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  • Question
  • 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

  • Correct Answer
  • 300 Ω 


  • Inductors problems


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    • 1. 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
    • 2. 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
    • 3. 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.
    • Discuss
    • 4. 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
    • 5. 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
    • 6. 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
    • 7. 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
    • 8. When a magnet enters a coil and a voltage is induced, the process is known as:

    • Options
    • A. an alternation
    • B. self-inductance
    • C. counter emf
    • D. flux linkage
    • Discuss
    • 9. Electromagnetism is the:

    • Options
    • A. magnetic field caused by a permanent magnet
    • B. action between a permanent and an artificial magnet
    • C. magnetic field action with a current-carrying wire
    • D. current in the coil
    • Discuss
    • 10. What is remanence?

    • Options
    • A. reactance
    • B. reluctance
    • C. retentitivity
    • D. resistance
    • Discuss


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