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  • Question

  • A utility pole transformer used to supply a residential customer with two phases uses:


  • Options
  • A. two phases on the primary
  • B. a center tap on the secondary
  • C. a separate ground for each phase
  • D. a small coefficient of coupling

  • Correct Answer
  • a center tap on the secondary 

    • Inductors problems

    Search Results

    • 1. Which two values are plotted on a B-H curve graph?

    • Options
    • A. reluctance and flux density
    • B. permeability and reluctance
    • C. magnetizing force and permeability
    • D. flux density and magnetizing force
      • Discuss
    • 2. Find IR and IL.


    • Options
    • A. IR = 50 mA, IL = 109 mA
    • B. IR = 150 mA, IL = 9 mA
    • C. IR = 50 mA, IL = 151 mA
    • D. IR = 150 mA, IL = 53 mA
      • Discuss
    • 3. What happens when moving expanding lines of force encounter a conductor?

    • Options
    • A. Current increases.
    • B. Voltage is induced.
    • C. Resistance is reduced.
    • D. Power is increased.
      • Discuss
    • 4. If 360 Vac is the output of a 300-turn secondary winding, what is the input voltage when the primary winding has 150 turns?

    • Options
    • A. 2.4 Vac
    • B. 150 Vac
    • C. 180 Vac
    • D. 720 Vac
      • Discuss
    • 5. A magnetic field has:

    • Options
    • A. polar fields
    • B. lines of force
    • C. magnetomotive force
    • D. lines of reluctance
      • Discuss
    • 6. A winding of wire can be called

    • Options
    • A. an inductor
    • B. a coil
    • C. a choke
    • D. All of the above
      • Discuss
    • 7. Counter emf or induced voltage is:

    • Options
    • A. inversely proportional to the change in current
    • B. directly proportional to the change in time
    • C. directly proportional to the inductance in henrys
    • D. inversely proportional to the inductance in henrys
      • Discuss
    • 8. What is the phase angle between the source voltage and current, when a 100 mH inductor with a reactance of 6 kΩ, and a 1 kΩ resistor are in series with a source?

    • Options
    • A. 0.1 degrees
    • B. 9.0 degrees
    • C. 61.0 degrees
    • D. 81.0 degrees
      • Discuss
    • 9. In a purely inductive circuit,

    • Options
    • A. current leads voltage by 90°
    • B. voltage lags current by 90°
    • C. voltage leads current by 90°
    • D. voltage and current are in phase (0°)
      • Discuss
    • 10. How long until the current is at a maximum?


    • Options
    • A. 0 µs
    • B. 5 µs
    • C. 15 µs
    • D. 25 µs
      • Discuss

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