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

  • 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

  • Correct Answer
  • 10 GHz 

    • Microwave Communication problems

    Search Results

    • 1. Which modes of circular wave guides have circular symmetry?

    • Options
    • A. TE11
    • B. TE11 and TE21
    • C. TE01
    • D. TE01 and TM01
      • Discuss
    • 2. Guide wavelength (?g), cutoff wavelength (?c) and free space wavelength (?0) of a waveguide are related as

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 3. Which of these statements is correct?

    • Options
    • A. Ridge guide is essentially a form of capacitively loaded guide.
    • B. Ridge guide is essentially a form of inductively loaded guide.
    • C. Ridge guide is essentially a form of resistively loaded guide.
    • D. Ridge guide has higher power handling capacity than rectangular waveguide.
      • Discuss
    • 4. In a multicavity klystron amplifier the electron velocity of the order of

    • Options
    • A. 10 m/s
    • B. 103 m/s
    • C. 106 m/s
    • D. 1012 m/s
      • Discuss
    • 5. In a shield helix

    • Options
    • A. the spacing between adjacent turns is very large
    • B. the spacing between adjacent turns approaches zero
    • C. the spacing between adjacent turns approaches zero and wire thickness approaches zero
    • D. the spacing between adjacent turns is very large wire thickness approaches zero
      • Discuss
    • 6. For a given operating frequency a waveguide has more power handling capacity than a coaxial line.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. 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
    • 8. 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
    • 9. VSWR = Emax/Emin.

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

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