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Electronics Engineering Objective Questions { Transmission Lines and Waveguides }

106. Transmission of power to a load over a transmission line achieves optimum value when standing-wave ratio (SWR) becomes
A. 2 : 1
B. 1 : 2
C. 1 : 1
D. 2 : 2
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107. The input impedance of a loss-les transmission line is 100 ohms when terminated in a short-circuit, and 64 ohms when terminated in an open circuit. The characteristic impedance of the line is
A. 80 ohms
B. 164 ohms
C. 36 ohms
D. 64 ohms
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108. The electric field at a point from a transmitter radiating a certain power is 2.5 mV/m. If the transmitter power is doubled, the field strength at that point will be about
A. 2.5 mV/m
B. 3.5 mV/m
C. 5 mV/m
D. 10 mV/m
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109. A quarter-wave transformer is used for matching a load of 225 ohms connected to a transmission line of 256 ohms in order to reduce the SWR along the line to 1. The characteristic impedance (in ohms) of the transformer is
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110. Which of the following conditions will not guarantee a distortionless transmission line?
A. R = G = 0
C. Very low frequency range (R>> c)L, G >> cuC)
D. Very high frequency range (R << taL, G <
111. On a resistively terminated high frequency loss-loss transmission line fed by a 500 MHz source, the VSWR is found to be equal to 2 and the first voltage minimum is measured at 30 cm from the load end. What is the value of the "normalised" load resistance?
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112. For a quarter wavelength ideal transmission line of characteristic impedance 50 ohms and load impedance 100 ohms, the input impedance will be
B. 50 SI
C. 100 SI
D. 150 Q
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