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  • Question
  • What is the coefficient of coupling for a transformer in which 4% of the total flux generated in the primary does not pass through the secondary?


  • Options
  • A. 0.4
  • B. 4
  • C. 9.6
  • D. 0.96

  • Correct Answer
  • 0.96 


  • Transformers problems


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    • 1. When the turns ratio of a transformer is 20 and the primary ac voltage is 12 V, the secondary voltage is

    • Options
    • A. 12 V
    • B. 120 V
    • C. 240 V
    • D. 2,400 V
    • Discuss
    • 2. A transformer has a 1:6 turns ratio and a secondary coil load resistance of 470 Ω. The load resistance as seen by the source is

    • Options
    • A. 1.3 Ω
    • B. 7.8 Ω
    • C. 78 Ω
    • D. 13 Ω
    • Discuss
    • 3. When a 6 V battery is connected across the primary of a transformer with a turns ratio of 8, the secondary voltage is

    • Options
    • A. 0 V
    • B. 6 V
    • C. 48 V
    • D. 0.75 V
    • Discuss
    • 4. If 25 W of power are applied to the primary of an ideal transformer with a turns ratio of 10, the power delivered to the secondary load is

    • Options
    • A. 25 W
    • B. 0 W
    • C. 250 W
    • D. 2.5 W
    • Discuss
    • 5. A transformer with a 110 V primary has a 15:1 turns ratio. The load resistance, RL, is 120 Ω. What is the approximate voltage across the load?

    • Options
    • A. 7.3 V
    • B. 73 V
    • C. 88 V
    • D. 880 V
    • Discuss
    • 6. In a parallel RL circuit, there are 3 A rms in the resistive branch and 3 A rms in the inductive branch. The total rms current is

    • Options
    • A. 6 A
    • B. 424 mA
    • C. 4.24 A
    • D. 42.4 A
    • Discuss
    • 7. Referring to Problem 23, the reactive power is

    • Options
    • A. 10 mVAR
    • B. 100 mVAR
    • C. 6.76 mVAR
    • D. 148 mVAR
    • Discuss
    • 8. When the frequency is decreased, the impedance of a parallel RL circuit

    • Options
    • A. increases
    • B. decreases
    • C. remains constant
    • D. is not a factor
    • Discuss
    • 9. To increase the current in a series RL circuit, the frequency

    • Options
    • A. should be increased
    • B. should be decreased
    • C. should be constant
    • D. cannot be determined without values
    • Discuss
    • 10. A 1.5 kΩ resistor and a coil with a 2.2 kΩ inductive reactance are in series across an 18 V ac source. The power factor is

    • Options
    • A. 564
    • B. 0.564
    • C. 6.76
    • D. 55.7
    • Discuss


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