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Electronics Engineering Objective Questions { Transmission Lines and Waveguides }

78. Smith chart can be used to determine
A. SWR for any given transmission line-load mismatch
B. magnitude and angle of reflection co-efficient
C. the length of short circuited transmission line section of known characteristic impedance to provide the desired input impedance
D. all of the above
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79. The phase velocity in a transmission line is
A. v = 17
B. v =1
C. v = LC
D. v =L
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80. The Q of a resonant transmission line is
A. Q = -R
B. Q =R
C. Q = coR
D. Q=R
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81. The measure of mismatchbetween the load and the. transmission line is known as
A. Directivity
B. (1 ?Gain)
C. Standing wave ratio
D. Reflection coefficient
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82. Which of the following is high frequency transmission me?
A. Coaxial cable
B. Open wire
C. Twin lead
D. All of the above
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83. To couple a coaxial line to a parallel wire line it is best to use a
A. slotted line
B. balun
C. directional coupler
D. quarter wave transformer
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84.  The distance between consecutive maxima and minima is given by
A. 2?
B. 2 A.
C. X
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