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Home Electronics and Communication Engineering Microwave Communication Comments

  • Question
  • In a cable with ?r = 4, the wave velocity is


  • Options
  • A. 3 x 108 m/s
  • B. 0.75 x 108 m/s
  • C. 1.5 x 108 m/s
  • D. 108 m/s

  • Correct Answer
  • 1.5 x 108 m/s 


  • Microwave Communication problems


    Search Results


    • 1. The use of coaxial microwave line should be restricted to frequencies

    • Options
    • A. below cut off frequency of TE11 mode
    • B. above cut off frequency of TE11 mode
    • C. at frequencies much lower than cut off frequency of TE11 mode
    • D. at frequencies much higher than cut off frequency of TE11 mode
    • Discuss
    • 2. In a rectangular waveguide cutoff wavelength for TE10 mode is 8 cm. Then cutoff wavelength for TE20 mode is

    • Options
    • A. 8 cm
    • B. 6 cm
    • C. 4 cm
    • D. 2 cm
    • Discuss
    • 3. A waveguide twist is used to change the plane of polarization.

    • Options
    • A. True
    • B. False
    • Discuss
    • 4. In a rectangular waveguide

    • Options
    • A. the broad width is generally labelled 'a' and height 'b'
    • B. the broad width is generally labelled 'b' and height 'a'
    • C. any one of the dimensions may be labelled 'a' and the other 'b'
    • D. the length is labelled as 'a'
    • Discuss
    • 5. In rectangular waveguides the ratio of width to height is about

    • Options
    • A. 0.5
    • B. 1
    • C. 2
    • D. 4
    • Discuss
    • 6. If QL is loaded Q, QE is external Q and QU is unloaded Q of a microwave resonator, then

    • Options
    • A.
    • B.
    • C.
    • D. QL = QE + QU
    • Discuss
    • 7. The main advantage of using micro waves for communications is

    • Options
    • A. large bandwidth
    • B. small bandwidth
    • C. low power
    • D. high power
    • Discuss
    • 8. TE10 mode of propagation of electromagnetic energy in waveguides can be thought of as

    • Options
    • A. three TEM waves travelling along length of wave-guide
    • B. One TEM wave travelling along length of wave guide and one TEM wave propagation in the transverse plane
    • C. One TEM wave travelling along the length of wave guide and two TEM waves
    • D. none of the above
    • Discuss
    • 9. Assertion (A): An artificial transmission line can be used as a pulse generator.

      Reason (R): A pulse function is used very frequently in network analysis.


    • 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. Power monitor and reflectometer use the principle of

    • Options
    • A. directional coupler
    • B. klystron amplifier
    • C. Gunn diode
    • D. TWT
    • Discuss


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