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  • Question

  • Consider the following statements

    1. Fading of signals is generally greatest near radio horizon.
    2. Fading of signals is generally greatest in shadow zone.
    3. Fading is small when a good optical path is present.
    Which of the above statements are correct?


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

  • Correct Answer
  • 1, 2 and 3 

    • Microwave Communication problems

    Search Results

    • 1. A rectangular waveguide has width a. Then at the cutoff frequency (with corresponding wave length ?c)

    • Options
    • A.
    • B. a = ?c
    • C.
    • D. a = 2?c
      • Discuss
    • 2. Compared to coaxial lines, the advantages of wave guides are

    • Options
    • A. higher power handling capacity
    • B. lower loss per unit length
    • C. cheaper and simple mechanical structure
    • D. all of the above
      • Discuss
    • 3. Consider the following statements, SWR of a transmission line is infinite when the load is

      1. a short circuit
      2. a complex impedance
      3. an open circuit
      4. a pure reactance
      Which of the above statements are correct?

    • Options
    • A. 1 and 3 only
    • B. 1, 2, 3
    • C. 2, 3, 4
    • D. 1, 2, 4
      • Discuss
    • 4. Dielectric constant and conductivity of rocky soil and flat sandy soil are around

    • Options
    • A. 10 and 20 mho/cm respectively
    • B. 20 and 10 mho/cm respectively
    • C. 2 and 5 mho/cm respectively
    • D. 0.5 and 2 mho/cm respectively
      • Discuss
    • 5. Power monitor and reflectometer use the principle of

    • Options
    • A. directional coupler
    • B. klystron amplifier
    • C. Gunn diode
    • D. TWT
      • Discuss
    • 6. A line of length less than and open circuited at far end behaves as

    • Options
    • A. inductance L
    • B. capacitance C
    • C. L and C in series
    • D. L and C in parallel
      • Discuss
    • 7. Ridge waveguide is essentially a form of capacitively loaded guide.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. The arrangement in the given figure is a hybid T. If 100 mW fed at port 1, the power reflected back at port 1 is

    • Options
    • A. 0
    • B. 25 mW
    • C. 50 mW
    • D. 100 mW
      • Discuss
    • 9. Frequency range for satellite communication is

    • Options
    • A. 1 kHz to 100 kHz
    • B. 100 kHz to 10 MHz
    • C. 10 MHz to 100 MHz
    • D. 1 GHz to 30 GHz
      • Discuss
    • 10. A TEM wave is incident normally on a perfect conductor. The E and H fields at boundary will respectively be

    • Options
    • A. minimum and maximum
    • B. minimum and minimum
    • C. maximum and minimum
    • D. maximum and maximum
      • Discuss

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