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1001
GATE ECE 2004 | Question: 84
A source produces binary data at the rate of $\text{10 kbps.}$ The binary symbols are represented as shown in the figure given below. The source output is transmitted using two modulation schemes, namely Bìnary PSK (BPSK) and Quadrature PSK (QPSK). Let $\mathrm{B}_{1}$ ... $\mathrm{B}_{1}=20 \; \mathrm{kHz}, \mathrm{B}_{2}=10 \; \mathrm{kHz}$
A source produces binary data at the rate of $\text{10 kbps.}$ The binary symbols are represented as shown in the figure given below.The source output is transmitted usin...
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46.4k
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28
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Sep 25, 2022
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1002
GATE ECE 2004 | Question: 85
Consider a $300 \; \Omega$, quarter-wave long (at $1 \; \mathrm{GHz}$ ) transmission line as shown in the figure. It is connected to a $10 \mathrm{~V}, 50 \; \Omega$ source at one end and is left open circuited at the other end. The magnitude of the voltage at the open circuit end of the line is $10 \mathrm{~V}$ $5 \mathrm{~V}$ $60 \mathrm{~V}$ $60 / 7 \mathrm{~V}$
Consider a $300 \; \Omega$, quarter-wave long (at $1 \; \mathrm{GHz}$ ) transmission line as shown in the figure. It is connected to a $10 \mathrm{~V}, 50 \; \Omega$ sour...
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46.4k
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27
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Sep 25, 2022
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1003
GATE ECE 2004 | Question: 86
In a microwave test bench, why is the microwave signal amplitude modulated at $1 \; \mathrm{kHz}$? To increase the sensitivity of measurement To transmit the signal to a far-off place To study amplitude modulation Because crystal detector fails at microwave frequencies
In a microwave test bench, why is the microwave signal amplitude modulated at $1 \; \mathrm{kHz}$?To increase the sensitivity of measurementTo transmit the signal to a fa...
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46.4k
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31
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Sep 25, 2022
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1004
GATE ECE 2004 | Question: 87
If $\overrightarrow{\mathrm{E}}=\left(\hat{a}_{x}+j \vec{a}_{y}\right) e^{\beta a-k a t}$ and $\overrightarrow{\mathrm{H}}=\left(\frac{k}{\omega \mu}\right)\left(\hat{a}_{y}+j \hat{a}_{x}\right) e^{j u-\mu \mu 1}$, the time averaged Poynting vector is null ... $\left(\frac{2 k}{\omega \mu}\right) \hat{a}_{x}$ $\left(\frac{k}{2 \omega \mu}\right) \hat{a}_{z}$
If $\overrightarrow{\mathrm{E}}=\left(\hat{a}_{x}+j \vec{a}_{y}\right) e^{\beta a-k a t}$ and $\overrightarrow{\mathrm{H}}=\left(\frac{k}{\omega \mu}\right)\left(\hat{a}_...
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46.4k
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68
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Sep 25, 2022
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1005
GATE ECE 2004 | Question: 88
Consider an impedance $\mathrm{Z = R + j X }$ marked with point $\mathrm{P}$ in an impedance Smith chart as shown in the figure. The movement from point $\mathrm{P}$ ... series with $\mathrm{Z}$ adding an inductance in shunt across $\mathrm{Z}$ adding a capacitance in shunt across $\mathrm{Z}$
Consider an impedance $\mathrm{Z = R + j X }$ marked with point $\mathrm{P}$ in an impedance Smith chart as shown in the figure. The movement from point $\mathrm{P}$ alon...
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46.4k
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42
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Sep 25, 2022
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1006
GATE ECE 2004 | Question: 89
A plane electromagnetic wave propagating in free space in incident normally on a large slab of loss-less, non magnetic, dielectric material with $\varepsilon>\varepsilon_{0}$. Maxima and minima are observed when the electric field is measured in front of the slab. The maximum electric ... $60 \; \pi \Omega$ $600 \; \pi \Omega$ $24 \; \pi \Omega$
A plane electromagnetic wave propagating in free space in incident normally on a large slab of loss-less, non magnetic, dielectric material with $\varepsilon>\varepsilon_...
