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Microwave Communication problems

  • 1. A microwave connector should have high SWR.

  • Options
  • A. True
  • B. False
    • Discuss
  • 2. In the given figure shows a 10dB directional coupler. If power input at port 1 is 100 mW, power output at port 3 is
    Electronics and Communication Engineering Microwave Communication: In the given figure shows a 10dB directional coupler. If power input at port 1 is 100 mW, power outp

  • Options
  • A. 10 mW
  • B. 15 mW
  • C. 20 mW
  • D. 25 mW
    • Discuss
  • 3. In Gunn diode electrons are transferred from

  • Options
  • A. Ridge guide is essentially a form of capacitively loaded guide
  • B. low to high mobility energy bands
  • C. valley to domain formation
  • D. domain to valley formation
    • Discuss
  • 4. Satellite communication systems use the frequency band

  • Options
  • A. 10 to 20 MHz
  • B. 50 to 70 MHz
  • C. 3 to 6 GHz
  • D. 100 to 120 GHz
    • Discuss
  • 5. If ?r is relative permeability, ?r is relative permittivity, c is velocity of light fc is cutoff frequency, phase velocity vp (i.e., speed with which a particular phase of the wave travels down a rectangular waveguide at frequency f) is given by

  • Options
  • A.
  • B.
  • C.
  • D.
    • Discuss
  • 6. For a directional coupler the power is in the ratio of

  • Options
  • A. 40 dB
  • B. 30 dB
  • C. 20 dB
  • D. 10 dB
    • Discuss
  • 7. In a high frequency coaxial line and the length of line characteristic impedance is a function of

  • Options
  • A. properties of insulating material only
  • B. inner and outer conductor radius only
  • C. both (a) and (b)
  • D. neither (a) nor (b)
    • Discuss
  • 8. The characteristic impedance of a cable is about

  • Options
  • A. 300 ?
  • B. 50 ?
  • C. 5 ?
  • D. 2 ?
    • Discuss
  • 9. In which of the following devices can the operation be visualised in terms of a series feedback loops?

  • Options
  • A. TWT
  • B. Reflex klystron
  • C. Klystron amplifier
  • D. Backward wave oscillator
    • Discuss
  • 10. Assertion (A): In TE mode for rectangular waveguide.

    Reason (R): In TM mode for rectangular waveguide.


  • Options
  • A. Both A and R are correct and R is correct explanation of A
  • B. Both A and R are correct but R is not correct explanation of A
  • C. A is correct but R is wrong
  • D. A is wrong but R is correct
    • Discuss

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