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MCQs

Total Questions : 145 | Page 3 of 15 pages
Question 21. . Regarding stubs which statement is not correct?
  1.    stubs are used for eliminating standing waves on a transmission line
  2.    they are usually placed in parallel with the transmission line close to the load end of the line
  3.    they are nothing else but short sections of the transmission line either open-circuited or short circuited
  4.    generally, they are longer than X/2
 Discuss Question
Answer: Option D. -> generally, they are longer than X/2
Question 22. . The velocity factor of a transmission line
  1.    is always greater than unity
  2.    depends on the permittivity of the surrounding medium
  3.    is least for air medium
  4.    is governed by skin effect
 Discuss Question
Answer: Option B. -> depends on the permittivity of the surrounding medium
Question 23. . A waveguide behaves as a ___filter.
  1.    low-pass
  2.    high-pass
  3.    band-pass
  4.    band-elimination
 Discuss Question
Answer: Option B. -> high-pass
Question 24. . For connecting an unbalanced ecoaxial line to a balanced antenna, we may use
  1.    a balun
  2.    double stub
  3.    directional coupler
  4.    a slotted line
 Discuss Question
Answer: Option A. -> a balun
Question 25. . Impedance inversion at radio frequencies may be applied with the help of a/an
  1.    half-wave line
  2.    short-circuited stub
  3.    quarter-wave transformer
  4.    open-circuited stub
 Discuss Question
Answer: Option C. -> quarter-wave transformer
Question 26. .  Indicate the FALSE statement.
  1.    a piece of line X/4 long and shortcircuited at the far end looks like an open circuit and behaves like a parallel-tuned circuit
  2.    a short-circuit line less than X/4 long behaves like a pure capacitance
  3.    an open-circuited line less than X/4 long behaves like a purecapacitance
  4.    a line k12 long an open-circuited at far end behaves like a parallel-tuned circuit
 Discuss Question
Answer: Option B. -> a short-circuit line less than X/4 long behaves like a pure capacitance
Question 27. . The relationship between the phase velocity vp and the group velocity vg in a waveguiae is
  1.    vP vg = c2
  2.    vP = Vg
  3.    vP v8
  4.    v= 1 = c2/2
 Discuss Question
Answer: Option A. -> vP vg = c2
Question 28. . Short-circuited stubs are preferred to open-circuited ones because they
  1.    are easier to make
  2.    are not liable to radiate
  3.    have variable matching properties
  4.    are made of the same transmission line as the one to which they are connected
 Discuss Question
Answer: Option B. -> are not liable to radiate
Question 29. . A 6-GHz wave is being propagated in a parallel-plane waveguide having a plane separation of 3 cm. The cut-off wavelength Xo for dominant mode is ___ cm.
  1.    6
  2.    2
  3.    5
  4.    12
 Discuss Question
Answer: Option A. -> 6
Question 30. . A rectangular or a circular waveguide is
  1.    a resonant circuit
  2.    high-phase filter
  3.    low-pass filter
  4.    none of the above
 Discuss Question
Answer: Option B. -> high-phase filter

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