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46.4k
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237
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Sep 25, 2022
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1007
GATE ECE 2004 | Question: 90
A lossless transmission line is terminated in a load which reflects a part of the incident power. The measured VSWR is $2.$ The percentage of the power that is reflected back is $57.73$ $33.33$ $0.11$ $11.11$
A lossless transmission line is terminated in a load which reflects a part of the incident power. The measured VSWR is $2.$ The percentage of the power that is reflected ...
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46.4k
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52
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Sep 25, 2022
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1008
GATE ECE 1995 | Question 3.8
(A) $\text{AM}$ system (B) $\text{DSB-SC}$ system (C) $\text{PAM}$ system Coherent detection Envelope detection Correlation detection $\text{PLL}$ $\text{LPF}$
(A) $\text{AM}$ system(B) $\text{DSB-SC}$ system(C) $\text{PAM}$ systemCoherent detectionEnvelope detectionCorrelation detection$\text{PLL}$$\text{LPF}$
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Sep 23, 2022
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1009
GATE ECE 2005 | Question: 1
The following differential equation has \[3 \frac{d^{2} y}{d t^{2}}+4\left(\frac{d y}{d t}\right)^{3}+y^{2}+2=x\] degree $=2$, order $=1$ degree $=3$, order $=2$ degree $=4$, order $=3$ degree $=2$, order $=3$
The following differential equation has\[3 \frac{d^{2} y}{d t^{2}}+4\left(\frac{d y}{d t}\right)^{3}+y^{2}+2=x\]degree $=2$, order $=1$degree $=3$, order $=2$degree $=4$,...
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Sep 22, 2022
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1010
GATE ECE 2005 | Question: 2
Choose the function $f(t); – \infty < 1 < \infty,$ for which a Fourier series cannot be defined. $3 \sin (25 t)$ $4 \cos (20 t+3)+2 \sin (710 t)$ $\exp (-|t|) \sin (25 t)$ $1$
Choose the function $f(t); – \infty < 1 < \infty,$ for which a Fourier series cannot be defined.$3 \sin (25 t)$$4 \cos (20 t+3)+2 \sin (710 t)$$\exp (-|t|) \sin (25 t)$...
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110
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Sep 22, 2022
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1011
GATE ECE 2005 | Question: 3
A fair dice is rolled twice. The probability that an odd number will follow an even number is $\frac{1}{2}$ $\frac{1}{6}$ $\frac{1}{3}$ $\frac{1}{4}$
A fair dice is rolled twice. The probability that an odd number will follow an even number is$\frac{1}{2}$$\frac{1}{6}$$\frac{1}{3}$$\frac{1}{4}$
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Sep 22, 2022
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1012
GATE ECE 2005 | Question: 4
A solution of the following differential equation is given by \[\frac{d^{2} y}{d x^{2}}-5 \frac{d y}{d x}+6 y=0\] $y=e^{2 x}+e^{-3 x}$ $y=e^{2 x}+e^{3 x}$ $y=e^{-2 x}+e^{3 x}$ $y=e^{-2 x}+e^{-3 x}$
A solution of the following differential equation is given by\[\frac{d^{2} y}{d x^{2}}-5 \frac{d y}{d x}+6 y=0\]$y=e^{2 x}+e^{-3 x}$$y=e^{2 x}+e^{3 x}$$y=e^{-2 x}+e^{3 x}...
