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MCQs

Total Questions : 145 | Page 9 of 15 pages
Question 81. . Which of the following is high frequency transmission me?
  1.    Coaxial cable
  2.    Open wire
  3.    Twin lead
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 82. . The measure of mismatchbetween the load and the. transmission line is known as
  1.    Directivity
  2.    (1 ?Gain)
  3.    Standing wave ratio
  4.    Reflection coefficient
 Discuss Question
Answer: Option D. -> Reflection coefficient
Question 83. . To couple a coaxial line to a parallel wire line it is best to use a
  1.    slotted line
  2.    balun
  3.    directional coupler
  4.    quarter wave transformer
 Discuss Question
Answer: Option B. -> balun
Question 84. .  The distance between consecutive maxima and minima is given by
  1.    2?
  2.    2 A.
  3.    X
  4.    2X
 Discuss Question
Answer: Option D. -> 2X
Question 85. . Which of the following is a false statement? In case the SWR on a transmission line is infinity, the line is terminated in
  1.    a complex impedance
  2.    a pure reactance
  3.    a short circuit
  4.    an open circuit
 Discuss Question
Answer: Option A. -> a complex impedance
Question 86. . Which type of transmission line will have the least characteristic impedance?
  1.    Open wire line
  2.    Twin lead line
  3.    Coaxial cable
  4.    All have same impedance
 Discuss Question
Answer: Option C. -> Coaxial cable
Question 87. .  A high frequency transmission line consists of a pair of open wires having a distributed capacitance of 0.01 itF per km and a distributed inductance of 3 mH per kmWhat is the characteristic impedance at 10 MHz?
  1.    547.7 fi
  2.    54.7 SI
  3.    5.47 SZ
  4.    0.547 ki.2
 Discuss Question
Answer: Option A. -> 547.7 fi
Question 88. .  A high frequency transmission line consists of a pair of open wires having a distributed capacitance of 0.01 itF per km and a distributed inductance of 3 mH per km What will be the propagation constant at 10 MHz?
  1.    3.4 radians/km
  2.    34.4 radians/km
  3.    344 radians/km
  4.    3440 radians/km
 Discuss Question
Answer: Option C. -> 344 radians/km
Question 89. . The wavelength of a wave in a waveguide is greater than in free space
  1.    depends on the wavelength dimensions and the free space wavelength
  2.    is inversely proportional to the phase velocity
  3.    is inversely proportional to the phase velocity
  4.    is directly proportional to the group velocity
 Discuss Question
Answer: Option C. -> is inversely proportional to the phase velocity
Question 90. .  Waveguide are used mainly for microwave signal because
  1.    they depend on straight-line propagation which applies to microwave only
  2.    losses would be too heavy at lower frequency
  3.    there are no generators powerful enough to excite them at lower frequencies
  4.    they would be too bulky at lower frequencies
 Discuss Question
Answer: Option A. -> they depend on straight-line propagation which applies to microwave only

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