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  • Question

  • 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

  • Correct Answer
  • both have infinite set of TE and TM modes 

    • Microwave Communication problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. 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
      • Discuss
    • 4. 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
    • 5. A microstrip line has ?r = 9. The normalised wavelength is about

    • Options
    • A. 10
    • B. 2
    • C. 1
    • D. 0.4
      • Discuss
    • 6. 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
    • 7. 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
    • 8. The attenuation characteristics of a loaded line is similar to that of

    • Options
    • A. low pass filter
    • B. high pass filter
    • C. band pass filter
    • D. band stop filter
      • Discuss
    • 9. In a microwave coaxial cable the inner conductor radius is a and inner radius of outside conductor is b. For TE11 mode the cut off wavelength is about

    • Options
    • A. a + b
    • B. p(a + b)
    • C. pa
    • D. pb
      • Discuss
    • 10. Radar is essentially an echo ranging system

    • Options
    • A. True
    • B. False
      • Discuss

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