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

  • Radar is essentially an echo ranging system


  • Options
  • A. True
  • B. False

  • Correct Answer
  • True 

    • Microwave Communication problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. 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
    • 6. A directional coupler is used to determine

    • Options
    • A. rv
    • B. rv and VSWR
    • C. L and C
    • D. wave velocity
      • Discuss
    • 7. A TR (transmitter receiver) tube has

    • Options
    • A. low loss for low power signals and high
    • B. high loss for low power signals and low loss for high level signal
    • C. low loss for both low level and high level signals
    • D. high loss for both low level and high level signals
      • Discuss
    • 8. Assertion (A): In TE10 mode the cutoff frequency of rectangular waveguide is where a is the broad dimension and c is velocity of light.

      Reason (R): TE10 mode is the dominant mode in rectangular waveguide.


    • 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
    • 9. Which mode has the minimum cutoff frequency in rectangular wave guides?

    • Options
    • A. TE11
    • B. TE10
    • C. TE01
    • D. TE20
      • Discuss
    • 10. The radiation resistance of a doublet antenna of length dl is proportional to

    • Options
    • A. ? l
    • B. (? l)2
    • C. (? l)3
    • D. (? l)05
      • Discuss

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