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  • Question

  • Consider the following statements about directional coupler shown in the figure
    Consider the following statements about directional coupler shown in the figure Ports 1 and 2 are de

    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

  • Correct Answer
  • 1 and 2 only 

    • Microwave Communication problems

    Search Results

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

    • Options
    • A. True
    • B. False
      • 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 the given figure the circuits for input impedance of a microwave device with output ports match terminated. The device is

    • Options
    • A. E plane tee
    • B. H plane tee
    • C. magic tee
    • D. hybrid ring
      • Discuss
    • 4. If wavelength in free space is ?0 wavelength in insulator ?, ?r is relative permittivity or insulator and ?r is relative permittivity or insulator, then

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 5. VSWR = Emax/Emin.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. A 'rat race' is a

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

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

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

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

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