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  • Question
  • What type of device consists of a coil with a moveable iron core?


  • Options
  • A. solenoid
  • B. reed switch
  • C. relay
  • D. armature

  • Correct Answer
  • solenoid 


  • Inductors problems


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    • 1. Inductance is:

    • Options
    • A. directly proportional to the length of the coil
    • B. directly proportional to the number of turns on the coil
    • C. inversely proportional to the cross-sectional area of the coil
    • D. inversely proportional to the permeability
    • Discuss
    • 2. Which coil would be used as a step-up transformer primary if coil number 1 has 100 more turns than coil number 2?

    • Options
    • A. The coil windings must be the same.
    • B. coil 1
    • C. The coil ratio is too small.
    • D. coil 2
    • Discuss
    • 3. When a transformer secondary lead has been connected to a middle loop that is not an end connector, it is called a:

    • Options
    • A. multiple-tapped secondary
    • B. center-tapped secondary
    • C. multiple winding secondary
    • D. single winding secondary
    • Discuss
    • 4. Indication of transformer primary and secondary voltage relationships is accomplished by:

    • Options
    • A. color-coded wires
    • B. dot notation
    • C. black, rather than gray, casings
    • D. winding ratios
    • Discuss
    • 5. What is the inductive reactance?


    • Options
    • A. 5.2 Ω
    • B. 7.5 Ω
    • C. 1.3 kΩ
    • D. 7.5 kΩ
    • Discuss
    • 6. A value of "ten to the eighth power magnetic lines of force" is for the term:

    • Options
    • A. field
    • B. flux
    • C. coulomb
    • D. weber
    • Discuss
    • 7. As current travels within a conductor:

    • Options
    • A. the magnetic field aids the current
    • B. a magnetic field is developed around it
    • C. the wire tries to point north
    • D. an electrostatic field opposes the current
    • Discuss
    • 8. What is the total inductance assuming no mutual inductance?


    • Options
    • A. 0 mH
    • B. 0.69 mH
    • C. 12 mH
    • D. 24 mH
    • Discuss
    • 9. What is the impedance of a 1 kHz series RL circuit when R and XL are both 1000 ohms?

    • Options
    • A. 500 ohms
    • B. 1000 ohms
    • C. 1414 ohms
    • D. 2000 ohms
    • Discuss
    • 10. What is the maximum source current for a transformer rated at 10 kVA, 1000/500 60 Hz?

    • Options
    • A. 2 A
    • B. 5 A
    • C. 10 A
    • D. 20 A
    • Discuss


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