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Recent questions tagged impedance
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1
GATE ECE 2020  Question: 13
The impedances $Z=jX,$ for all $X$ in the range $\left ( \infty ,\infty \right )$, map to the Smith chart as a circle of radius $1$ with centre at $(0, 0)$. a point at the centre of the chart. a line passing through the centre of the chart. a circle of radius $0.5$ with centre at $(0.5, 0)$.
asked
Feb 13, 2020
in
Electromagnetics
by
jothee
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1.8k
points)

35
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gate2020ec
impedance
electromagnetics
0
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0
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2
GATE ECE 2020  Question: 21
A transmission line of length $3\lambda /4$ and having a characteristic impedance of $50$ $\Omega$ is terminated with a load of $400 \Omega$. The impedance (rounded off to two decimal places) seen at the input end of the transmission line is __________ $\Omega$.
asked
Feb 13, 2020
in
Electromagnetics
by
jothee
(
1.8k
points)

28
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gate2020ec
numericalanswers
impedance
electromagnetics
0
votes
0
answers
3
GATE ECE 2020  Question: 46
For a $2$port network consisting of an ideal lossless transformer, the parameter $S_{21}$ (rounded off to two decimal places) for a reference impedance of $10 \Omega$, is __________.
asked
Feb 13, 2020
in
Electromagnetics
by
jothee
(
1.8k
points)

14
views
gate2020ec
numericalanswers
impedance
electromagnetics
0
votes
0
answers
4
GATE ECE 2016 Set 1  Question: 25
The propagation constant of a lossy transmission line is $(2+j5) m^{1}$ and its characteristic impedance is $(50+j0) \Omega$ at $\omega = 10^6 rad \: s^{1}$ ... $L = 250 \: \mu H/m, C = 0.2 \: \mu F/m, R=50 \: \Omega /m, \: G=0.04 \: S/m$
asked
Mar 28, 2018
in
Electromagnetics
by
Milicevic3306
(
15.8k
points)

28
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gate2016ec1
impedance
electromagnetics
0
votes
0
answers
5
GATE ECE 2016 Set 1  Question: 31
A network consisting of a finite number of linear resistor (R), inductor (L), and capacitor (C) elements, connected all in series or all in parallel, is excited with a source of the form ... $\sum_{k=1}^{3} a_k\cos(k\omega_0t+\phi_k) \\$ $\sum_{k=1}^{2} a_k\cos(k\omega_0t+\phi_k)$
asked
Mar 28, 2018
in
Analog Circuits
by
Milicevic3306
(
15.8k
points)

23
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gate2016ec1
analogcircuits
impedance
0
votes
0
answers
6
GATE ECE 2015 Set 3  Question: 53
Consider the $3\:m$ long lossless airfilled transmission line shown in the figure. It has a characteristic impedance of $120\pi\: \Omega,$ is terminated by a short circuit, and is excited with a frequency of $37.5\: MHz.$ What is the nature of the input impedance $(Z_{in})?$ Open Short Inductive Capacitive
asked
Mar 28, 2018
in
Electromagnetics
by
Milicevic3306
(
15.8k
points)

17
views
gate2015ec3
electromagnetics
impedance
0
votes
0
answers
7
GATE ECE 2014 Set 4  Question: 11
If the emitter resistance in a commonemitter voltage amplifier is not bypassed, it will reduce both the voltage gain and the input impedance reduce the voltage gain and increase the input impedance increase the voltage gain and reduce the input impedance reduce both the voltage gain and the input impedance
asked
Mar 26, 2018
in
Electromagnetics
by
Milicevic3306
(
15.8k
points)

10
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gate2014ec4
electromagnetics
impedance
0
votes
0
answers
8
GATE ECE 2014 Set 4  Question: 24
For an antenna radiating in free space, the electric field at a distance of $1$ km is found to be $12 \: mV/m$. Given that intrinsic impedance of the free space is $120 \pi \: \Omega$, the magnitude of average power density due to this antenna at a distance of $2$ km from the antenna (in $nW/m^2$) is _________.
asked
Mar 26, 2018
in
Electromagnetics
by
Milicevic3306
(
15.8k
points)

