2.3 VAR
    • B. 4.6 VAR
    • C. 9.3 VAR
    • D. 0 VAR
      • Discuss
    • 9. An inductor is in series with a voltage source, an open switch, and a resistor. The instant the switch is closed, the inductor acts like

    • Options
    • A. a short
    • B. an open
    • C. a resistor
    • D. a voltage source
      • Discuss
    • 10. A henry value divided by a circuit resistive value provides the:

    • Options
    • A. counter emf value
    • B. induced voltage amplitude
    • C. rise or decay time constant
    • D. quality factor of the coil
      • Discuss

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