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  • Question

  • In a transformer, what will happen to the primary current if the secondary magnetic field increases?


  • Options
  • A. Ip will increase.
  • B. Ip will be canceled.
  • C. Ip will remain the same.
  • D. Ip will decrease.

  • Correct Answer
  • Ip will increase. 

    • Inductors problems

    Search Results

    • 1. How long until the current is at a maximum?


    • Options
    • A. 0 µs
    • B. 5 µs
    • C. 15 µs
    • D. 25 µs
      • Discuss
    • 2. In a purely inductive circuit,

    • Options
    • A. current leads voltage by 90°
    • B. voltage lags current by 90°
    • C. voltage leads current by 90°
    • D. voltage and current are in phase (0°)
      • Discuss
    • 3. What is the phase angle between the source voltage and current, when a 100 mH inductor with a reactance of 6 kΩ, and a 1 kΩ resistor are in series with a source?

    • Options
    • A. 0.1 degrees
    • B. 9.0 degrees
    • C. 61.0 degrees
    • D. 81.0 degrees
      • Discuss
    • 4. Counter emf or induced voltage is:

    • Options
    • A. inversely proportional to the change in current
    • B. directly proportional to the change in time
    • C. directly proportional to the inductance in henrys
    • D. inversely proportional to the inductance in henrys
      • Discuss
    • 5. A winding of wire can be called

    • Options
    • A. an inductor
    • B. a coil
    • C. a choke
    • D. All of the above
      • Discuss
    • 6. 

      In the given circuit, what will the voltage be across R3 25 µs after the switch is moved to position 2?


    • Options
    • A. 2.88 V
    • B. 5.9 V
    • C. 8.34 V
    • D. 14 V
      • Discuss
    • 7. What is the current rise after 2 time constants if Vs = 12 V dc, R = 60 Ω, and the inductor is rated at 24 mH?

    • Options
    • A. 79.9 mA
    • B. 126.4 mA
    • C. 173.0 mA
    • D. 198.6 mA
      • Discuss
    • 8. The electrical energy consumed by a coil is stored in the form of:

    • Options
    • A. an electrical field
    • B. a force field
    • C. an electrostatic field
    • D. a magnetic field
      • Discuss
    • 9. When the transformer secondary is not loaded:

    • Options
    • A. secondary voltage increases
    • B. no secondary current flows
    • C. no secondary voltage is present
    • D. secondary current increases
      • Discuss
    • 10. The output phase for a transformer is:

    • Options
    • A. in phase with the input
    • B. out of phase with the input
    • C. dependent on the direction of the primary and secondary windings
    • D. dependent on the frequency of the primary source
      • Discuss

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