Electronics and Communication Engineering
GATE ECE concept:characteristic-impedance PYQs
Build your understanding with focused practice from past exam papers.
How to practice concept:characteristic-impedance
Attempt a question, record the concept and assumptions, then check the available answer. Rework mistakes after revising the relevant concepts. Topic tags can overlap; review the question context.
Questions 1–6 of 6. Imported answers require independent review unless marked reviewed.
Question 52
Open questionECMCQ2 marksNeeds review
A complex load (in Ω) is represented as
on the Smith chart. A co-axial cable with a characteristic impedance of 50 Ω is connected to the load. The new input impedance of the load now moves to a diametrically opposite point on the same Γ circle on the Smith chart.Which option is the nearest input impedance of the cable connected load (in Ω)?
Your answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 58
Open questionECNAT2 marksNeeds review
A lossless transmission line with characteristic impedance
is terminated with an unknown load. The magnitude of the reflection co-efficient is
. As one moves towards the generator from the load, the maximum value of the input impedance magnitude looking towards the load (in
) is ______.Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 35
Open questionECMCQ2 marksNeeds review
The impedance matching network shown in the figure is to match a lossless line having characteristic impedance
with a load impedance
. A quarter-wave line having a characteristic impedance
is connected to
. Two stubs having characteristic impedance of 75 Ω each are connected to this quarter-wave line. One is a short-circuited (S.C.) stub of length
connected across PQ and the other is an open-circuited (O.C.) stub of length
connected across RS. 
The impedance matching is achieved when the real part of
isYour answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 21
Open questionECNAT1 markNeeds review
A transmission line of length
and having a characteristic impedance of 50
is terminated with a load of 400
. The impedance (rounded off to two decimal places) seen at the input end of the transmission line is ______
.Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 21
Open questionECNAT1 markNeeds review
A lossless transmission line has resistance per unit length
. The line is distortionless and has characteristic impedance of
. The attenuation constant (in Np/m, correct to three decimal places) of the line is ________.Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 24
Open questionECNAT1 markNeeds review
The voltage of an electromagnetic wave propagating in a coaxial cable with uniform characteristic impedance is
Volts, where
is the distance along the length of the cable in metres,
is the complex propagation constant, and
is the angular frequency. The absolute value of the attenuation in the cable in dB/metre is ________.Log in to check the answer
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