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1401
GATE ECE 2007 | Question: 56
The asymptotic Bode plot of a transfer function is as shown in the figure. The transfer function $G(s)$ corresponding to this Bode plot is $\frac{1}{(s+1)(s+20)}$ $\frac{1}{s(s+1)(s+20)}$ $\frac{100}{s(s+1)(s+20)}$ $\frac{100}{s(s+1)(1+0.05 s)}$
The asymptotic Bode plot of a transfer function is as shown in the figure. The transfer function $G(s)$ corresponding to this Bode plot is$\frac{1}{(s+1)(s+20)}$$\frac{1}...
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1402
GATE ECE 2007 | Question: 57
The state space representation of a separately excited $\text{DC}$ servo motor dynamics is given as \[\left[\begin{array}{l} \dfrac{d \omega}{d t} \\ \dfrac{d i_{a}}{d t} \end{array}\right]=\left[\begin{array}{rr} -1 & 1 \\ -1 & -10 \end{array}\right]\left[\begin{array}{l ... $\frac{1}{s^{2}+11 s+11}$ $\frac{10 s+10}{s^{2}+11 s+11}$ $\frac{1}{s^{2}+s+1}$
The state space representation of a separately excited $\text{DC}$ servo motor dynamics is given as\[\left[\begin{array}{l}\dfrac{d \omega}{d t} \\\dfrac{d i_{a}}{d t}\en...
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1403
GATE ECE 2007 | Question: 58
In delta modulation, the slope overload distortion can be reduced by decreasing the step size decreasing the granular noise decreasing the sampling rate increasing the step size
In delta modulation, the slope overload distortion can be reduced bydecreasing the step sizedecreasing the granular noisedecreasing the sampling rateincreasing the step s...
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1404
GATE ECE 2007 | Question: 59
The raised cosine pulse $p(t)$ is used for zero ISI in digital communications. The expression for $p(t)$ with unity roll-off factor is given by $p(t)=\dfrac{\sin 4 \pi W t}{4 \pi W t\left(1-16 W^{2} t^{2}\right)}$. The value of $p(t)$ at $t=\dfrac{1}{4 W}$ is $-0.5$ $0$ $0.5$ $\infty$
The raised cosine pulse $p(t)$ is used for zero ISI in digital communications. The expression for $p(t)$ with unity roll-off factor is given by $p(t)=\dfrac{\sin 4 \pi W ...
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1405
GATE ECE 2007 | Question: 60
In the following scheme, if the spectrum $M(f)$ of $m(t)$ is as shown, then the spectrum $Y(f)$ of $y(t)$ will be
In the following scheme, if the spectrum $M(f)$ of $m(t)$ is as shown, then the spectrum $Y(f)$ of $y(t)$ will be
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1406
GATE ECE 2007 | Question: 61
During transmission over a certain binary communication channel, bit errors occur independently with probability $p$. The probability of AT MOST one bit in error in a block of $n$ bits is given by $p^{n}$ $1-p^{n}$ $n p(1-p)^{n-1}+(1-p)^{n}$ $1-(1-p)^{n}$
During transmission over a certain binary communication channel, bit errors occur independently with probability $p$. The probability of AT MOST one bit in error in a blo...
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1407
GATE ECE 2007 | Question: 62
In a GSM system, $8$ channels can co-exist in $200 \; \mathrm{kHz}$ bandwidth using TDMA. A GSM based cellular operator is allocated $5 \; \mathrm{MHz}$ bandwidth. Assuming a frequency reuse factor of $\frac{1}{5}$, i.e. a five-cell repeat pattern, the maximum number of simultaneous channels that can exist in one cell is $200$ $40$ $25$ $5$
In a GSM system, $8$ channels can co-exist in $200 \; \mathrm{kHz}$ bandwidth using TDMA. A GSM based cellular operator is allocated $5 \; \mathrm{MHz}$ bandwidth. Assumi...
