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  • Question

  • The noise figure of klystron amplifier is about


  • Options
  • A. 25 dB
  • B. 3 dB
  • C. zero
  • D. 1 dB

  • Correct Answer
  • 25 dB 

    • Microwave Communication problems

    Search Results

    • 1. If air pressure in a rectangular waveguide is increased the maximum power handling capacity

    • Options
    • A. is decreased
    • B. is increased
    • C. remains the same
    • D. may increase or decrease depending on pressure
      • Discuss
    • 2. A square waveguide carries TE11 mode whose axial magnetic field is given by Hz = H0 , where the guide dimensions are in cms. The cut off frequency of the mode is

    • Options
    • A. 5 GHz
    • B. 7.5 GHz
    • C. 6.5 GHz
    • D. 8 GHz
      • Discuss
    • 3. 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
    • 4. The usable bandwidth of ridge wave guide

    • Options
    • A. is lower than that of rectangular waveguide
    • B. is higher than that of rectangular waveguide
    • C. is almost same as that of rectangular waveguide
    • D. is very small as compared to that of rectangular waveguide
      • Discuss
    • 5. For l << ?, the equivalent circuit of a microwave resistor is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 6. If the peak transmitted power in a radar is increased by a factor 81, the maximum range is increased by a factor of

    • Options
    • A. 3
    • B. 9
    • C. 27
    • D. 81
      • Discuss
    • 7. Which of the following statements is not correct regarding modes of electromagnetic energy transmission?

    • Options
    • A. In TE mode the direction of electric field is always and everywhere transverse to the direction of propagation
    • B. In TM mode the magnetic field pattern is always and everywhere transverse to the direction of propagation
    • C. The subscripts is TE and TM designations denote the number of half sine wave variations of the field components in x and y directions respectively.
    • D. TM11 is called the dominant mode.
      • Discuss
    • 8. In 8 cavity magnetron the p mode corresponds to a total phase shift equal to

    • Options
    • A. ± 8 p radians around the periphery
    • B. ± 4 p radians around the periphery
    • C. ± 2 p radians around the periphery
    • D. ± 16 p radians around the periphery
      • Discuss
    • 9. Oscillations are obtained from a reflex klystron only for combinations of anode voltage and repeller voltage that give a favourable transit time.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. In microwave communication links the fading due to rain occurs. The methods to solve this problem include

    • Options
    • A. antenna replacement and feed correction
    • B. amplitude trimming and phase correction
    • C. polarization shifting and code diversity
    • D. path diversity and frequency diversity
      • Discuss

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