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Home ‣ Electronics and Communication Engineering ‣ Microwave Communication Comments
  • Question

  • The first and second subscripts in models of circular waveguides depict


  • Options
  • A. the number of full sine wave variations in circumference in direction and Bessel function variations in radial direction respectively
  • B. the Bessel function variations in radial direction and the number of full sine wave variations in circumference direction respectively
  • C. the Bessel function variations in circumference direction and number of full sine wave variations in radial direction respectively
  • D. none of the above

  • Correct Answer
  • the number of full sine wave variations in circumference in direction and Bessel function variations in radial direction respectively 

    • Microwave Communication problems

    Search Results

    • 1. 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
    • 2. A microstrip line has ?r = 9. The normalised wavelength is about

    • Options
    • A. 10
    • B. 2
    • C. 1
    • D. 0.4
      • Discuss
    • 3. The Q factor of a waveguide resonator is given by (?0 is resonant frequency, U is energy storage and WL is the power loss)

    • Options
    • A.
    • B.
    • C. Q = ?0UWL
    • D.
      • Discuss
    • 4. 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
    • 5. 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
    • 6. Which one of the following is true for EM wave propagation through rectangular waveguide of cross-section 2a x a

    • Options
    • A. critical wavelength for TE10 mode is the same as that for TE02 mode
    • B. critical wavelength for TE10 mode is one half of that for TE10 mode
    • C. critical wavelength for TE10 mode is the same as that for TM10 mode
    • D. critical wavelength for TE10 mode is double that for TE01mode
      • Discuss
    • 7. In which mode of circular waveguide does the attenuation continuously decrease as frequency is increased?

    • Options
    • A. TE01
    • B. TE11
    • C. TE05
    • D. TE21
      • Discuss
    • 8. As regards rectangular and circular waveguides

    • Options
    • A. both have infinite set of TE and TM modes
    • B. rectangular waveguide has infinite TE and TM modes but not the circular waveguide
    • C. circular waveguide has infinite TE and TM modes but not the rectangular waveguide
    • D. none of the above
      • Discuss
    • 9. Consider the following statements about instrument landing system of aircraft

      1. It ensures correct landing under conditions of low visibility.
      2. It consists of runaway localizer, glide path equipment and marker beacons.
      3. It is basically a blind landing system.
      Which of above statements are correct?

    • Options
    • A. All
    • B. 1 and 2 only
    • C. 1 and 3 only
    • D. 2 only
      • Discuss
    • 10. For air filled circular waveguides

    • Options
    • A. the attenuation due to imperfect conducting walls is negligible
    • B. the attenuation due to imperfect dielectric is negligible
    • C. both the attenuation i.e. due to imperfect conducting walls and due to imperfect dielectric are significant
    • D. the total attenuation is almost zero
      • Discuss

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