GATE ECE

Transmission Lines

Electromagnetics

(Past Years Questions)

Marks 1

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A two wire transmission line terminates in a television set. The VSWR measured on the line is 5.8. The percentage of pow...
GATE ECE 2017 Set 2
The voltage of an electromagnetic wave propagating in a coaxial cable with uniform characteristic impedance is $$V(l) =...
GATE ECE 2017 Set 1
The propagation constant of a lossy transmission line is (2 + j5) $${m^{ - 1}}$$ and its characteristic impedance is (50...
GATE ECE 2016 Set 1
A coaxial cable is made of two brass conductors. The spacing between the conductors is filled with Teflon $$\left( {{\va...
GATE ECE 2015 Set 3
In the following figure, the transmitter Tx sends a wideband modulated RF signal via a coaxial cable to the receiver Rx....
GATE ECE 2014 Set 3
To maximize power transfer, a lossless transmission line is to be matched to a resistive load impedance via a $$\lambda ...
GATE ECE 2014 Set 2
The return loss of a device is found to be 20 dB. The voltage standing wave ratio (VSWR) and magnitude of reflection coe...
GATE ECE 2013
A coaxial cable with an inner diameter of 1 mm and outer diameter of 2.4 mm is filled with a dielectric of relative perm...
GATE ECE 2012
A transmission line of characteristic impedance 50 $$\Omega $$ is terminated by a 50 $$\Omega $$ load. When excited by a...
GATE ECE 2011
A transmission line has a characteristic impedance of 50 $$\Omega $$ and a resistance of 0.1 $$\Omega $$/m. If the line ...
GATE ECE 2010
If the scattering matrix [S] of a two port network is $$$\left[ S \right] = \left[ {\matrix{ {0.2\,\angle \,\,{0^ \ci...
GATE ECE 2010
Many circles are drawn in a Smith chart used for transmission line calculations. The circles shown in Fig. represent ...
GATE ECE 2005
The VSWR can have any value between
GATE ECE 2002
In an impedance Smith chart, a clockwise movement along a constant resistance circle gives rise to
GATE ECE 2002
A transmission line is distortionless if
GATE ECE 2001
The magnitudes of the open-circuit and short-circuit input impedances of a transmission line are 100$$\Omega \,$$ and 25...
GATE ECE 2000
Assuming perfect conductors of a transmission line, pure TEM propagation is NOT possible in
GATE ECE 1999
All transmission line sections shown in Fig. have characteristic impedance $${R_0}\, + \,j0$$. The input impedance $${Z_...
GATE ECE 1998
A transmission line of 50$$\Omega $$ characteristic impedance is terminated with a 100 $$\Omega $$ resistance. The minim...
GATE ECE 1997
A lossless transmission line having 50 $$\Omega $$ characteristic impedance and lenght $$\lambda /4$$ is short ciruited ...
GATE ECE 1996
The capacitance per unit length and the characteristic impedance of a lossless transmission line are C and $$Z_0$$ respe...
GATE ECE 1996
A load impedance (200 + j0) $$\Omega $$ is to be matched to a 50$$\Omega $$ lossless transmission line by using a quarte...
GATE ECE 1994

