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  • Question

  • 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)

  • Correct Answer
  • is almost the same as in TWT 

    • Microwave Communication problems

    Search Results

    • 1. For a given operating frequency a waveguide has more power handling capacity than a coaxial line.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. 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
    • 3. Which modes of circular wave guides have circular symmetry?

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

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 5. 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
    • 6. 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
    • 7. VSWR = Emax/Emin.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. 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
    • 9. 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
    • 10. 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

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