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

  • 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

  • Correct Answer
  • is increased 

    • Microwave Communication problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. 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
    • 4. For l << ?, the equivalent circuit of a microwave resistor is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 5. Consider the following statements about radar Beacon

      1. It is also called transponder.
      2. It includes pulse transmitter, receiver and antenna.
      3. It replies with full power even when the signal receives is weak.
      Which of the above statements are correct?

    • Options
    • A. All
    • B. 1 and 2 only
    • C. 2 and 3 only
    • D. 2 only
      • Discuss
    • 6. The noise figure of klystron amplifier is about

    • Options
    • A. 25 dB
    • B. 3 dB
    • C. zero
    • D. 1 dB
      • Discuss
    • 7. 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
    • 8. 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
    • 9. 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
    • 10. 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

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