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Transformers problems

  • 1. If voltage is stepped-up to the secondary, current will be stepped-down by the same amount.

  • Options
  • A. True
  • B. False
    • Discuss
  • 2. A transformer that has 700 turns in the primary and 35 turns in the secondary has a turns ratio of 20:1.

  • Options
  • A. True
  • B. False
    • Discuss
  • 3. Electronics Transformers: In the given ci

    In the given circuit, Maximum power is being transferred to the load.


  • Options
  • A. True
  • B. False
    • Discuss
  • 4. For mutual inductance to occur, the two coils must be at right angles to each other.

  • Options
  • A. True
  • B. False
    • Discuss
  • 5. A transformer turns ratio of ________ will be needed to match an output impedance of 5 kΩ to an 8 Ω speaker.

  • Options
  • A. 5:1
  • B. 8:1
  • C. 25:1
  • D. 625:1
    • Discuss
  • 6. ___ is the concept of one coil inducing a voltage into another coil.

  • Options
  • A. Electrical isolation
  • B. Self-inductance
  • C. Mutual inductance
  • D. Coefficient of coupling
    • Discuss
  • 7. Electronics Transformers: The secondary c

    The secondary current is _____ in the given circuit.


  • Options
  • A. 1.9 mA
  • B. 7.5 mA
  • C. 30 mA
  • D. 60 mA
    • Discuss
  • 8. A step-up transformer will ___ to the secondary.

  • Options
  • A. increase the current
  • B. increase the voltage
  • C. increase the power
  • D. decrease the voltage
    • Discuss
  • 9. ___ occurs in a transformer when some of the primary flux lines pass through the air instead of the core.

  • Options
  • A. Hysteresis loss
  • B. Magnetic flux leakage
  • C. Winding resistance
  • D. Winding capacitance
    • Discuss
  • 10. Making the load resistance appear the same as the source's internal resistance is called _____.

  • Options
  • A. maximum power transfer
  • B. reflected resistance
  • C. impedance matching
  • D. reflected load
    • Discuss

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