22
views
gate2014ec4
numericalanswers
electromagnetics
impedance
0
votes
0
answers
9
GATE ECE 2014 Set 4  Question: 33
For the twoport network shown in the figure, the impedance (Z) matrix (in $\Omega$) is $\begin{bmatrix} 6 & 24 \\ 42 & 9 \end{bmatrix}$ $\begin{bmatrix} 9 & 8 \\ 8 & 24 \end{bmatrix}$ $\begin{bmatrix} 9 & 6 \\ 6 & 24 \end{bmatrix}$ $\begin{bmatrix} 42 & 6 \\ 6 & 60 \end{bmatrix}$
asked
Mar 26, 2018
in
Electromagnetics
by
Milicevic3306
(
15.8k
points)

7
views
gate2014ec4
electromagnetics
impedance
0
votes
0
answers
10
GATE ECE 2014 Set 3  Question: 25
In the following figure, the transmitter $Tx$ sends a wideband modulated $RF$ signal via a coaxial cable to the receiver $Rx$. The output impedance $Z_{T}$ of $Tx$, the characteristic impedance $Z_{0}$ of the cable and the input impedance ... $Z_{R}\neq Z_{0}$ Impedance mismatches do NOT result in signal distortion but reduce power transfer efficiency
asked
Mar 26, 2018
in
Electromagnetics
by
Milicevic3306
(
15.8k
points)

10
views
gate2014ec3
electromagnetics
impedance
0
votes
0
answers
11
GATE ECE 2014 Set 3  Question: 32
In the circuit shown in the figure, the angular frequency $\omega$ (in rad/s), at which the Norton equivalent impedance as seen from terminals $bb'$ is purely resistive, is ________.
asked
Mar 26, 2018
in
Electromagnetics
by
Milicevic3306
(
15.8k
points)

11
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gate2014ec3
numericalanswers
electromagnetics
impedance
0
votes
0
answers
12
GATE ECE 2014 Set 2  Question: 24
To maximum power transfer, a lossless transmission line is to be matched to a resistive load impedance via a $\lambda/4$ transformer as shown. The characteristic impedance (in $\Omega$) of the $\lambda$/4 transformer is ___________.
asked
Mar 26, 2018
in
Electromagnetics
by
Milicevic3306
(
15.8k
points)

16
views
gate2014ec2
numericalanswers
electromagnetics
impedance
0
votes
0
answers
13
GATE ECE 2014 Set 2  Question: 54
In the transmission line shown, the impedance $Z_{\text{in}}$ (in ohms) between node A and the ground is _________.
asked
Mar 26, 2018
in
Electromagnetics
by
Milicevic3306
(
15.8k
points)

16
views
gate2014ec2
numericalanswers
electromagnetics
impedance
0
votes
0
answers
14
GATE ECE 2014 Set 1  Question: 11
A good current buffer has low input impedance and low output impedance low input impedance and high output impedance high input impedance and low output impedance high input impedance and high output impedance
asked
Mar 26, 2018
in
Electromagnetics
by
Milicevic3306
(
15.8k
points)

19
views
gate2014ec1
electromagnetics
impedance
0
votes
0
answers
15
GATE ECE 2014 Set 1  Question: 54
For a parallel plate transmission line, let $v$ be the speed of propagation and $Z$ be the characteristic impedance. Neglecting fringe effects, a reduction of the spacing between the plates by a factor of two results in halving of $v$ and no change in $Z$ no changes in $v$ and halving of $Z$ no change in both $v$ and $Z$ halving of both $v$ and $Z$
asked
Mar 26, 2018
in
Electromagnetics
by
Milicevic3306
(
15.8k
points)

17
views
gate2014ec1
electromagnetics
impedance
0
votes
0
answers
16
GATE ECE 2014 Set 1  Question: 55
The input impedance of a $\dfrac{\lambda}{8}$ section of a lossless transmission line of characteristic impedance $50\: \Omega$ is found to be real when the other end is terminated by a load $Z_{L} (=R + jX)\Omega.$ If $X$ is $30\:\Omega ,$ the value of $R ( \text{in} \:\Omega )$ is _______.
asked
Mar 26, 2018
in
Electromagnetics
by
Milicevic3306
(
15.8k
points)