Marks 2

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A microwave circuit consisting of lossless transmission lines $$T_1$$ and $$T_2$$ is shown in the figure. The plot shows...
GATE ECE 2016 Set 2
A lossless microstrip transmission line consists of a trace of width w. It is drawn over a practically infinite ground ...
GATE ECE 2016 Set 2
Consider the 3 m long lossless air-filled transmission line shown in the figure. It has a characteristic impedance of $$...
GATE ECE 2015 Set 3
A 200 m long transmission line having parameters shown in the figure is terminated into a load ܴ$$R_L$$. The line is con...
GATE ECE 2015 Set 3
In the transmission line shown, the impedance $${Z_{in}}$$ (in ohms) between node A and the ground is ...
GATE ECE 2014 Set 2
For a parallel plate transmission line, let v be the speed of propagation and Z be the characteristic impedance. Neglect...
GATE ECE 2014 Set 1
A transmission line with a characteristic impedance of 100 $$\Omega $$ is used to match a 50 $$\Omega $$ section to a 20...
GATE ECE 2012
A transmission line of characteristic impedance 50 $$\Omega $$ is terminated in a load impedance $$Z_L$$. The VSWR of t...
GATE ECE 2011
In the circuit shown, all the transmission line sections are lossless. The Voltage Standing Wave Ration (VSWR) on the 60...
GATE ECE 2010
A transmission line terminates in two branches, each of length $$\lambda /4$$, as shown.The branches are terminated by 5...
GATE ECE 2009
One end of loss-less transmission line having the characteristic impedance of 75 $$\Omega $$ and length of 1 cm is short...
GATE ECE 2008
A load of 50 $$\Omega $$ is connected in shunt in a 2-wire transmission line of $$Z_0$$ = 50 $$\Omega $$ as shown in the...
GATE ECE 2007
The parallel branches of a 2-wire transmission line are terminated in 100 $$\Omega $$ and 200 $$\Omega $$ resistors as s...
GATE ECE 2007
Characteristic impedance of a transmission line is 50$$\Omega $$. Input impedance of the open-circuited line is $${Z_{oc...
GATE ECE 2005
Voltage standing wave pattern in a lossless transmission line with characteristic impedance 50 $$\Omega $$ and a resisti...
GATE ECE 2005
Voltage standing wave pattern in a lossless transmission line with characteristic impedance 50 $$\Omega $$ and a resisti...
GATE ECE 2005
Consider a 300$$\Omega $$, quarter-wave long (at 1 GHz) transmission line as shown in Fig. It is connected to a 10V, 50$...
GATE ECE 2004
Consider an impedance Z = R + jX marked with point P in an impedance Smith chart as shown in Fig. The movement from poin...
GATE ECE 2004
A lossless transmission line is terminated in a load which reflects a part of the incident power. The measured VSWR is 2...
GATE ECE 2004
A short-circuited stub is shunt connected to a transmission line as shown in Fig. If $${Z_0} = 50\,\,\Omega $$, the admi...
GATE ECE 2003
In a twin-wire transmission line in air, the adjacent voltage maxima are at 12.5 cm and 27.5. The operating frequency is...
GATE ECE 1999
In air, a lossless transmission line of length 50 cm with $$L = 10\,\mu H/m,\,\,C = 40\,\,pF/m$$ is operated at 25 MHz....
GATE ECE 1999
If a pure resistance load, when connected to a lossless 75-ohm line, produces a VSWR of 3 on the line, then the load imp...
GATE ECE 1994
Consider a transmission line of characteristic impedance 50 ohm. Let it be terminated at one end by ( + j50) ohm. The VS...
GATE ECE 1993
A transmission line whose characteristic impedance is a pure resistance
GATE ECE 1992
The input impedance of a short-circuited lossless transmission line guarter wave long is
GATE ECE 1991
A 50 ohm lossless transmission line has a pure reactance of (j100) ohms as its load. The VSWR in the line is :
GATE ECE 1989
A two - wire transmission line of characteristic impedance $$Z_0$$ is connected to a load of impedance $${Z_L}({Z_L}\, \...
GATE ECE 1988
A transmission line of pure resistive characteristic impedance is terminated with an unknown load. The measured value of...
GATE ECE 1987

Marks 5

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The three regions shown in Fig. are all lossless and non-magnetic. Find (a) Wave impedance in mediums 2 and 3. (b) d ...
GATE ECE 2000
A $${\lambda \over 2}$$ section of a 600 $$\Omega $$ transmission line, short ciruited at one end and open circuited at...
GATE ECE 1997

Marks 10

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A 200 volt (r. m. s) generator having an internal resistance of 200 ohm is feeding a loss-less transmission line. The ch...
GATE ECE 1990

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