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Microwave Communication problems

  • 1. The secondary constants of a line are

  • Options
  • A. Z0
  • B. Z0 and ?
  • C. Z0, ? and wave velocity
  • D. Z0, ? and L
    • Discuss
  • 2. To ensure that only dominant TE10 mode propagates in a rectangular waveguide, the operating frequency

  • Options
  • A. must be more than cutoff frequency of TE10 mode
  • B. must be less than cutoff frequency of TE20 mode
  • C. must be more than cutoff frequency of TE10 mode and less than cutoff frequency of TE20 mode
  • D. must be less than cutoff frequency of TE10 mode
    • Discuss
  • 3. Z0 = (Zoc Zsc)0.5

  • Options
  • A. True
  • B. False
    • Discuss
  • 4. Characteristic impedance of a coaxial cable is inversely proportional to ?r.

  • Options
  • A. True
  • B. False
    • Discuss
  • 5. The following components are used to measure power output of a 2 kW TWT amplifier

    1. TWT
    2. Low pass/High pass filter
    3. Low power 20 dB attenuator
    4. 40 dB directional coupler with matched load
    5. Power meter.
    The correct sequence of connections of these components is:

  • Options
  • A. 1, 4, 2, 3, 5
  • B. 1, 3, 4, 2, 5
  • C. 1, 2, 4, 3, 5
  • D. 1, 4, 3, 2, 5
    • Discuss
  • 6. Hollow waveguides are used as transmission lines at frequencies

  • Options
  • A. above 1 GHz
  • B. above 5 GHz
  • C. above 10 MHz
  • D. above 1 MHz
    • Discuss
  • 7. A rectangular wave guide has two stubs each of length Electronics and Communication Engineering Microwave Communication: A rectangular wave guide has two stubs each of length connected at the source end. The stubs are circuited. Then the stubs present

  • Options
  • A. an infinite impedance in shunt with line
  • B. an infinite impedance in series with line
  • C. a zero impedance in shunt with line
  • D. a finite impedance in shunt with line
    • Discuss
  • 8. A 3 port circulator is in the given figure. Its scattering matrix is
    Electronics and Communication Engineering Microwave Communication: A 3 port circulator is in the given figure. Its scattering matrix is

  • Options
  • A.
  • B.
  • C.
  • D.
    • Discuss
  • 9. Integrated fin line can be utilized as a medium for constructing millimeter wave circuits.

  • Options
  • A. True
  • B. False
    • Discuss
  • 10. A line of length slightly longer than Electronics and Communication Engineering Microwave Communication: A line of length slightly longer than and open circuited at far end behaves as

  • Options
  • A. inductance L
  • B. capacitance C
  • C. L and C in series
  • D. L and C in parallel
    • Discuss

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