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MCQs

Total Questions : 145 | Page 2 of 15 pages
Question 11. . If a SWR of 4 : 1 exists on a line, percentage reflected power is
  1.    36
  2.    60
  3.    66.7
  4.    40
 Discuss Question
Answer: Option A. -> 36
Question 12. .  If a SWR of 4 : 1 exists on a line, then its reflection co-efficient is
  1.    0.8
  2.    0.6
  3.    0.25
  4.    1.67
 Discuss Question
Answer: Option B. -> 0.6
Question 13. . In a transmission line, the ratio of reflected power to incident power is given bY
  1.    Kr
  2.    1/K1
  3.    1/I(2
  4.    Kr2
 Discuss Question
Answer: Option D. -> Kr2
Question 14. . The reflection co-efficient resulting from mismatching a 50 LI load and a 150 n transmission line is
  1.    0.5
  2.    2
  3.    37.5
  4.    1/75
 Discuss Question
Answer: Option A. -> 0.5
Question 15. . If a SWR of 4 : 1 exists on a line, percentage power absorbed by the load is
  1.    40
  2.    60
  3.    64
  4.    33.3
 Discuss Question
Answer: Option C. -> 64
Question 16. . Indicate the FALSE statement. Higher the value of SWR of a transmission line,
  1.    greater the mismatch between line and load
  2.    greater the power loss
  3.    more the noise
  4.    higher the velocity factor
 Discuss Question
Answer: Option D. -> higher the velocity factor
Question 17. . Which of the following statement is not correct?The function of a quarter-wave transmer is to
  1.    make it appear that load and line are matched reduce line losses
  2.    increase reflection co-efficient
  3.    reduce SWR to 1: 1
 Discuss Question
Answer: Option C. -> higher the velocity factor
Question 18. . A quarter-wave transformer is
  1.    a two-winding conventional transformer having core length equal to X/4
  2.    an auto-transformer having total wiring length equal to X/4
  3.    a segment of transmission line near the load end which is equal in length to one-quarte of wavelength of the signal on the line
  4.    an ordinary transformer used to connect load and line at a distance of X/4 from the input end.
 Discuss Question
Answer: Option C. -> a segment of transmission line near the load end which is equal in length to one-quarte of wavelength of the signal on the line
Question 19. . A transmission line of 50 ohm characteristic impedance is terminated in a resistive load of 100 ohm. The voltage reflection co-efficient equals
  1.    3
  2.    2
  3.    1
  4.    0
 Discuss Question
Answer: Option D. -> 0
Question 20. . Which one of the following statements is WRONG? If the SWR of a transmission line is infinity, it is terminated in a/an
  1.    complex impedance
  2.    short circuit
  3.    open circuit
  4.    pure reactance
 Discuss Question
Answer: Option A. -> complex impedance

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