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Sep 22, 2022
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1013
GATE ECE 2005 | Question: 5
The function $x(t)$ is shown in the figure. Even and odd parts of a unit-step function $u(t)$ are respectively, $\frac{1}{2}, \frac{1}{2} x(t)$ $-\frac{1}{2}, \frac{1}{2} x(t)$ $\frac{1}{2},-\frac{1}{2} x(t)$ $-\frac{1}{2},-\frac{1}{2} x(t)$
The function $x(t)$ is shown in the figure. Even and odd parts of a unit-step function $u(t)$ are respectively,$\frac{1}{2}, \frac{1}{2} x(t)$$-\frac{1}{2}, \frac{1}{2} x...
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1014
GATE ECE 2005 | Question: 6
The region of convergence of $Z$-transform of the sequence $\left(\frac{5}{6}\right)^{n} u(n)-\left(\frac{6}{5}\right)^{n} u(-n-1)$ must be $|z|<\frac{5}{6}$ $|z|>\frac{6}{5}$ $\frac{5}{6}<|z|<\frac{6}{5}$ $\frac{6}{5}<|z|<\infty$
The region of convergence of $Z$-transform of the sequence$\left(\frac{5}{6}\right)^{n} u(n)-\left(\frac{6}{5}\right)^{n} u(-n-1)$ must be$|z|<\frac{5}{6}$$|z|>\frac{6}{5...
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1015
GATE ECE 2005 | Question: 7
The condition on $\mathrm{R}, \mathrm{L}$ and $\mathrm{C}$ such that the step response $y(t)$ in the figure has no oscillations, is $\mathrm{R} \geq \frac{1}{2} \sqrt{\frac{\mathrm{L}}{\mathrm{C}}}$ $\mathrm{R} \geq \sqrt{\frac{\mathrm{L}}{\mathrm{C}}}$ $\mathrm{R} \geq 2 \sqrt{\frac{\mathrm{L}}{\mathrm{C}}}$ $ \mathrm{R}=\frac{1}{\sqrt{\mathrm{LC}}}$
The condition on $\mathrm{R}, \mathrm{L}$ and $\mathrm{C}$ such that the step response $y(t)$ in the figure has no oscillations, is$\mathrm{R} \geq \frac{1}{2} \sqrt{\fra...
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1016
GATE ECE 2005 | Question: 8
The $\text{ABCD}$ parameters of an ideal $n: 1$ transformer shown in the figure are $\left[\begin{array}{ll}n & 0 \\ 0 & \mathrm{X}\end{array}\right]$. The value of $X$ will be $n$ $\frac{1}{n}$ $n^{2}$ $\frac{1}{n^{2}}$
The $\text{ABCD}$ parameters of an ideal $n: 1$ transformer shown in the figure are $\left[\begin{array}{ll}n & 0 \\ 0 & \mathrm{X}\end{array}\right]$. The value of $X$ w...
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1017
GATE ECE 2005 | Question: 9
In a series $\mathrm{RLC}$ circuit, $\mathrm{R}=2 \; \mathrm{k} \Omega, \mathrm{L}=1 \; \mathrm{H}$, and $\mathrm{C} \frac{1}{400}=\mu \mathrm{F}$. The resonant frequency is $2 \times 10^{4} \mathrm{~Hz}$ $\frac{1}{\pi} \times 10^{4} \mathrm{~Hz}$ $10^{4} \mathrm{~Hz}$ $2 \pi \times 10^{4} \mathrm{~Hz}$
In a series $\mathrm{RLC}$ circuit, $\mathrm{R}=2 \; \mathrm{k} \Omega, \mathrm{L}=1 \; \mathrm{H}$, and $\mathrm{C} \frac{1}{400}=\mu \mathrm{F}$. The resonant frequency...
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Sep 22, 2022
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1018
GATE ECE 2005 | Question: 10
The maximum power that can be transferred to the load resistor $R_{L}$ from the voltage source in the figure is $1 \mathrm{~W}$ $10 \mathrm{~W}$ $0.25 \mathrm{~W}$ $0.5 \mathrm{~W}$
The maximum power that can be transferred to the load resistor $R_{L}$ from the voltage source in the figure is$1 \mathrm{~W}$$10 \mathrm{~W}$$0.25 \mathrm{~W}$$0.5 \math...