18
views
gate2014ec1
numericalanswers
electromagnetics
impedance
0
votes
0
answers
17
GATE ECE 2013  Question: 23
A source $v_{s}(t) = V\cos100\:\pi t$ has an internal impedance of $(4 + j3)\:\Omega.$ If a purely resistive load connected to this source has to extract the maximum power out of the source, its value in $\Omega$ should be $3$ $4$ $5$ $7$
asked
Mar 26, 2018
in
Electromagnetics
by
Milicevic3306
(
15.8k
points)

18
views
gate2013ec
impedance
electromagnetics
0
votes
0
answers
18
GATE ECE 2013  Question: 15
In a voltagevoltage feedback as shown below, which one of the following statements is TRUE if the gain $k$ is increased? The input impedance increases and output impedance decreases The input impedance increases and output ... also increases The input impedance decreases and output impedance also decreases The input impedance decreases and output impedance increases
asked
Mar 26, 2018
in
Electromagnetics
by
Milicevic3306
(
15.8k
points)

18
views
gate2013ec
impedance
electromagnetics
0
votes
0
answers
19
GATE ECE 2012  Question: 21
The impedance looking into nodes $1$ and $2$ in the given circuit is $50\:\Omega$ $100\:\Omega$ $5\:k\Omega$ $10.1\:k\Omega$
asked
Mar 25, 2018
in
Electromagnetics
by
Milicevic3306
(
15.8k
points)

17
views
gate2012ec
electromagnetics
impedance
0
votes
0
answers
20
GATE ECE 2012  Question: 16
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 $\mu_0=4\pi\times10^{7}\:H/m$, $\varepsilon_0=\frac{10^{9}}{36\pi}\:F/m$, the characteristic impedance of the cable is $330\:\Omega$ $100\:\Omega$ $143.3\:\Omega$ $43.4\:\Omega$
asked
Mar 25, 2018
in
Electromagnetics
by
Milicevic3306
(
15.8k
points)

14
views
gate2012ec
electromagnetics
impedance
0
votes
0
answers
21
GATE ECE 2012  Question: 10
The average power delivered to an impedance $(4j3)\:\Omega$ by a current $5\cos(100\pi t+100)\:A$ is $44.2\:W$ $50\:W$ $62.5\:W$ $125\:W$
asked
Mar 25, 2018
in
Electromagnetics
by
Milicevic3306
(
15.8k
points)

11
views
gate2012ec
electromagnetics
impedance
0
votes
0
answers
22
GATE ECE 2018  Question: 21
A lossy transmission line has resistance per unit length $R=0.05\:\Omega/m.$ The line is distortionless and has characteristic impedance of $50\:\Omega.$ The attenuation constant (in $\text{Np/m}$, correct to three decimal places) of the line is ________.
asked
Feb 19, 2018
in
Electromagnetics
by
gatecse
(
1.5k
points)

37
views
gate2018ec
numericalanswers
impedance
electromagnetics
0
votes
0
answers
23
GATE ECE 2018  Question: 10
The points $\text{P, Q, and R}$ shown on the Smith chart (normalized impedance chart) in the following figure represent: $\text{P: Open Circuit, Q: Short Circuit, R: Matched Load}$ $\text{P: Open Circuit, Q: Matched Load, R: Short Circuit}$ $\text{P: Short Circuit, Q: Matched Load, R: Open Circuit}$ $\text{P: Short Circuit, Q: Open Circuit, R: Matched Load}$
asked
Feb 19, 2018
in
Electromagnetics
by
gatecse
(
1.5k
points)

36
views
gate2018ec
electromagnetics
impedance
0
votes
0
answers
24
GATE ECE 2018  Question: 3
A good transimpedance amplifier has low input impedance and high output impedance high input impedance and high output impedance high input impedance and low output impedance low input impedance and low output impedance
asked
Feb 19, 2018
in
Electromagnetics
by
gatecse
(
1.5k
points)

34
views
gate2018ec
electromagnetics
impedance
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