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1408
GATE ECE 2007 | Question: 63
In a Direct Sequence CDMA system the chip rate is $1.2288 \times 10^{6}$ chips per second. If the processing gain is desired to be AT LEAST $100,$ the data rate must be less than or equal to $12.288 \times 10^{3}$ ... exactly equal to $12.288 \times 10^{3}$ bits per sec can take any value less than $122.88 \times 10^{3}$ bits per sec
In a Direct Sequence CDMA system the chip rate is $1.2288 \times 10^{6}$ chips per second. If the processing gain is desired to be AT LEAST $100,$ the data ratemust be le...
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1409
GATE ECE 2007 | Question: 64
An air-filled rectangular waveguide has inner dimensions of $3 \mathrm{~cm} \times 2 \mathrm{~cm}$. The wave impedance of the $\mathrm{TE}_{20}$ mode of propagation in the waveguide at a frequency of $30 \; \mathrm{GHz}$ is (free space impedance $\eta_{0}=377 \; \Omega)$ $308 \; \Omega$ $355 \; \Omega$ $400 \; \Omega$ $461 \; \Omega$
An air-filled rectangular waveguide has inner dimensions of $3 \mathrm{~cm} \times 2 \mathrm{~cm}$. The wave impedance of the $\mathrm{TE}_{20}$ mode of propagation in th...
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1410
GATE ECE 2007 | Question: 65
The $\vec{H}$ field (in $\mathrm{A/m}$ ) of a plane wave propagating in free space is given by \[ \vec{H}=\hat{x} \frac{5 \sqrt{3}}{\eta_{0}} \cos (\omega t-\beta z)+\hat{y} \frac{5}{\eta_{0}} \sin \left(\omega t-\beta z+\frac{\pi}{2}\right) ... average power flow density in Watts is $\frac{\eta_{0}}{100}$ $\frac{100}{\eta_{0}}$ $50 \eta_{0}^{2}$ $\frac{50}{\eta_{0}}$
The $\vec{H}$ field (in $\mathrm{A/m}$ ) of a plane wave propagating in free space is given by\[ \vec{H}=\hat{x} \frac{5 \sqrt{3}}{\eta_{0}} \cos (\omega t-\beta z)+\hat{...
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1411
GATE ECE 2007 | Question: 66
The $\vec{E}$ field in a rectangular waveguide of inner dimensions $a \times b$ is given by \[ \vec{E}=\frac{\omega \mu}{h^{2}}\left(\frac{\pi}{a}\right) H_{0} \sin \left(\frac{2 \pi x}{a}\right) \sin (\omega t-\beta z) \hat{y}\] where ... respectively. The mode of propagation in the waveguide is $\mathrm{TE}_{20}$ $\mathrm{TM}_{11}$ $\mathrm{TM}_{20}$ $\text{TE}_{10}$
The $\vec{E}$ field in a rectangular waveguide of inner dimensions $a \times b$ is given by\[ \vec{E}=\frac{\omega \mu}{h^{2}}\left(\frac{\pi}{a}\right) H_{0} \sin \left(...
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1412
GATE ECE 2007 | Question: 67
A load of $50\; \Omega$ is connected in shunt in a $2$-wire transmission line of $Z_{0}=50 \;\Omega$ as shown in the figure. The $2$-port scattering parameter matrix $\text{(S-matrix)}$ ...
A load of $50\; \Omega$ is connected in shunt in a $2$-wire transmission line of $Z_{0}=50 \;\Omega$ as shown in the figure. The $2$-port scattering parameter matrix $\te...
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1413
GATE ECE 2007 | Question: 68
The parallel branches of a $2$-wire transmission line are terminated in $100 \; \Omega$ and $200 \; \Omega$ resistors as shown in the figure. The characteristic impedance of the line is $Z_{0}=50 \; \Omega$ and each section has a length of $\lambda / 4$. The voltage reflection ... $-j \frac{7}{5}$ $\frac{-5}{7}$ $j \frac{5}{7}$ $\frac{5}{7}$
The parallel branches of a $2$-wire transmission line are terminated in $100 \; \Omega$ and $200 \; \Omega$ resistors as shown in the figure. The characteristic impedance...
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1414
GATE ECE 2007 | Question: 69
A $\dfrac{\lambda}{2}$ dipole is kept horizontally at a height of $\dfrac{\lambda_{0}}{2}$ above a perfectly conducting infinite ground plane. The radiation pattern in the plane of the dipole ( $\vec{E}$ plane) looks approximately as
A $\dfrac{\lambda}{2}$ dipole is kept horizontally at a height of $\dfrac{\lambda_{0}}{2}$ above a perfectly conducting infinite ground plane. The radiation pattern in th...