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1019
GATE ECE 2005 | Question: 11
The bandgap of Silicon at room temperature is $1.3 \; \mathrm{eV}$ $0.7 \; \mathrm{eV}$ $1.1 \; \mathrm{eV}$ $1.4 \; \mathrm{eV}$
The bandgap of Silicon at room temperature is$1.3 \; \mathrm{eV}$$0.7 \; \mathrm{eV}$$1.1 \; \mathrm{eV}$$1.4 \; \mathrm{eV}$
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1020
GATE ECE 2005 | Question: 12
A Silicon PN junction at a temperature of $20^{\circ} \mathrm{C}$ has a reverse saturation current of $10$ picoAmperes $(\mathrm{pA})$. The reverse saturation current at $40^{\circ} \mathrm{C}$ for the same bias is approximately $30 \; \mathrm{pA}$. $40 \; \mathrm{pA}$. $50 \; \mathrm{pA}$ $60 \; \mathrm{pA}$.
A Silicon PN junction at a temperature of $20^{\circ} \mathrm{C}$ has a reverse saturation current of $10$ picoAmperes $(\mathrm{pA})$. The reverse saturation current at ...
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1021
GATE ECE 2005 | Question: 13
The primary reason for the widespread use of Silicon in semiconductor device technology is aboundance of Silicon on the surface of the Earth. larger bandgap of Silicon in comparison to Germanium. favorable properties of Silicon-dioxide $\left(\mathrm{SiO}_{2}\right)$. lower melting point.
The primary reason for the widespread use of Silicon in semiconductor device technology isaboundance of Silicon on the surface of the Earth.larger bandgap of Silicon in c...
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46.4k
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Sep 22, 2022
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1022
GATE ECE 2005 | Question: 14
The effect of current shunt feedback in an amplifier is to increase the input resistance and decrease the output resistance. increase both input and output resistances. decrease both input and output resistances. decrease the input resistance and increase the output resistance.
The effect of current shunt feedback in an amplifier is toincrease the input resistance and decrease the output resistance.increase both input and output resistances.decr...
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46.4k
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90
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1023
GATE ECE 2005 | Question: 15
The input resistance $\text{R}_{\mathrm{i}}$ of the amplifier shown in the figure is $\frac{30}{4} \; \mathrm{k} \Omega$ $10 \; \mathrm{k} \Omega$ $40 \; \mathrm{k} \Omega$ infiinte
The input resistance $\text{R}_{\mathrm{i}}$ of the amplifier shown in the figure is$\frac{30}{4} \; \mathrm{k} \Omega$$10 \; \mathrm{k} \Omega$$40 \; \mathrm{k} \Omega$i...
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46.4k
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150
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Sep 22, 2022
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1024
GATE ECE 2005 | Question: 16
The first and the last critical frequency of an $\text{RC}$-driving point impedance function must respectively be a zero and a pole a zero and a zero a pole and a pole a pole and a zero
The first and the last critical frequency of an $\text{RC}$-driving point impedance function must respectively bea zero and a polea zero and a zeroa pole and a polea pole...
