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MCQs

Total Questions : 145 | Page 6 of 15 pages
Question 51. . Standing wave ratio (SWR) on a transmission line
  1.    is directly proportional to the load impedance and inversely proportional to the characteristic impedance is directly proportional to the
  2.    characteristic impedance and inversely proportional to the load impedance
  3.    may be defined as either (a) or (b)
  4.    none of these
 Discuss Question
Answer: Option C. -> may be defined as either (a) or (b)
Question 52. . Two transmission linear have SWRs of (1/6) and 2 respectively
  1.    The one with SWR = 2 is better matched to the load
  2.    The one with SWR = 1/6 is better matched to the load
  3.    Both are equally well matched
  4.    none of these
 Discuss Question
Answer: Option A. -> The one with SWR = 2 is better matched to the load
Question 53. . Standing wave ratio (SWR) equal to unity implies that
  1.    the transmission line is open circuited
  2.    the transmission line is short circuited
  3.    the transmission line's characteristic impedance equals load impedance
  4.    none of these
 Discuss Question
Answer: Option C. -> the transmission line's characteristic impedance equals load impedance
Question 54. . A transmission line has a VSWR of 3 when terminated in a certain load. The reflection co-effecient is
  1.    1/3
  2.    ?
  3.    3
  4.    1/4
 Discuss Question
Answer: Option B. -> ?
Question 55. . A transmission line having a reflection co-efficient of (1/3) when terminated in a certain load would have VSVVR of
  1.    2
  2.    ?
  3.    3
  4.    1/3
 Discuss Question
Answer: Option A. -> 2
Question 56. . A non-resonant transmission line has no reflections irrespective of the length because
  1.    its characteristic impedance is very small
  2.    its characteristic impedance is very large
  3.    it is always terminated in its characteristic impedance
  4.    none of these
 Discuss Question
Answer: Option C. -> it is always terminated in its characteristic impedance
Question 57. . A 75 CI lines is terminated in a load of 100 C. Percentage of incident power reflected is
  1.    10%
  2.    14%
  3.    2%
  4.    25%
 Discuss Question
Answer: Option B. -> 14%
Question 58. . A transmission line quarter wave section is used to reject an interfering frequency of 100 MHz. Its approximate length is
  1.    3 m
  2.    1.5 m
  3.    75 m
  4.    none of these
 Discuss Question
Answer: Option C. -> 75 m
Question 59. . The waveguides belong to
  1.    TEM class of transmission lines
  2.    quasi-TEM class of transmission lines
  3.    non-TEM class of transmission lines
  4.    none of these
 Discuss Question
Answer: Option C. -> non-TEM class of transmission lines
Question 60. . The co-axial cable belongs to
  1.    TEM class of transmission lines
  2.    quasi-TEM class of transmission lines
  3.    non-TEM class of transmission lines
  4.    none of these
 Discuss Question
Answer: Option A. -> TEM class of transmission lines

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