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ECE 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

79. The phase velocity in a transmission line is
A. v = 17
B. v =1
C. v = LC
D. v =L

80. The Q of a resonant transmission line is
A. Q = -R
B. Q =R
C. Q = coR
D. Q=R

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

82. Which of the following is high frequency transmission me?
A. Coaxial cable
B. Open wire
C. Twin lead
D. All of the above

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

84.  The distance between consecutive maxima and minima is given by
A. 2?
B. 2 A.
C. X
D.2X

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