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1025
GATE ECE 2005 | Question: 17
The cascode amplifier is a multistage configuration of $\mathrm{CC}-\mathrm{CB}$ $\mathrm{CE}-\mathrm{CB}$ $\mathrm{CB}-\mathrm{CC}$ $\mathrm{CE}-\mathrm{CC}$
The cascode amplifier is a multistage configuration of$\mathrm{CC}-\mathrm{CB}$$\mathrm{CE}-\mathrm{CB}$$\mathrm{CB}-\mathrm{CC}$$\mathrm{CE}-\mathrm{CC}$
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1026
GATE ECE 2005 | Question: 18
Decimal $43$ in Hexadecimal and $\text{BCD}$ number system is respectively $\text{B2, 01000011}$ $\text{2B, 01000011}$ $\text{2B, 00110100}$ $\text{B2, 0100 0100}$
Decimal $43$ in Hexadecimal and $\text{BCD}$ number system is respectively$\text{B2, 01000011}$$\text{2B, 01000011}$$\text{2B, 00110100}$$\text{B2, 0100 0100}$
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1027
GATE ECE 2005 | Question: 19
The Boolean function $f$ implemented in the figure using two input multiplexers is $\mathrm{A} \overline{\mathrm{B}} \text{C}+\mathrm{A} \overline{\mathrm{B}} \overline{\mathrm{C}}$ $\mathrm{ABC}+\mathrm{A} \overline{\mathrm{B}} \overline{\mathrm{C}}$ ... $\overline{\mathrm{A}} \overline{\mathrm{B}} \mathrm{C}+\overline{\mathrm{A}} \mathrm{B} \overline{\mathrm{C}}$
The Boolean function $f$ implemented in the figure using two input multiplexers is$\mathrm{A} \overline{\mathrm{B}} \text{C}+\mathrm{A} \overline{\mathrm{B}} \overline{\m...
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1028
GATE ECE 2005 | Question: 20
Which of the following can be impulse response of a casual system?
Which of the following can be impulse response of a casual system?
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1029
GATE ECE 2005 | Question: 21
Let $x(n)=\left(\frac{1}{2}\right)^{n} u(n), y(n)=x^{2}(n)$ and $\mathrm{Y}\left(e^{j i e}\right)$ be the Fourier transform of $y(n)$. Then $Y\left(e^{j i e}\right)$ is $\frac{1}{4}$ $2$ $4$ $\frac{4}{3}$
Let $x(n)=\left(\frac{1}{2}\right)^{n} u(n), y(n)=x^{2}(n)$ and $\mathrm{Y}\left(e^{j i e}\right)$ be the Fourier transform of $y(n)$. Then $Y\left(e^{j i e}\right)$ is$\...
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1030
GATE ECE 2005 | Question: 22
Find the correct match between group $1$ and group $2.$ ... $\text{P - X, Q - W, R - Z, S - Y,}$ $\text{P - Y, Q - Z, R - W, S - X,}$
Find the correct match between group $1$ and group $2.$Group I$\begin{array}{l}\mathrm{P}-\{1+k m(t)\} \mathrm{A} \sin \left(\omega_{c} t\right) \\\mathrm{Q}-k m(t) \math...
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1031
GATE ECE 2005 | Question: 23
The power in the signal $s(t)=8 \cos \left(20 \pi t-\frac{\pi}{2}\right)+$ $4 \sin (15 \pi t)$ is $40$ $41$ $42$ $82$
The power in the signal $s(t)=8 \cos \left(20 \pi t-\frac{\pi}{2}\right)+$ $4 \sin (15 \pi t)$ is$40$$41$$42$$82$
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1032
GATE ECE 2005 | Question: 24
Which of the following analog modulation scheme requires the minimum transmitted power and minimum channel bandwidth? VSB DSB-SC SSB AM
Which of the following analog modulation scheme requires the minimum transmitted power and minimum channel bandwidth?VSBDSB-SCSSBAM
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1033
GATE ECE 2005 | Question: 25
A linear system is equivalently represented by two sets of state equations. \[\dot{X}=\mathrm{AX}+\mathrm{BU} \text { and } \dot{W}=\mathrm{CW}+\mathrm{DU} \text {. }\] The eigenvalues of the representations are also computed as $\{\lambda\}$ and $\{\mu\}$. Which one of the ... $X \neq W$ $[\lambda] \neq[\mu]$ and $X=W$ $[\lambda] \neq[\mu]$ and $X \neq W$
A linear system is equivalently represented by two sets of state equations.\[\dot{X}=\mathrm{AX}+\mathrm{BU} \text { and } \dot{W}=\mathrm{CW}+\mathrm{DU} \text {. }\]The...
