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

  • Which one of the following can be used for amplification of microwave energy?


  • Options
  • A. TWT
  • B. Magnetron
  • C. Reflex klystron
  • D. Gunn diode

  • Correct Answer
  • TWT 

    • Microwave Communication problems

    Search Results

    • 1. If 'a' is the width of rectangular wave guide and '?' is the wave length, then

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 2. Which of the following modes of transmission will not be supported by a rectangular waveguide?

    • Options
    • A. TE15
    • B. TE12
    • C. TM11
    • D. TM10
      • Discuss
    • 3. In a TWT the amplitude of resultant wave travelling down the helix remains constant

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. The skin depth at 1000 MHz as compared to that at 500 MHz is

    • Options
    • A. 2
    • B. 12
    • C. 0.707
    • D. 0.5
      • Discuss
    • 5. The reverse voltage applied to a varactor diode

    • Options
    • A. is less than avalanche breakdown voltage
    • B. is more than avalanche breakdown voltage
    • C. may be more or less than a avalanche breakdown voltage
    • D. is very high as compared to avalanche breakdown voltage
      • Discuss
    • 6. The transit time (in cycles) for electrons in repeller space of reflex klystron oscillator for sustaining oscillations is (n is any integer)

    • Options
    • A. 2(n - 1)
    • B. 2n - 1
    • C.
    • D.
      • Discuss
    • 7. If D is diameter of circular waveguide the cutoff wave-length for TE11 mode is equal to

    • Options
    • A. 1.706 D
    • B. 2.11 D
    • C. 0.82 D
    • D. 0.41 D
      • Discuss
    • 8. In the given figure forward current wave has a magnitude of

    • Options
    • A. 0.45 A
    • B. 0.3 A
    • C. 0.2 A
    • D. 0.1 A
      • Discuss
    • 9. The two terms used to describe performance of a directional coupler are

    • Options
    • A. coupling and directivity
    • B. gain and coupling
    • C. gain and directivity
    • D. gain and isolation
      • Discuss
    • 10. Consider the following statements

      1. Gunn diode can be used in combinational logic circuits.
      2. Gunn diode can be used in sequential logic circuits.
      3. Both Gunn diode and GaAs Mesfet can be used in logic circuits.
      Which of the above statements are correct?

    • Options
    • A. 1, 2, and 3
    • B. 1 and 2 only
    • C. 2 and 3 only
    • D. 1 and 3 only
      • Discuss

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