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Home Electronics and Communication Engineering Microwave Communication See What Others Are Saying!
  • Question
  • In a reflex klystron oscillator, repeller electrode is at


  • Options
  • A. low positive potential
  • B. high positive potential
  • C. negative potential
  • D. zero potential

  • Correct Answer
  • negative potential 

    Explanation
    It uses a single cavity resonator for generating microwave oscillations.

    Its parts are electron gun, resonator, repeller and output coupling.

    It operates on the principle of positive feed back.

    The repeller electrode is at negative potential and sends the partially bunched electron beam back to resonator cavity.

    This positive feedback supports oscillations. Its feature are:

    1. Frequency range - 2 to 100 GHz

    2. Power output - 10 MW to about 2 W

    3. Efficiency - 10 - 20 %

    Its applications include radar receivers, local oscillator in microwave devices, oscillator for microwave measurements in laboratories etc.


    More questions

    • 1. The symbol in figure is for

    • Options
    • A. UJT
    • B. PUT
    • C. SCS
    • D. SBS
    • Discuss
    • 2. Which of these devices can conduct in both directions?

    • Options
    • A. SCR
    • B. SUS
    • C. SBS
    • D. UJT
    • Discuss
    • 3. 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
    • 4. A typical signal strength received from a geosynchronous communication satellite is of the order of a few

    • Options
    • A. milliwatts
    • B. kilowatts
    • C. picowatts
    • D. watts
    • Discuss
    • 5. The temperature at which some materials become superconductors is called

    • Options
    • A. Transition temperature
    • B. Curie temperature
    • C. Neel temperature
    • D. Onnes temperature
    • Discuss
    • 6. The advantage of modified series inverter with two inductors and two capacitors is

    • Options
    • A. the intermittent operation of battery is avoided
    • B. efficiency of circuit is more
    • C. the output frequency is low
    • D. all of the above
    • Discuss
    • 7. A chopper cannot be line commutated.

    • Options
    • A. True
    • B. False
    • Discuss
    • 8. Three point tracking can be achieved with

    • Options
    • A. gang condenser
    • B. variable selectivity
    • C. paddar capacitor
    • D. any of the above
    • Discuss
    • 9. In TE and TM modes of rectangular waveguides having propagation in z direction

    • Options
    • A. Ez and Hz are both zero
    • B. In TE mode Ez is zero and in TM mode Hz is zero
    • C. In TE mode Hz is zero and in TM mode Ez is zero
    • D. In both TE and TM modes both Ez and Hz are non-zero
    • Discuss
    • 10. Standard AM radio broadcasts are confined to

    • Options
    • A. MF
    • B. HF
    • C. VHF
    • D. UHF
    • Discuss


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