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1034
GATE ECE 2005 | Question: 26
Which one of the following polar diagrams corresponds to a lag network?
Which one of the following polar diagrams corresponds to a lag network?
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1035
GATE ECE 2005 | Question: 27
Despite the presence of negative feedback, control systems still have problems of instability because the components used have nonlinearities. dynamic equations of the subsystems are not known exactly. mathematical analysis involves approximations. system has large negative phase angle at high frequencies.
Despite the presence of negative feedback, control systems still have problems of instability because thecomponents used have nonlinearities.dynamic equations of the subs...
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1036
GATE ECE 2005 | Question: 28
The magnetic field intensity vector of a plane wave is given by $\overline{\mathrm{H}}(x, y, z, t)=10 \sin \left(50000 t+0.004 x+30 \; \hat{a}_{y}\right)$, where $\hat{a}_{y}$ denotes the unit vector in $y$ ... $-1.25 \times 10^{7} \mathrm{~m} / \mathrm{s}$. $3 \times 10^{8} \mathrm{~m} / \mathrm{s}$.
The magnetic field intensity vector of a plane wave is given by$\overline{\mathrm{H}}(x, y, z, t)=10 \sin \left(50000 t+0.004 x+30 \; \hat{a}_{y}\right)$,where $\hat{a}_{...
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1037
GATE ECE 2005 | Question: 29
Many circles are drawn in a Smith chart used for transmission line calculations. The circles shown in the figure represent unit circles. constant resistance circles. constant reactance circles. constant reflection coefficient circles.
Many circles are drawn in a Smith chart used for transmission line calculations. The circles shown in the figure representunit circles.constant resistance circles.constan...
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1038
GATE ECE 2005 | Question: 30
Refractive index of glass is $1.5.$ Find the wavelength of a beam of light with a frequency of $10^{14} \mathrm{~Hz}$ in glass. Assume velocity of light is $3 \times 10^{8} \mathrm{~m} / \mathrm{s}$ in vacuum. $3 \; \mu \mathrm{m}$ $3 \mathrm{~mm}$ $2 \; \mu \mathrm{m}$ $1 \; \mu \mathrm{m}$
Refractive index of glass is $1.5.$ Find the wavelength of a beam of light with a frequency of $10^{14} \mathrm{~Hz}$ in glass. Assume velocity of light is $3 \times 10^{...
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1039
GATE ECE 2005 | Question: 31
In what range should $\operatorname{Re}(s)$ remain so that the Laplace transform of the function $e^{(n+2)t+5}$ exits? $\operatorname{Re}(s)>a+2$ $\operatorname{Re}(\mathrm{s})>a+7$ $\operatorname{Re}(s)<2$ $\operatorname{Re}(s)>a+5$
In what range should $\operatorname{Re}(s)$ remain so that the Laplace transform of the function $e^{(n+2)t+5}$ exits?$\operatorname{Re}(s)>a+2$$\operatorname{Re}(\mathrm...
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1040
GATE ECE 2005 | Question: 32
Given the matrix $\left[\begin{array}{cc}-4 & 2 \\ 4 & 3\end{array}\right]$, the eigenvector is $\left[\begin{array}{l}3 \\ 2\end{array}\right]$ $\left[\begin{array}{l}4 \\ 3\end{array}\right]$ $\left[\begin{array}{c}2 \\ -1\end{array}\right]$ $\left[\begin{array}{c}-2 \\ 1\end{array}\right]$
Given the matrix $\left[\begin{array}{cc}-4 & 2 \\ 4 & 3\end{array}\right]$, the eigenvector is$\left[\begin{array}{l}3 \\ 2\end{array}\right]$$\left[\begin{array}{l}4 \\...
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