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Microwave Communication problems

  • 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. 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
    • Discuss
  • 3. A line of length less than Electronics and Communication Engineering Microwave Communication: 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
  • 4. Ridge waveguide is essentially a form of capacitively loaded guide.

  • Options
  • A. True
  • B. False
    • Discuss
  • 5. 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
    Electronics and Communication Engineering Microwave Communication: The arrangement in the given figure is a hybid T. If 100 mW fed at port 1, the power reflecte

  • Options
  • A. 0
  • B. 25 mW
  • C. 50 mW
  • D. 100 mW
    • Discuss
  • 6. 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
  • 7. 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
  • 8. As compared to LED, LASER has

    1. higher emission efficiency
    2. no tuning arrangement
    3. narrow spectral width
    4. provision for confinement
    Of these statements

  • Options
  • A. 1, 2, 3 are correct
  • B. 1, 2, 4 are correct
  • C. 1 and 3 are correct
  • D. 1, 3, 4 are correct
    • Discuss
  • 9. Consider the following statements about a magic tee

    1. The collinear arms are isolated from each other.
    2. On of the collinear arms is isolated from E arm.
    3. On of the collinear arms is isolated from H arm.
    4. E and H arms are isolated from each other.
    Of the above statements

  • Options
  • A. 1 and 2 are correct
  • B. 1 and 3 are correct
  • C. 1 and 4 are correct
  • D. 2 and 3 are correct
    • Discuss
  • 10. A directional coupler is used

  • Options
  • A. to transmit microwave signals
  • B. to generate microwave signals
  • C. to measure amplitude and phase of a travelling wave
  • D. both (a) and (b)
    • Discuss

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