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  • Question
  • What will happen when an inductor's magnetic field collapses?


  • Options
  • A. Current will double.
  • B. Voltage will be induced.
  • C. A new field will expand.
  • D. Counter emf will be high.

  • Correct Answer
  • Voltage will be induced. 


  • Inductors problems


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    • 1. When a coil collapses the induced circuit current will:

    • Options
    • A. be in the same direction
    • B. go to zero
    • C. aid counter emf buildup
    • D. be in the opposite direction
    • Discuss
    • 2. When a load is not connected to the secondary of a transformer:

    • Options
    • A. primary current is zero
    • B. primary current is inversely proportional to primary impedance
    • C. secondary voltage is zero
    • D. secondary voltage is proportional to primary impedance
    • Discuss
    • 3. With a square wave input, an RL differentiator circuit with an output across the inductor will produce what type of waveform?

    • Options
    • A. dc
    • B. short time-duration pulses
    • C. exponential-shaped pulses
    • D. only a phase shift
    • Discuss
    • 4. 

      What is the total inductance in the given circuit?


    • Options
    • A. 160 mH
    • B. 300 mH
    • C. 900 mH
    • D. 1700 mH
    • Discuss
    • 5. Current will cause a magnetic field in a conductor as follows:

    • Options
    • A. An ac current causes a fixed polarity magnetic field.
    • B. A dc current causes a fixed polarity magnetic field.
    • C. A dc current causes an alternating magnetic field.
    • D. An ac current causes a fixed polarity magnetic field and a dc current causes an alternating magnetic field.
    • Discuss
    • 6. A voltage is induced in a transformer secondary winding by the action of the:

    • Options
    • A. secondary magnetic field
    • B. primary turns ratio
    • C. primary magnetic field
    • D. secondary counter emf
    • Discuss
    • 7. Reactance in an inductive circuit will:

    • Options
    • A. increase with frequency
    • B. decrease with frequency
    • C. be independent from frequency
    • D. depend on the value of XC
    • Discuss
    • 8. What is the inductive reactance if the Q of a coil is 60, and the winding resistance is 5 Ω?

    • Options
    • A. 0.083 Ω
    • B. 12 Ω
    • C. 30 Ω
    • D. 300 Ω
    • Discuss
    • 9. You could decrease the time constant of an RL circuit by

    • Options
    • A. adding a resistor in parallel with the circuit resistance
    • B. adding an inductor in series with the circuit inductance
    • C. decreasing the amplitude of the input voltage
    • D. exchanging the position of the resistor and inductor in the circuit
    • Discuss
    • 10. A magnetic circuit breaker will open to protect equipment only when:

    • Options
    • A. voltage is exceeded
    • B. an open is in the equipment
    • C. the equipment is operating properly
    • D. current is exceeded
    • Discuss


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