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  • Question

  • If a capacitor C having selectivity factor Q is scaled down in all its dimensions by a factor K without any altering the dielectric material, the new capacitor will have capacitance and selectivity as


  • Options
  • A. C, If a capacitor C having selectivity factor Q is scaled down in all its dimensions by a factor K with
  • B. If a capacitor C having selectivity factor Q is scaled down in all its dimensions by a factor K with, Q
  • C. If a capacitor C having selectivity factor Q is scaled down in all its dimensions by a factor K with, If a capacitor C having selectivity factor Q is scaled down in all its dimensions by a factor K with
  • D. C, K

  • Correct Answer
  • , Q 

    Explanation
    Since the dimension of plates is scaled down by K, the area decreases by a factor of K2, the distance between plates decreases by a factor of K.

    Therefore, capacitance changes to If a capacitor C having selectivity factor Q is scaled down in all its dimensions by a factor K with.

    The selectivity will not be affected.

    More questions

    • 1. Which of the following noise becomes of great importance at high frequencies?

    • Options
    • A. Transit-time noise
    • B. Shot noise
    • C. Flicker noise
    • D. Agitation noise
      • Discuss
    • 2. A current source inverter has simple commutation circuit.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. In the given figure the line voltage after a number of reflections will be

    • Options
    • A. 30 V
    • B. -30 V
    • C. 10 V
    • D. -10 V
      • Discuss
    • 4. When the core of a saturable reactor is saturated, the inductance is high.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. The output wave of a cycloconverter consists of a number of segments derived from the input wave.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. For the control system in the given figure, the value of K for critical damping is

    • Options
    • A. 1
    • B. 5.125
    • C. 6.831
    • D. 10
      • Discuss
    • 7. As the firing of a thyristor is delayed, the output voltage of a controlled rectifier decreases.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. The circuit of the given figure realizes the function

    • Options
    • A. Y = (A + B) C + DE
    • B. Y = A + B + C + D + E
    • C. AB + C +DE
    • D. AB + C(D + E)
      • Discuss
    • 9. The two modes of operation of three phase bridge inverters are known as

    • Options
    • A. 60° mode and 120° mode
    • B. 90° mode and 120° mode
    • C. 120° mode and 180° mode
    • D. 120° mode and 240° mode
      • Discuss
    • 10. A first order system will never be able to give a __________ response

      1. band stop
      2. band pass
      3. all pass
      Choose the correct option

    • Options
    • A. 1, 2, 3 true
    • B. 1 and 3 true, 2 false
    • C. 1, 2 are true 3 is false
    • D. 1, 2 are false, 3 is true
      • Discuss

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