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MCQs

Total Questions : 145 | Page 1 of 15 pages
Question 1.  The relationship between inductance and capacitance per unit length and characteristic impedance of a transmission line is
  1.    Zo = 1/17.6
  2.    Zo = "DT
  3.    Zo = .167j,
  4.    Zo = 2n147
 Discuss Question
Answer: Option B. -> Zo = "DT
Question 2.  The value ofSWR for a transmission line of characteristic impedance Zo when feeding a load of impedance ZL is
  1.    SWR = Zo ? ZL
  2.    SWR = Zo / ZL
  3.    SWR = Zo + ZL
  4.    SWR = ZL / Zo
 Discuss Question
Answer: Option D. -> SWR = ZL / Zo
Question 3.  If a transmission line is terminated with a resistance equalto its characteristic impedance
  1.    the line loss will be maximum
  2.    the input impedance will be twice the terminating resistance
  3.    the standing wave ratio will be minimum
 Discuss Question
Answer: Option C. -> the standing wave ratio will be minimum
Question 4.  The characteristic impedance of a twin-lead cable commonly used for TV lead-in is nearly
  1.    1 ki2
  2.    100 LI
  3.    10 L2
  4.    300
 Discuss Question
Answer: Option D. -> 300
Question 5.  Transmission of power to a load over a transmission line achieves optimum value when standing-wave ratio (SWR) becomes
  1.    2 : 1
  2.    1 : 2
  3.    1: 1
  4.    2 : 2
 Discuss Question
Answer: Option C. -> 1: 1
Question 6.  A Smith chart is used for solving
  1.    propagation problems
  2.    transmission line problems
  3.    antenna problems
  4.    sag problems
 Discuss Question
Answer: Option A. -> propagation problems
Question 7.  A transmission line having Zo = 75 ohm is delivering power to a 300 1 load. Its SWR is
  1.    1 : 4
  2.    4 : 1
  3.    1 : 2
  4.    2 : 1
 Discuss Question
Answer: Option B. -> 4 : 1
Question 8.  If maximum voltage reading on the above line is 50 V, the minimum voltage reading would be volt.
  1.    25
  2.    12.5
  3.    6.25
  4.    37.5
 Discuss Question
Answer: Option B. -> 12.5
Question 9.  Regarding reflection co-efficient (Kr) of a transmission line which statement is not correct? It is the ratio of
  1.    reflected voltage to the incident voltage
  2.    reflectedcurrent to the incident current
  3.    reflected power to the incident power
  4.    characteristic impedance to load impedance
 Discuss Question
Answer: Option C. -> reflected power to the incident power
Question 10. . For perfect match between line and load, value of Kr should be
  1.    0
  2.    1
  3.    between 0 and 1
  4.    more than unity
 Discuss Question
Answer: Option A. -> 0

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