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

  • 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. If wavelength in free space is ?0 wavelength in insulator ?, ?r is relative permittivity or insulato
  • B. If wavelength in free space is ?0 wavelength in insulator ?, ?r is relative permittivity or insulato
  • C. If wavelength in free space is ?0 wavelength in insulator ?, ?r is relative permittivity or insulato
  • D. If wavelength in free space is ?0 wavelength in insulator ?, ?r is relative permittivity or insulato

  • Correct Answer
  •  

    • Microwave Communication problems

    Search Results

    • 1. VSWR = Emax/Emin.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. Generally the wall thickness of rectangular waveguide is

    • Options
    • A. about 1-5 mils
    • B. about 40-100 mils
    • C. about 0.1 to 0.5 mils
    • D. about 500 mils
      • Discuss
    • 3. In a backward wave oscillator the efficiency

    • Options
    • A. is much higher than in TWT
    • B. is much lower than in TWT
    • C. is almost the same as in TWT
    • D. either (a) or (b)
      • Discuss
    • 4. For a given operating frequency a waveguide has more power handling capacity than a coaxial line.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. In a Gunn diode oscillator drift velocity of electron is 107 cm/s and active region length is 10 x 10-4 cm. The natural frequency of oscillation is

    • Options
    • A. 1 MHz
    • B. 10 MHz
    • C. 1 GHz
    • D. 10 GHz
      • Discuss
    • 6. 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
    • 7. 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
    • 8. In a reflex klystron the output frequency is determined primarily by resonant frequency of cavity.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. 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
    • 10. A 'rat race' is a

    • Options
    • A. hybrid junction for microwaves
    • B. a microwave oscillator
    • C. a microwave amplifier
    • D. a microwave antenna
      • Discuss

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