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

  • If a line is open circuited Zin = Z0 tanh (gl).


  • Options
  • A. True
  • B. False

  • Correct Answer
  • False 

    Explanation
    The quantities required to be measured in microwave circuits are frequency, power and impedance.

    Microwave frequency measurement is done by slotted line, resonant cavities and transfer oscillator.

    Microwave power measurement uses bolometers and micromave power meters.

    A self balancing bridge working on the principle of power substitution is commomly used.

    Microwave impedance measurement is done by measurement of reflection coefficient and VSWR.

    A slotted line and probe is a basic tool for these measurements.' Network analyser enables rapid impedance measurement over a broad frequency range.

    Microwave Communication problems

    Search Results

    • 1. In a microwave coaxial line, the maximum operating frequency is f max and breakdown strength of dielectric is Ed' Then maximum power handling capacity is proportional to

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 2. To couple a coaxial line to a parallel wire line it is best to use

    • Options
    • A. slotted line
    • B. balun
    • C. directional coupler
    • D. ?/4 transformer
      • Discuss
    • 3. A cavity resonator is

    • Options
    • A. a hollow metallic enclosure
    • B. a hollow enclosure having magnetic material as its walls
    • C. a hollow enclosure having dielectric material as its walls
    • D. either (b) or (c)
      • Discuss
    • 4. Power gain of a multicavity klystron amplifier is

    • Options
    • A. more than 30 dB
    • B. causes retardation of all electrons
    • C. causes acceleration of some electrons and retardation of others
    • D. none of the above
      • Discuss
    • 5. A line has an attenuation of 0.054 Np/m. The attenuation in decibels is

    • Options
    • A. 4.7 dB/m
    • B. 0.47 dB/m
    • C. 0.54 dB/m
    • D. 5.4 dB/m
      • Discuss
    • 6. Assertion (A): PIN diode is used as a fast switch.

      Reason (R): PIN diode has very high resistance when reverse biased and very low resistance when forward biased.


    • 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
    • 7. Consider the following applications

      1. Switch
      2. Attenuator
      3. Phase shifter
      4. Oscillator
      In which of the above can a PIN diode be used?

    • Options
    • A. 1 2 3 and 4
    • B. 1 2 and 3 only
    • C. 1 and 2 only
    • D. 2, 3 and 4 only
      • Discuss
    • 8. Roughly the time required for microwave cooking as compared to conventional cooking is

    • Options
    • A. about twice
    • B. about half
    • C. about 10 times
    • D. about one-tenth
      • Discuss
    • 9. Which of the following is wrong for a magic used to tee?

    • Options
    • A. E and H arms are decoupled
    • B. coplanar arms are coupled
    • C. all ports are perfectly matched
    • D. A signal into coplanar arm splits equally between E and H arms
      • Discuss
    • 10. The component in the given figure is

    • Options
    • A. attenuator
    • B. T type low pass filter
    • C. T type high pass filter
    • D. phase shifter
      • Discuss

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