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Recent questions tagged impedance
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1
GATE2020EC: 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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1.4k
points)
gate2020ec
impedance
electromagnetics
0
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0
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2
GATE2020EC: 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
(
1.4k
points)
gate2020ec
numericalanswers
impedance
electromagnetics
0
votes
0
answers
3
GATE2020EC: 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
(
1.4k
points)
gate2020ec
numericalanswers
impedance
electromagnetics
0
votes
0
answers
4
GATE2016125
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)
gate2016ec1
impedance
electromagnetics
0
votes
0
answers
5
GATE2016131
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 $\sum_{k=1}^{3} a_k\cos(k\omega_0t) ,\text{where } \thinspace a_k\neq 0, \omega_0\neq0$ The ... $\sum_{k=1}^{3} a_k\cos(k\omega_0t+\phi_k) \\$ $\sum_{k=1}^{2} a_k\cos(k\omega_0t+\phi_k)$
asked
Mar 28, 2018
in
Analog Circuits
by
Milicevic3306
(
15.8k
points)
gate2016ec1
analogcircuits
impedance
0
votes
0
answers
6
GATE2015353
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)
gate2015ec3
electromagnetics
impedance
0
votes
0
answers
7
GATE2014411
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)
gate2014ec4
electromagnetics
impedance
0
votes
0
answers
8
GATE2014424
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)
gate2014ec4
numericalanswers
electromagnetics
impedance
0
votes
0
answers
9
GATE2014433
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)
gate2014ec4
electromagnetics
impedance
0
votes
0
answers
10
GATE2014325
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 $Z_{R}$ ... $Z_{R}\neq Z_{0}$ Impedance mismatches do NOT result in signal distortion but reduce power transfer efficiency
asked
Mar 26, 2018
in
Electromagnetics
by
Milicevic3306
(
15.8k
points)
gate2014ec3
electromagnetics
impedance
0
votes
0
answers
11
GATE2014332
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)
gate2014ec3
numericalanswers
electromagnetics
impedance
0
votes
0
answers
12
GATE2014224
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)
gate2014ec2
numericalanswers
electromagnetics
impedance
0
votes
0
answers
13
GATE2014254
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)
gate2014ec2
numericalanswers
electromagnetics
impedance
0
votes
0
answers
14
GATE2014111
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)
gate2014ec1
electromagnetics
impedance
0
votes
0
answers
15
GATE2014154
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)
gate2014ec1
electromagnetics
impedance
0
votes
0
answers
16
GATE2014155
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)
gate2014ec1
numericalanswers
electromagnetics
impedance
0
votes
0
answers
17
GATE201323
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)
gate2013ec
impedance
electromagnetics
0
votes
0
answers
18
GATE201315
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 impedance 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)
gate2013ec
impedance
electromagnetics
0
votes
0
answers
19
GATE201221
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)
gate2012ec
electromagnetics
impedance
0
votes
0
answers
20
GATE201216
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)
gate2012ec
electromagnetics
impedance
0
votes
0
answers
21
GATE201210
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)
gate2012ec
electromagnetics
impedance
0
votes
0
answers
22
GATE201821
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)
gate2018ec
numericalanswers
impedance
electromagnetics
0
votes
0
answers
23
GATE201810
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)
gate2018ec
electromagnetics
impedance
0
votes
0
answers
24
GATE20183
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)
gate2018ec
electromagnetics
impedance
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