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  • Question

  • Reflex klystron oscillator is essentially a low power device


  • Options
  • A. True
  • B. False

  • Correct Answer
  • True 

    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 number of PM radio channels which can be accommodated in a spectrum of 300 MHz is about

    • Options
    • A. 10
    • B. 100
    • C. 500
    • D. 1500
      • Discuss
    • 2. What are the values of Emax and Emin displayed on the oscilloscope, when a 1 kV P-P carries is modulated to 50%?

    • Options
    • A. 2 kV, 0.5 kV
    • B. 1 kV, 0.5 kV
    • C. 0.75 kV, 0.25 kV
    • D. 0.5 kV, 1.5 kV
      • Discuss
    • 3. For air filled circular waveguides

    • Options
    • A. the attenuation due to imperfect conducting walls is negligible
    • B. the attenuation due to imperfect dielectric is negligible
    • C. both the attenuation i.e. due to imperfect conducting walls and due to imperfect dielectric are significant
    • D. the total attenuation is almost zero
      • Discuss
    • 4. When .4546 E 5 and .5433 E 7 are to be added in normalized floating point mode

    • Options
    • A. none of the numbers is changed to any other form
    • B. .4546 E 5 is changed .004546 E 7 and .5433 E 7 is not changed
    • C. .5433 E 7 is changed to 54.33 E 5 and .4546 E 5 is not changed
    • D. both the numbers are changed and their exponents are made equal to 6
      • Discuss
    • 5. A short circuited stub is preferred to an open circuited stub because an open circuited stub

    • Options
    • A. is more difficult to fabricate and construct
    • B. is made of transmission line of different Z0
    • C. is liable to radiate
    • D. is incapable of giving full range of reactance
      • Discuss
    • 6. As compared to an ordinary semiconductor diode, a Schottky diode

    • Options
    • A. has lower cut in voltage
    • B. has higher cut in voltage
    • C. lower reverse saturation current
    • D. both (b) and (c)
      • Discuss
    • 7. For a superconductor, the relative permeability is

    • Options
    • A. zero
    • B. high
    • C. low
    • D. either low or high
      • Discuss
    • 8. A rectangular wave guide has two stubs each of length connected at the source end. The stubs are circuited. Then the stubs present

    • Options
    • A. an infinite impedance in shunt with line
    • B. an infinite impedance in series with line
    • C. a zero impedance in shunt with line
    • D. a finite impedance in shunt with line
      • Discuss
    • 9. Power monitor and reflectometer use the principle of

    • Options
    • A. directional coupler
    • B. klystron amplifier
    • C. Gunn diode
    • D. TWT
      • Discuss
    • 10. We can know the arrangement of atom in a material by studying electron diffraction pattern.

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

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