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1415
GATE ECE 2007 | Question: 70
A right circularly polarized (RCP) plane wave is incident at an angle of $60^{\circ}$ to the normal, on an air-dielectric interface. If the reflected wave is linearly polarized, the relative dielectric constant $\varepsilon_{r 2}$ is $\sqrt{2}$ $\sqrt{3}$ $2$ $3$
A right circularly polarized (RCP) plane wave is incident at an angle of $60^{\circ}$ to the normal, on an air-dielectric interface. If the reflected wave is linearly pol...
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1416
GATE ECE 2007 | Question: 71
The figure shows the high-frequency capacitance-voltage (C-V) characteristics of a $\mathrm{Metal} / \mathrm{SiO}_{2} / \text{silicon (MOS)}$ capacitor having an area of $1 \times 10^{-4} \mathrm{~cm}^{2}$ ... is $50 \; \mathrm{~nm}$ $143 \; \mathrm{~nm}$ $350 \; \mathrm{~nm}$ $1 \; \mu \mathrm{m}$
The figure shows the high-frequency capacitance-voltage (C-V) characteristics of a $\mathrm{Metal} / \mathrm{SiO}_{2} / \text{silicon (MOS)}$ capacitor having an area of ...
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1417
GATE ECE 2007 | Question: 72
The figure shows the high-frequency capacitance-voltage (C-V) characteristics of a $\mathrm{Metal} / \mathrm{SiO}_{2} / \text{silicon (MOS)}$ capacitor having an area of $1 \times 10^{-4} \mathrm{~cm}^{2}$ ... $0.857 \; \mu \mathrm{m}$ $1 \; \mu \mathrm{m}$ $1.143 \; \mu \mathrm{m}$
The figure shows the high-frequency capacitance-voltage (C-V) characteristics of a $\mathrm{Metal} / \mathrm{SiO}_{2} / \text{silicon (MOS)}$ capacitor having an area of ...
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1418
GATE ECE 2007 | Question: 73
The figure shows the high-frequency capacitance-voltage (C-V) characteristics of a $\mathrm{Metal} / \mathrm{SiO}_{2} / \text{silicon (MOS)}$ capacitor having an area of $1 \times 10^{-4} \mathrm{~cm}^{2}$ ... is false $\mathrm{S} 1$ is false and $\mathrm{S} 2$ is true Both $\text{S1}$ and $\text{S2}$ are false
The figure shows the high-frequency capacitance-voltage (C-V) characteristics of a $\mathrm{Metal} / \mathrm{SiO}_{2} / \text{silicon (MOS)}$ capacitor having an area of ...
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1419
GATE ECE 2007 | Question: 74
Two $4$-ary signal constellations are shown. It is given that $\phi_{1}$ and $\phi_{2}$ constitute an orthonormal basis for the two constellations. Assume that the four symbols in both the constellations are equiprobable. Let $\frac{N_{0}}{2}$ denote the power ... average energy of Constellation $1$ to the average energy of Constellation $2$ is $4 a^{2}$ $4$ $2$ $8$
Two $4$-ary signal constellations are shown. It is given that $\phi_{1}$ and $\phi_{2}$ constitute an orthonormal basis for the two constellations. Assume that the four s...
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1420
GATE ECE 2007 | Question: 75
Two $4$-ary signal constellations are shown. It is given that $\phi_{1}$ and $\phi_{2}$ ... both the constellations The value of $N_{0}$ will determine which of the two constellations has a lower probability of symbol error
Two $4$-ary signal constellations are shown. It is given that $\phi_{1}$ and $\phi_{2}$ constitute an orthonormal basis for the two constellations. Assume that the four s...
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1421
GATE ECE 2007 | Question: 76
Consider the Op-Amp circuit shown in the figure. The transfer function $V_{o}(s) / V_{i}(s)$ is $\frac{1-s R C}{1+s R C}$ $\frac{1+s R C}{1-s R C}$ $\frac{1}{1-s R C}$ $\frac{1}{1+s R C}$
Consider the Op-Amp circuit shown in the figure.The transfer function $V_{o}(s) / V_{i}(s)$ is$\frac{1-s R C}{1+s R C}$$\frac{1+s R C}{1-s R C}$$\frac{1}{1-s R C}$$\frac{...
