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Microwave Communication problems

  • 1. In the given figure the circuits for input impedance of a microwave device with output ports match terminated. The device is
    Electronics and Communication Engineering Microwave Communication: In the given figure the circuits for input impedance of a microwave device with output ports match t

  • Options
  • A. E plane tee
  • B. H plane tee
  • C. magic tee
  • D. hybrid ring
    • Discuss
  • 2. Assertion (A): Hollow waveguides are frequently used as transmission lines at microwave frequencies.

    Reason (R): Waveguide has high power handling capacity, low loss and simple structure.


  • 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
  • 3. In a reflex klystron the output frequency is determined primarily by resonant frequency of cavity.

  • Options
  • A. True
  • B. False
    • Discuss
  • 4. Consider the following statements about directional coupler shown in the figure
    Electronics and Communication Engineering Microwave Communication: Consider the following statements about directional coupler shown in the figure

    1. Ports 1 and 2 are decouple
    2. Ports 3 and 4 are decoupled
    3. Pots 1 and 3 are decoupled
    4. Ports 1 and 4 are decoupled
    Which of the above statements are correct?

  • Options
  • A. 1 and 2 only
  • B. 3 and 4 only
  • C. 1, 2 and 3
  • D. 2, 3 and 4
    • Discuss
  • 5. A 'rat race' is a

  • Options
  • A. hybrid junction for microwaves
  • B. a microwave oscillator
  • C. a microwave amplifier
  • D. a microwave antenna
    • Discuss
  • 6. Standard mismatches are used to calibrate SWR and impedance measuring equipments.

  • Options
  • A. True
  • B. False
    • Discuss
  • 7. In rectangular waveguides the ratio of width to height is about

  • Options
  • A. 0.5
  • B. 1
  • C. 2
  • D. 4
    • Discuss
  • 8. 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
  • 9. A waveguide twist is used to change the plane of polarization.

  • Options
  • A. True
  • B. False
    • Discuss
  • 10. 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

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