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  • Question
  • 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

  • Correct Answer
  • the counter emf of the coil 


  • Inductors problems


    Search Results


    • 1. 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
    • 2. A practical inductor

    • Options
    • A. has inductance
    • B. has winding resistance
    • C. has winding capacitance
    • D. all of the above
    • Discuss
    • 3. 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
    • 4. 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
    • 5. 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
    • 6. 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
    • 7. On a schematic, dashed lines between two vertical coils usually mean the transformer has:

    • Options
    • A. an air core
    • B. an iron core
    • C. a nonmetallic core
    • D. a ferrite core
    • Discuss
    • 8. The polarity of induced voltage while a field is collapsing is:

    • Options
    • A. independent of the force creating it
    • B. opposite to the force creating it
    • C. identical to the force creating the field
    • D. present only if the force is stationary
    • Discuss
    • 9. What is the number of turns required in the secondary winding for a transformer when 120 volts is applied to a 2400-turn primary to produce 7.5 Vac at the secondary?

    • Options
    • A. 75 turns
    • B. 150 turns
    • C. 900 turns
    • D. 1920 turns
    • Discuss
    • 10. A loaded transformer will achieve mutual induction when:

    • Options
    • A. secondary current increase causes a primary current decrease
    • B. primary current is increased by an increase in secondary current
    • C. primary current is decreased by an increase in secondary current
    • D. secondary current decrease causes a primary current increase
    • Discuss


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