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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 .

    More questions

    • 1. In a conductor which of the following relations hold good?

    • Options
    • A. ? x D = r
    • B. ? . D = r
    • C. ? x D = 0
    • D. ? . D = 0
      • Discuss
    • 2. In a multiphase chopper, all choppers operate together.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. In a receiver, at higher frequencies

    • Options
    • A. tracking will be improved
    • B. tracking will be poor
    • C. selectivity will be poor
    • D. image frequency rejection will be poor
      • Discuss
    • 4. In which of these is reverse recovery time nearly zero?

    • Options
    • A. Zener diode
    • B. Tunnel diode
    • C. Schottky diode
    • D. PIN diode
      • Discuss
    • 5. The number of leads in a DIAC are

    • Options
    • A. 2
    • B. 3
    • C. 4
    • D. 6
      • Discuss
    • 6. A dc chopper V = 500 V feeds an electric fraction dc series motor. The chopping frequency is 400 Hz. The series inductance required to limit the maximum current swing to 10 A is

    • Options
    • A. 20 mH
    • B. about 31 mH
    • C. about 51 mH
    • D. about 92 mH
      • Discuss
    • 7. The capacitance of a capacitor is not affected by

    • Options
    • A. area of plates
    • B. thickness of plates
    • C. ?r
    • D. distance between plates
      • Discuss
    • 8. In a semi converter feeding a resistive load

    • Options
    • A. the waveshapes of output voltage and output current are exactly similar
    • B. the waveshapes of output voltage and output current can not be similar
    • C. the waveshapes of output voltage and output current are similar only for low values of firing angle
    • D. the waveshapes of output voltage and output current may be similar or dissimilar
      • Discuss
    • 9. The field pattern of a solenoid is similar to that of bar magnet.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. Match the following:

      List I (Logic family) List II (Characteristic of logic family)
      A. TTL 1. Maximum power Consumption
      B. ECL 2. Highest Packing Density
      C. NMOS 3. Least Power Consumption
      D. CMOS 4. Saturated Logic


    • Options
    • A. A-1, B-4, C-2, D-3
    • B. A-1, B-4, C-3, D-2
    • C. A-4, B-1, C-2, D-3
    • D. A-4, B-1, C-3, D-2
      • Discuss

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