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Electronics Engineering Objective Questions { Transmission Lines and Waveguides }

99. The velocity factor of a transmission line
A. Depends on the dielectric constant of the material used
B. Increases the velocity along the transmission line
C. Is governed by the skin effect
D. Is higher for a solid dielectric than for
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100. When the phase velocity of an electromagnetic wave depends on frequency in any medium, the phenomenon is called
A. scattering
B. polarization
C. absorption
D. dispersion
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101. consider the following statements regarding a plane wave propagating through free space : The direction of field 1. `E' is perpendicular to the direction of propagation 2. 'H' is perpendicular to the direction of propagation. 3. `E' is perpendicular to the direction of the field 'H'. Which of these statements are correct?
A. 1 and 2
B. 2 and 3
C. 1 and 3
D. 1,2 and 3
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102. A very lossy,M4 long, 500 transmission line is open circuited at the load end. The input impedance measured at the other end of the line is approximately
D.d) none of the above
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103. A lossless transmission line having 500 characteristic impedance and length X/4 is short circuited at one end and connected to an ideal voltage source of IV at the other end. The current drawn from the voltage source is
B. 0.02 A
D. none of the above
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104. A (75 ? j50)C2 load is connected to a coaxial transmission line of Zo = 750, at 10 GHz. The best method of matching consists in connecting
A. a short-circuited stub at the load
B. an inductance at the load
C. a capacitance at some specific distance from the load
D. a short-circuited stub at some specific distancp from the load
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105.  A transmission line whose characteristic impedance is a pure resistance
A. must be a lossless line
B. must be a distortionless line
C. may not be a lossless line
D. may not be a distortionless line
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