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  • Question

  • A parametric amplifier uses


  • Options
  • A. non linear resistance
  • B. non linear reactance
  • C. either (a) or (b)
  • D. neither (a) nor (b)

  • Correct Answer
  • non linear reactance 

    Explanation
    In a parametric amplifier the non-linear element is varactor diode or inductor.

    Microwave Communication problems

    Search Results

    • 1. As frequency increases, the transmission efficiency

    • Options
    • A. decreases
    • B. increases
    • C. is not affected
    • D. either (a) or (c)
      • Discuss
    • 2. A 75 ohm line is first short terminated and minima locations are noted. Then the short is replaced by resistive load and minima location are again noted. If minima location are not altered and VSWR is 3, the value of resistive load is

    • Options
    • A. 25 ?
    • B. 50 ?
    • C. 225 ?
    • D. 250 ?
      • Discuss
    • 3. A circular waveguide carries TE11 mode whole radial electric field is given by
      Er = E0j1(r) sin ? V/m
      where r is radial distance in cm from the axis
      The cut off wavelength is

    • Options
    • A. 10 cm
    • B. 3 p cm
    • C. 2 p cm
    • D. 8 cm
      • Discuss
    • 4. For a rectangular waveguide having width a and height b, the cutoff wavelength for TM11 mode is equal to

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 5. A circular polarizer converts a linearly polarized wave into a circularly polarised wave.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. Effect of loading of line is

    • Options
    • A. increase in Z0, a and ?
    • B. increase in Z0 and ? but decrease in a
    • C. decrease in Z0, a and ?
    • D. decrease in Z0 and ? but increase in a
      • Discuss
    • 7. If the repeller voltage in a klystron oscillator is increased the transit time of electron

    • Options
    • A. will be increased
    • B. will be decreased
    • C. will remain the same
    • D. either (a) or (b)
      • Discuss
    • 8. In a magnetron the magnetic flux density is of the order of

    • Options
    • A. 1 mWb/s
    • B. 1 Wb/m2
    • C. 106 m/s
    • D. 1012 m/s
      • Discuss
    • 9. Assertion (A): Bolometer is frequently used in microwave power measurement.

      Reason (R): In a bolometer the input microwave power causes a change in resistance.


    • Options
    • A. Both A and R are correct and R is correct explanation of A
    • B. Both A and R are correct but R is not correct explanation of A
    • C. A is correct but R is wrong
    • D. A is wrong but R is correct
      • Discuss
    • 10. The rotation of direction of E field of a linearly polarized wave passing through a magnetised ferric medium is called

    • Options
    • A. Lorentz rotation
    • B. Faraday rotation
    • C. Steinmitz rotation
    • D. Fleming's rotation
      • Discuss

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