# Transmission Lines · Electromagnetics · GATE ECE

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## Marks 1

GATE ECE 2017 Set 2
A two wire transmission line terminates in a television set. The VSWR measured on the line is 5.8. The percentage of power that is reflected from the ...
GATE ECE 2017 Set 1
The voltage of an electromagnetic wave propagating in a coaxial cable with uniform characteristic impedance is $$V(l) = {e^{ - \gamma l\, + \,j\,\ome... GATE ECE 2016 Set 1 The propagation constant of a lossy transmission line is (2 + j5)$${m^{ - 1}}$$and its characteristic impedance is (50 + j0)$$\Omega $$at$$\omega...
GATE ECE 2015 Set 3
A coaxial cable is made of two brass conductors. The spacing between the conductors is filled with Teflon $$\left( {{\varepsilon _r} = 2.1,\,\,\tan \,... GATE ECE 2014 Set 3 In the following figure, the transmitter Tx sends a wideband modulated RF signal via a coaxial cable to the receiver Rx. The output impedance$${Z_T}$... GATE ECE 2014 Set 2 To maximize power transfer, a lossless transmission line is to be matched to a resistive load impedance via a $$\lambda /4$$ transformer as shown. ... GATE ECE 2013 The return loss of a device is found to be 20 dB. The voltage standing wave ratio (VSWR) and magnitude of reflection coefficient are respectively. GATE ECE 2012 A coaxial cable with an inner diameter of 1 mm and outer diameter of 2.4 mm is filled with a dielectric of relative permittivity 10.89. Given $${\mu _... GATE ECE 2011 A transmission line of characteristic impedance 50$$\Omega $$is terminated by a 50$$\Omega $$load. When excited by a sinusoidal voltage source at ... GATE ECE 2010 A transmission line has a characteristic impedance of 50$$\Omega $$and a resistance of 0.1$$\Omega $$/m. If the line is distortionless, the attenua... GATE ECE 2010 If the scattering matrix [S] of a two port network is$$$\left[ S \right] = \left[ {\matrix{ {0.2\,\angle \,\,{0^ \circ }} & {0.9\,\,\angle \,\...
GATE ECE 2005
Many circles are drawn in a Smith chart used for transmission line calculations. The circles shown in Fig. represent ...
GATE ECE 2002
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 2001
A transmission line is distortionless if
GATE ECE 2000
The magnitudes of the open-circuit and short-circuit input impedances of a transmission line are 100$$\Omega \,$$ and 25$$\Omega \,$$ respectively. Th...
GATE ECE 1999
Assuming perfect conductors of a transmission line, pure TEM propagation is NOT possible in
GATE ECE 1998
All transmission line sections shown in Fig. have characteristic impedance $${R_0}\, + \,j0$$. The input impedance $${Z_{in}}$$ equals ...
GATE ECE 1997
A transmission line of 50$$\Omega$$ characteristic impedance is terminated with a 100 $$\Omega$$ resistance. The minimum impedance measured on the l...
GATE ECE 1996
A lossless transmission line having 50 $$\Omega$$ characteristic impedance and lenght $$\lambda /4$$ is short ciruited at one end and connected to an...
GATE ECE 1996
The capacitance per unit length and the characteristic impedance of a lossless transmission line are C and $$Z_0$$ respectively. The velocity of a tra...
GATE ECE 1994
A load impedance (200 + j0) $$\Omega$$ is to be matched to a 50$$\Omega$$ lossless transmission line by using a quarter wave line transformer (QWT)....

## Marks 2

GATE ECE 2016 Set 2
A microwave circuit consisting of lossless transmission lines $$T_1$$ and $$T_2$$ is shown in the figure. The plot shows the magnitude of the input re...
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 plane and is separated by a die...
GATE ECE 2015 Set 3
Consider the 3 m long lossless air-filled transmission line shown in the figure. It has a characteristic impedance of $$120\pi \,\Omega$$, is termina...
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 connected to a 400 V source havin...
GATE ECE 2014 Set 2
In the transmission line shown, the impedance $${Z_{in}}$$ (in ohms) between node A and the ground is ...
GATE ECE 2014 Set 1
For a parallel plate transmission line, let v be the speed of propagation and Z be the characteristic impedance. Neglecting fringe effects, a redution...
GATE ECE 2012
A transmission line with a characteristic impedance of 100 $$\Omega$$ is used to match a 50 $$\Omega$$ section to a 200 $$\Omega$$ section. If the ...
GATE ECE 2011
A transmission line of characteristic impedance 50 $$\Omega$$ is terminated in a load impedance $$Z_L$$. The VSWR of the line is measured as 5 and t...
GATE ECE 2010
In the circuit shown, all the transmission line sections are lossless. The Voltage Standing Wave Ration (VSWR) on the 60W line is ...
GATE ECE 2009
A transmission line terminates in two branches, each of length $$\lambda /4$$, as shown.The branches are terminated by 50 $$\Omega$$ loads. The lines...
GATE ECE 2008
One end of loss-less transmission line having the characteristic impedance of 75 $$\Omega$$ and length of 1 cm is short-ciruited. At 3 GHz, the input...
GATE ECE 2007
A load of 50 $$\Omega$$ is connected in shunt in a 2-wire transmission line of $$Z_0$$ = 50 $$\Omega$$ as shown in the Fig. The 2-port scattering pa...
GATE ECE 2007
The parallel branches of a 2-wire transmission line are terminated in 100 $$\Omega$$ and 200 $$\Omega$$ resistors as shown in the Fig. The character...
GATE ECE 2005

## Marks 10

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