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  • Question

  • When does maximum power transfer happen from the source to the load?


  • Options
  • A. When the source resistance is greater than the load resistance
  • B. When the source resistance is less than the load resistance
  • C. When there is negligible source resistance
  • D. When the source resistance equals the load resistance

  • Correct Answer
  • When the source resistance equals the load resistance 

    • Transformers problems

    Search Results

    • 1. 

      What is the secondary voltage in the given circuit?


    • Options
    • A. 13.3 V rms in phase with the primary
    • B. 120 V rms in phase with the primary
    • C. 13.3 V rms out of phase with the primary
    • D. 120 V rms out of phase with the primary
      • Discuss
    • 2. A special transformer used to convert unbalanced signals to balanced signals is the

    • Options
    • A. balun
    • B. autotransformer
    • C. center-tapped transformer
    • D. step-across transformer
      • Discuss
    • 3. 

      What is the power dissipated in the primary of the transformer in the given circuit?


    • Options
    • A. 25 mW
    • B. 500 mW
    • C. 12.5 W
    • D. 62.5 W
      • Discuss
    • 4. Mutual induction is dependent on

    • Options
    • A. winding ratios
    • B. output polarities
    • C. dc voltage levels
    • D. current changes
      • Discuss
    • 5. 

      If the load doubled in value in the given circuit, what reflected resistance would the source see?


    • Options
    • A. 80 Ω
    • B. 400 Ω
    • C. 2 kΩ
    • D. 10 kΩ
      • Discuss
    • 6. If the primary power of an ideal transformer having a 2:1 voltage ratio is 100 W, the secondary power is

    • Options
    • A. 100 W
    • B. 50 W
    • C. 75 W
    • D. 200 W
      • Discuss
    • 7. A transformer is plugged into a 120 V rms source and has a primary current of 300 mA rms. The secondary is providing 18 V across a 10 Ω load. What is the efficiency of the transformer?

    • Options
    • A. 88%
    • B. 90%
    • C. 92%
    • D. 95%
      • Discuss
    • 8. The transformer turns ratio determines

    • Options
    • A. the ratio of primary and secondary voltages
    • B. the ratio of primary and secondary currents
    • C. the reflected impedance
    • D. all of the above
      • Discuss
    • 9. Often a common-collector will be the last stage before the load; the main function of this stage is to

    • Options
    • A. provide voltage gain
    • B. buffer the voltage amplifiers from the low-resistance load
    • C. provide phase inversion
    • D. provide a high-frequency path to improve the frequency response
      • Discuss
    • 10. A JFET

    • Options
    • A. is a current-controlled device
    • B. has a low input resistance
    • C. is a voltage-controlled device
    • D. is always forward-biased
      • Discuss

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