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

  • Microwaves


  • Options
  • A. get reflected by ionosphere
  • B. are absorbed by ionosphere
  • C. are neither reflected nor absorbed by ionosphere
  • D. are both reflected and absorbed by ionosphere

  • Correct Answer
  • are neither reflected nor absorbed by ionosphere 

    • Microwave Communication problems

    Search Results

    • 1. In a TWT the phase velocity of the axial component of the field on the slow wave structure is kept

    • Options
    • A. equal to velocity of electron
    • B. slightly less than velocity of electron
    • C. slightly more than velocity of electron
    • D. equal to velocity of light in free space
      • Discuss
    • 2. At millimeter wavelength the favoured mode in circular wave guide is

    • Options
    • A. TE01
    • B. TE11
    • C. TE20
    • D. TE21
      • Discuss
    • 3. As frequency is increased, the skin effect

    • Options
    • A. increases
    • B. decreases
    • C. remains the same
    • D. either (b) or (c)
      • Discuss
    • 4. A PIN diode can be used

    • Options
    • A. as a shunt mounted switch
    • B. as a series mounted switch
    • C. both as series or shunt mounted switch
    • D. non of the above
      • Discuss
    • 5. For a 1 cm x 2 cm air filled rectangular waveguide the maximum frequency should be less than about

    • Options
    • A. 1000 MHz
    • B. 5000 MHz
    • C. 14000 MHz
    • D. 140000 MHz
      • Discuss
    • 6. Performance of a PIN diode switch is represented by

    • Options
    • A. insertion loss when switch is off
    • B. insertion loss when switch is on
    • C. insertion loss when switch is on and isolation loss when switch is off
    • D. insertion loss when switch is off and isolation loss when switch is on
      • Discuss
    • 7. The manufacturing technique used to manufacture strip type transmission line is

    • Options
    • A. photoetching technique
    • B. oxidation technique
    • C. cladding
    • D. epitaxial
      • Discuss
    • 8. In microstrip line has dielectric material most commonly used is

    • Options
    • A. silicon
    • B. rubber
    • C. plastic
    • D. bakelite
      • Discuss
    • 9. In the given figure power meters at A and B indicate 1 mW and 110 ?W respectively. VSWR of line is

    • Options
    • A. 1.5
    • B. 2
    • C. 2.5
    • D. 3
      • Discuss
    • 10. The earliest uses of electromagnetic waves were

    • Options
    • A. point to point communication
    • B. radar
    • C. both (a) and (b)
    • D. neither (a) nor (b)
      • Discuss

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