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Microwave Communication problems

  • 1. Effect of loading of line is

  • Options
  • A. increase in Z0, a and ?
  • B. increase in Z0 and ? but decrease in a
  • C. decrease in Z0, a and ?
  • D. decrease in Z0 and ? but increase in a
    • Discuss
  • 2. If the repeller voltage in a klystron oscillator is increased the transit time of electron

  • Options
  • A. will be increased
  • B. will be decreased
  • C. will remain the same
  • D. either (a) or (b)
    • Discuss
  • 3. In a magnetron the magnetic flux density is of the order of

  • Options
  • A. 1 mWb/s
  • B. 1 Wb/m2
  • C. 106 m/s
  • D. 1012 m/s
    • Discuss
  • 4. Assertion (A): Bolometer is frequently used in microwave power measurement.

    Reason (R): In a bolometer the input microwave power causes a change in resistance.


  • 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
  • 5. The rotation of direction of E field of a linearly polarized wave passing through a magnetised ferric medium is called

  • Options
  • A. Lorentz rotation
  • B. Faraday rotation
  • C. Steinmitz rotation
  • D. Fleming's rotation
    • Discuss
  • 6. The Q factor of a waveguide resonator is given by (?0 is resonant frequency, U is energy storage and WL is the power loss)

  • Options
  • A.
  • B.
  • C. Q = ?0UWL
  • D.
    • Discuss
  • 7. A microstrip line has ?r = 9. The normalised wavelength Electronics and Communication Engineering Microwave Communication: A microstrip line has ?r = 9. The normalised wavelength is about

  • Options
  • A. 10
  • B. 2
  • C. 1
  • D. 0.4
    • Discuss
  • 8. In the given figure the line voltage after a number of reflections will be
    Electronics and Communication Engineering Microwave Communication: In the given figure the line voltage after a number of reflections will be

  • Options
  • A. 30 V
  • B. -30 V
  • C. 10 V
  • D. -10 V
    • Discuss
  • 9. The first and second subscripts in models of circular waveguides depict

  • Options
  • A. the number of full sine wave variations in circumference in direction and Bessel function variations in radial direction respectively
  • B. the Bessel function variations in radial direction and the number of full sine wave variations in circumference direction respectively
  • C. the Bessel function variations in circumference direction and number of full sine wave variations in radial direction respectively
  • D. none of the above
    • Discuss
  • 10. Which one of the following is true for EM wave propagation through rectangular waveguide of cross-section 2a x a

  • Options
  • A. critical wavelength for TE10 mode is the same as that for TE02 mode
  • B. critical wavelength for TE10 mode is one half of that for TE10 mode
  • C. critical wavelength for TE10 mode is the same as that for TM10 mode
  • D. critical wavelength for TE10 mode is double that for TE01mode
    • Discuss

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