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  • Question

  • 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

  • Correct Answer
  • no secondary current flows 

    • Inductors problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. 

      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
    • 4. 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.
      • Discuss
    • 5. How long until the current is at a maximum?


    • Options
    • A. 0 µs
    • B. 5 µs
    • C. 15 µs
    • D. 25 µs
      • Discuss
    • 6. 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
    • 7. A practical inductor

    • Options
    • A. has inductance
    • B. has winding resistance
    • C. has winding capacitance
    • D. all of the above
      • Discuss
    • 8. Which transformer turns ratio is needed to match two 16-ohm parallel devices to an output of 22.2 ohms?

    • Options
    • A. 1.38:1
    • B. 1.67:1
    • C. 0.72:1
    • D. 0.60:1
      • Discuss
    • 9. When current in an inductor starts to change, it cannot react instantly due to:

    • Options
    • A. fixed coil resistance
    • B. eddy current generation
    • C. applied emf of the circuit
    • D. the counter emf of the coil
      • Discuss
    • 10. What is the phase angle of a 24 Vac parallel RL circuit when R = 45 ohms and XL = 1100 ohms?

    • Options
    • A. 0.001 degrees
    • B. 2.300 degrees
    • C. 87.600 degrees
    • D. 89.900 degrees
      • Discuss

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