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

  • 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

  • Correct Answer
  • Both A and R are correct but R is not correct explanation of A 

    • Microwave Communication problems

    Search Results

    • 1. 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
    • 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. 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
    • 4. A parametric amplifier uses

    • Options
    • A. non linear resistance
    • B. non linear reactance
    • C. either (a) or (b)
    • D. neither (a) nor (b)
      • Discuss
    • 5. As frequency increases, the transmission efficiency

    • Options
    • A. decreases
    • B. increases
    • C. is not affected
    • D. either (a) or (c)
      • Discuss
    • 6. 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
    • 7. 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
    • 8. A microstrip line has ?r = 9. The normalised wavelength is about

    • Options
    • A. 10
    • B. 2
    • C. 1
    • D. 0.4
      • Discuss
    • 9. 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
    • 10. 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

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