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1422
GATE ECE 2007 | Question: 77
Consider the Op-Amp circuit shown in the figure. If $V_{i}=V_{1} \sin (\omega t)$ and $V_{o}=V_{2} \sin (\omega t+\phi)$, then the minimum and maximum values of $\phi$ (in radians) are respectively $-\pi / 2$ and $\pi / 2$ $0$ and $\pi / 2$ $-\pi$ and $0$ $-\pi / 2$ and $0$
Consider the Op-Amp circuit shown in the figure.If $V_{i}=V_{1} \sin (\omega t)$ and $V_{o}=V_{2} \sin (\omega t+\phi)$, then the minimum and maximum values of $\phi$ (in...
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1423
GATE ECE 2007 | Question: 78
An $8085$ assembly language program is given below. Line 1: MVI A,B5H 2: MVI B0EH 3: XRI 69H 4: ADD B 5: ANI 9BH 6: CPI 9FH 7: STA 3010H 8: HLT The contents of the accumulator just after execution of the $\textsf{ADD}$ instruction in line $4$ will be $\text{C3H}$ $\text{EAH}$ $\mathrm{DCH}$ $69 \mathrm{H}$
An $8085$ assembly language program is given below.Line 1: MVI A,B5H 2: MVI B0EH 3: XRI 69H 4: ADD B 5: ANI 9BH 6: CPI 9FH 7: STA 3010H 8: HLTThe contents of the accumula...
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1424
GATE ECE 2007 | Question: 79
An $8085$ assembly language program is given below. Line 1: MVI A, B5H 2: MVI B, 0EH 3: XRI 69H 4: ADD B 5: ANI 9BH 6: CPI 9FH 7: STA 3010H 8: HLT After execution of line $7$ of the program, the status of the $\text{CY}$ and $\mathrm{Z}$ flags will be $\mathrm{CY}=0, \mathrm{Z}=0$ $\text{CY=0, Z=1}$ $\mathrm{CY}=1, \mathrm{Z}=0$ $\mathrm{CY}=1, \mathrm{Z}=1$
An $8085$ assembly language program is given below.Line 1: MVI A, B5H 2: MVI B, 0EH 3: XRI 69H 4: ADD B 5: ANI 9BH 6: CPI 9FH 7: STA 3010H 8: HLT After execution of line ...
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1425
GATE ECE 2007 | Question: 80
Consider a linear system whose state space representation is $\dot{\mathbf{x}}(t)=\mathbf{A} \mathbf{x}(t)$. If the initial state vector of the system is $\mathbf{x}(0)=\left[\begin{array}{r}1 \\ -2\end{array}\right]$ ... $\left(1,\left[\begin{array}{r}1 \\ -2\end{array}\right]\right)$
Consider a linear system whose state space representation is $\dot{\mathbf{x}}(t)=\mathbf{A} \mathbf{x}(t)$. If the initial state vector of the system is $\mathbf{x}(0)=\...
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1426
GATE ECE 2007 | Question: 81
Consider a linear system whose state space representation is $\dot{\mathbf{x}}(t)=\mathbf{A} \mathbf{x}(t)$. If the initial state vector of the system is $\mathbf{x}(0)=\left[\begin{array}{r}1 \\ -2\end{array}\right]$ ... $\left[\begin{array}{rr}0 & 1 \\ -2 & -3\end{array}\right]$
Consider a linear system whose state space representation is $\dot{\mathbf{x}}(t)=\mathbf{A} \mathbf{x}(t)$. If the initial state vector of the system is $\mathbf{x}(0)=\...
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1427
GATE ECE 2007 | Question: 82
An input to a $6$-level quantizer has the probability density function $f(x)$ as shown in the figure. Decision boundaries of the quantizer are chosen so as to maximize the entropy of the quantizer output. It is given that $3$ consecutive decision boundaries are $\text{ -1', 0'}$ ... $b=3 / 40$ $a=1 / 4$ and $b=1 / 16$ $a=1 / 3$ and $b=1 / 24$
An input to a $6$-level quantizer has the probability density function $f(x)$ as shown in the figure. Decision boundaries of the quantizer are chosen so as to maximize th...
