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  • Question

  • Fixed transformers have:


  • Options
  • A. a center-tapped secondary
  • B. multiple windings
  • C. turns ratios that cannot be changed
  • D. a multiple-tapped secondary

  • Correct Answer
  • turns ratios that cannot be changed 

    • Inductors problems

    Search Results

    • 1. If a Wheatstone bridge is balanced, a voltmeter in the center of the bridge will read:

    • Options
    • A. the same as the source voltage
    • B. half the source voltage
    • C. zero volts
    • D. twice the source voltage
      • Discuss
    • 2. What is the total resistance of a circuit when R1 (7 k Ω) is in series with a parallel combination of R2 (20 k Ω), R3 (36 k Ω), and R4 (45 k Ω)?

    • Options
    • A. 4 k Ω
    • B. 17 k Ω
    • C. 41 k Ω
    • D. 108 k Ω
      • Discuss
    • 3. If a series?parallel circuit has all 30-ohm resistors, what is the total resistance when R1 is in series with a parallel circuit consisting of R2 and R3?

    • Options
    • A. 10 ohms
    • B. 20 ohms
    • C. 45 ohms
    • D. 90 ohms
      • Discuss
    • 4. 

      If the load in the given circuit is open, what is the unloaded output voltage?


    • Options
    • A. 0 V
    • B. 4 V
    • C. 16 V
    • D. 20 V
      • Discuss
    • 5. What is the voltage to the load?


    • Options
    • A. 11.4 V
    • B. 12.4 V
    • C. 13.4 V
    • D. 15.4 V
      • Discuss
    • 6. Electricity may be generated by a wire:

    • Options
    • A. carrying current
    • B. wrapped as a coil
    • C. that has neutral domains
    • D. passing through a flux field
      • Discuss
    • 7. What is the permeability of machine steel?

    • Options
    • A. 1.1 x 10?4
    • B. 5.65 x 10?4
    • C. 6.9 x 10?3
    • D. 8.8 x 10?3
      • Discuss
    • 8. What is the approximate time for a complete decay of 400 mA of inductor current, when R = 10 ohms and L = 20 H?

    • Options
    • A. 10 seconds
    • B. 8 seconds
    • C. 4 seconds
    • D. 2 seconds
      • Discuss
    • 9. Electromagnetic induction is the generation of:

    • Options
    • A. electricity from magnetism
    • B. electricity from electricity
    • C. magnetism from electricity
    • D. magnetism from magnetism
      • Discuss
    • 10. 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

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