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  • Question

  • Regardless of whether the transformer is step-up or step-down, power in the primary equals the power in the secondary if there is 100% efficiency.


  • Options
  • A. True
  • B. False

  • Correct Answer
  • True 

    • Transformers problems

    Search Results

    • 1. 

      In the given circuit, the secondary voltage is in phase with the primary voltage.


    • Options
    • A. True
    • B. False
      • Discuss
    • 2. When the resistance is greater than the capacitive reactance in a series RC circuit, the phase angle is ___.

    • Options
    • A. 0°
    • B. between 0° and 45°
    • C. between 45° and 90°
    • D. 45°
      • Discuss
    • 3. If the impedance equals 2 kΩ in a parallel RC circuit, the admittance equals ___.

    • Options
    • A. More information is needed in order to find the admittance.
    • B. 2 kS
    • C. 4 kS
    • D. 500 µS
      • Discuss
    • 4. 

      The true power in the given circuit equals ___.


    • Options
    • A. 48.48 mW
    • B. 296.93 mW
    • C. 280.64 mW
    • D. 96.98 mW
      • Discuss
    • 5. If a series RC circuit contains a 120 kΩ resistance and a 160 kΩ capacitive reactance, the impedance equals _____.

    • Options
    • A. 280 kΩ
    • B. 120 kΩ
    • C. 160 kΩ
    • D. 200 kΩ
      • Discuss
    • 6. The reflected load value that the source sees will always be larger than the load value itself.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. If the current drawn in the secondary of a transformer increases, the power in the primary should remain the same.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. The secondary voltages produced by a center-tapped transformer are equal in amplitude but 180° out of phase with respect to the center tap.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. An open secondary winding of a transformer will cause the primary current to be nearly zero.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. If voltage is stepped-up to the secondary, current will be stepped-down by the same amount.

    • Options
    • A. True
    • B. False
      • Discuss

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