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Microwave Communication problems

  • 1. 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
  • 2. 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
  • 3. Guide wavelength (?g), cutoff wavelength (?c) and free space wavelength (?0) of a waveguide are related as

  • Options
  • A.
  • B.
  • C.
  • D.
    • Discuss
  • 4. Which modes of circular wave guides have circular symmetry?

  • Options
  • A. TE11
  • B. TE11 and TE21
  • C. TE01
  • D. TE01 and TM01
    • 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. 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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