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  • Question
  • 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

  • Correct Answer
  • dot notation 


  • Inductors problems


    Search Results


    • 1. What is the inductive reactance?


    • Options
    • A. 5.2 Ω
    • B. 7.5 Ω
    • C. 1.3 kΩ
    • D. 7.5 kΩ
    • Discuss
    • 2. What is remanence?

    • Options
    • A. reactance
    • B. reluctance
    • C. retentitivity
    • D. resistance
    • Discuss
    • 3. 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
    • 4. 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
    • 5. 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
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. What type of device consists of a coil with a moveable iron core?

    • Options
    • A. solenoid
    • B. reed switch
    • C. relay
    • D. armature
    • Discuss
    • 10. 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


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