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  • Question
  • In the series circuit shown in figure, for series resonance, the value of the coupling coefficient, K will be
    In the series circuit shown in figure, for series resonance, the value of the coupling coefficient,


  • Options
  • A. 0.25
  • B. 0.5
  • C. 0.1
  • D. 1

  • Correct Answer
  • 0.25 

    Explanation
    Mutual inductance wm = ?k L1L2

    m = k. 2. 8j2 = 4k. j

    Z = 20 - j10 + j2 + j6 + 2.4kj - 2j + 8kj = 0 at resonance

    ⟹ -2 = -8k

    k = 1/4 ⟹ 0.25 .


    Networks Analysis and Synthesis problems


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    • 1. The impedance of an RC series circuit is 12 ? at f= 50 Hz. At f= 200 Hz, the impedance will be

    • Options
    • A. more than 12
    • B. less than 3
    • C. more than 3 ? but less than 12 ?
    • D. more than 12 ? but less than 24 ?
    • Discuss
    • 2. A capacitor stores 0.15C at 5 V. Its capacitance is

    • Options
    • A. 0.75 F
    • B. 0.75 ?F
    • C. 0.03 F
    • D. 0.03 ?F
    • Discuss
    • 3. Z(c) for the network shown in the figure is The value of C and R are, respectively

    • Options
    • A. 1/6 F and 4 ?
    • B. 2/9 F and 9/2 ?
    • C. 2/3 F and 1/2 ?
    • D. 1/2 F and 1 ?
    • Discuss
    • 4. C = (2) (energy)/V2

    • Options
    • A. True
    • B. False
    • Discuss
    • 5. In the circuit of figure the voltage across capacitor when switch is closed at t = ? is

    • Options
    • A. 0 V
    • B. 20 V
    • C. very large
    • D. 7.5 V
    • Discuss
    • 6. As compared to the number of network elements in Brune synthesis, the number of network elements Bott-and Duffin in realization is

    • Options
    • A. more
    • B. less
    • C. equal
    • D. any of the above
    • Discuss
    • 7. Two networks are cascaded through an ideal buffer. If td1 and td2 are delay times of network, the overall delay time is

    • Options
    • A. td1 + td2
    • B. t2d1 + t2d2
    • C. td1 + td2
    • D.
    • Discuss
    • 8. A capacitor is needed for an ac circuit of 230 V, 50 Hz the peak voltage rating of the capacitor should be

    • Options
    • A. 230 V
    • B. 0.5 x 230 V
    • C. 2 x 230V
    • D. 230/2V
    • Discuss
    • 9. For node 1 in figure, KCL equation is

    • Options
    • A.
    • B.
    • C.
    • D. none of the above
    • Discuss
    • 10. Which of the following is correct for a driving point functions?

    • Options
    • A. The real parts of all poles must be negative
    • B. The real parts of all poles and zeros must be negative
    • C. The real parts of all poles and zeros must be negative or zero
    • D. The real parts of all zeros must be negative
    • Discuss


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