This document contains 10 questions related to transmission lines and RF systems for an assignment. The questions cover topics such as calculating reflection coefficients for mismatched lines, determining line parameters from the propagation constant, calculating characteristic impedance, reflection loss, and more. Students are asked to determine values for line parameters, propagation constants, and solve other transmission line problems.

1. Department of
ELECTRONICS AND COMMUNICATION ENGINEERING
SUB CODE: EC8651
SUB NAME: Transmission lines and RF SYstems
YEAR : 2019 - 2020 YEAR/SEM :
Vi
ASSIGNMENT-1 Date of Submission:
S.No
Question
K Level CO
1. A line having characteristic impedance of 50 Ω is terminated in load
impedance of (75 + j75) Ω. Determine the reflection co-efficient.
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2. Find the attenuation and phase shift constant of a wave propagating
along the line whose propagation constant is 1.048x10-4 ∟88.8°.
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3. A transmission line has ZO=745 Ω and ZR=100 Ω. Calculate the
Reflection loss in dB.
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4. Calculate the characteristic impedance of a transmission line if the
following measurements have been made on the line Zoc = 550
∟-60° and Zsc = 500 ∟30°.
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5. A transmission line has the following parameters: R= 48.75 Ω/km,
L= 1.09 m H/Km, G=38.75 μ mho/Km and C= 0.059 μ f/Km.
Determine the characteristic impedance, Propagation constant, α, β
for a frequency of 1600 Hz.
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6. A generator of 1V, 1 KHz supplies power to a 100 Km open wire
line terminated in 200 Ω resistance. The line parameters are R= 10
Ω/Km, L=3.8mH/Km, G = 1 x 10-6 mho/Km , C= 0.0085 µF/Km.
Calculate the characteristic impedance, propagation constant,
reflection coefficient, input impedance ,i/p power, o/p power and
transmission efficiency.
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7. A transmission line operating at 500 MHz has Z0= 80Ω, α= 0.04 Np/m,
β=1.5 rad/m. Find the line parameters series resistance (R Ω/m), series
inductance (L H/m), shunt conductance (G mho/m) and capacitance
between conductors (C F/m).
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8. The characteristic impedance of a uniform transmission line is
2309.6 ohms at a frequency of 800 MHz. At this frequency the
propagation constant is 0.054(0.0366+j0.99). Determine R and L.
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9. A transmission line has the following parameters per km R=15Ω,
C=15μf, L=1mH and G=1μ mho. Find the additional inductance to
give distortion less transmission. Calculate attenuation and phase
constant for the loaded line.
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10. Find the primary and secondary constants of the line 50 km long
when ZOC measured by the bridge at 700 Hz is 286∟-40° ohms and
ZSC is 1520∟16° ohms.
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