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MCQs

Total Questions : 145 | Page 12 of 15 pages
Question 111. 0. Which of the following conditions will not guarantee a distortionless transmission line?
  1.    R = G = 0
  2.    RC =GL
  3.    Very low frequency range (R>> c)L, G >> cuC)
  4.    Very high frequency range (R
 Discuss Question
Answer: Option C. -> Very low frequency range (R>> c)L, G >> cuC)
Question 112. 2. For a quarter wavelength ideal transmission line of characteristic impedance 50 ohms and load impedance 100 ohms, the input impedance will be
  1.    25
  2.    50 SI
  3.    100 SI
  4.    150 Q
 Discuss Question
Answer: Option A. -> 25
Question 113. 5. A lossless, air dielectric cylindrical wave guide of inside diameter 3cm, is operated at 14GHz. For the TMii mode propagating in +z direction, the wave impedance will be (for TM iv mode, K a =3.832)
  1.    120 TEO
  2.    185 Q
  3.    240 7cf2
  4.    95.25
 Discuss Question
Answer: Option B. -> 185 Q
Question 114. 6. Choose the correct statements for a wave proparating in an air filled rectangular wave guide :
  1.    Guided wavelength is never less than the free space wavelength
  2.    Wave impedance is never less than the free space impedance
  3.    Phase velocities is never less than the free space velocity
  4.    TEM mode is possible if the dimensions of the wave guide are properly chosen
 Discuss Question
Answer: Option A. -> Guided wavelength is never less than the free space wavelength
Question 115. 3. The reflection co-efficient on a line is 0.2 - 45?. the SWR of this line is
  1.    0.8
  2.    1.1
  3.    1.2
  4.    1.5
 Discuss Question
Answer: Option D. -> 1.5
Question 116. 4. For a transmission line the, propagation constant, for a TEM wave travelling in it, is given by (where the symbols have the usual meanings)
  1.    [(R+ jtaL)(G +koC)]
  2.    [(R + jcoL) (G +koC)] ?
  3.    [(R - jo.)L)(G + jcoC)] ?
  4.    [(R - jcoL)(G + jc.o2C)] 1/3
 Discuss Question
Answer: Option B. -> [(R + jcoL) (G +koC)] ?
Question 117. 8. The dominant mode in a rectangular wave guide is TE0, because this mode has
  1.    no attenuation
  2.    no cut off
  3.    no megnetic field component
  4.    the highest cut off wavelengt:;
 Discuss Question
Answer: Option D. -> the highest cut off wavelengt:;
Question 118. 7. Assuming perfect conductor of a transmission line, pure TEM propagation is NOT possible in
  1.    coaxial cable
  2.    air filled cylindical wave guide
  3.    parallel thin wire line in air
  4.    semi infinite parallel plate wave guide
 Discuss Question
Answer: Option D. -> semi infinite parallel plate wave guide
Question 119. 9. When electromagetic waves are propagated in a waveguide
  1.    they travel along the broader walls of the guide
  2.    they are reflected from the walls but do not travel along them
  3.    they travel through the dielectric without tuuching the walls
  4.    they travel along all four walls of the waveguide
 Discuss Question
Answer: Option B. -> they are reflected from the walls but do not travel along them
Question 120. 0. Waveguides are used mainly for microwave signals because
  1.    they depend on straight-line propagation which applies to microwaves only
  2.    losses would be too heavy at lower frequencies
  3.    there are no generators powerful enough to excite them at lowe frequencies
  4.    the would be too bulky at lower frequencies
 Discuss Question
Answer: Option D. -> the would be too bulky at lower frequencies

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