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1428
GATE ECE 2007 | Question: 83
An input to a $6$-level quantizer has the probability density function $f(x)$ as shown in the figure. Decision boundaries of the quantizer are chosen so as to maximize the entropy of the quantizer output. It is given that $3$ ... of signal power to quantization noise power is $\frac{152}{9}$ $\frac{64}{3}$ $\frac{76}{3}$ $28$
An input to a $6$-level quantizer has the probability density function $f(x)$ as shown in the figure. Decision boundaries of the quantizer are chosen so as to maximize th...
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1429
GATE ECE 2007 | Question: 84
In the Digital-to-Analog converter circuit shown in the figure below, $V_{R}=10 \mathrm{~V}$ and $\mathrm{R}=10 \; \mathrm{k} \Omega$. The current $i$ is $31.25 \; \mu \mathrm{A}$ $62.5 \; \mu \mathrm{A}$ $125 \; \mu \mathrm{A}$ $250 \; \mu \mathrm{A}$
In the Digital-to-Analog converter circuit shown in the figure below, $V_{R}=10 \mathrm{~V}$ and $\mathrm{R}=10 \; \mathrm{k} \Omega$.The current $i$ is$31.25 \; \mu \mat...
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1430
GATE ECE 2007 | Question: 85
In the Digital-to-Analog converter circuit shown in the figure below, $V_{R}=10 \mathrm{~V}$ and $\mathrm{R}=10 \; \mathrm{k} \Omega$. The voltage $V_{o}$ is $-0.781 \mathrm{~V}$ $-1.562 \mathrm{~V}$ $-3.125 \mathrm{~V}$ $-6.250 \mathrm{~V}$
In the Digital-to-Analog converter circuit shown in the figure below, $V_{R}=10 \mathrm{~V}$ and $\mathrm{R}=10 \; \mathrm{k} \Omega$.The voltage $V_{o}$ is$-0.781 \mathr...
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1431
GATE ECE 1993 | Question 6.6
The built-in potential (Diffusion Potential) in a $p-n$ junction is equal to the difference in the Fermi level of the two sides, expressed in volts increases with the increase in the doping levels of the two sides increases with the increase in temperature is equal to the average of the Fermi levels of the two sides
The built-in potential (Diffusion Potential) in a $p-n$ junctionis equal to the difference in the Fermi level of the two sides, expressed in voltsincreases with the incre...
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1432
GATE ECE 2008 | Question: 1
All the four entries of the $2 \times 2$ matrix $\mathbf{P}=\left[\begin{array}{ll}p_{11} & p_{12} \\ p_{21} & p_{22}\end{array}\right]$ are nonzero, and one of its eigenvalues is zero. Which of the following statements is true? $p_{11} p_{22}-p_{12} p_{21}=1$ $p_{11} p_{22}-p_{12} p_{21}=-1$ $p_{11} p_{22}-p_{12} p_{21}=0$ $p_{11} p_{22}+p_{12} p_{21}=0$
All the four entries of the $2 \times 2$ matrix $\mathbf{P}=\left[\begin{array}{ll}p_{11} & p_{12} \\ p_{21} & p_{22}\end{array}\right]$ are nonzero, and one of its eigen...
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1433
GATE ECE 2008 | Question: 2
The system of linear equations \[ \begin{array}{l} 4 x+2 y=7 \\ 2 x+y=6 \end{array} \] has a unique solution no solution an infinite number of solutions exactly two distinct solutions
The system of linear equations\[ \begin{array}{l}4 x+2 y=7 \\2 x+y=6\end{array} \]hasa unique solutionno solutionan infinite number of solutionsexactly two distinct solut...
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1434
GATE ECE 2008 | Question: 3
The equation $\sin (z)=10$ has no real or complex solution exactly two distinct complex solutions a unique solution an infinite number of complex solutions
The equation $\sin (z)=10$ hasno real or complex solutionexactly two distinct complex solutionsa unique solutionan infinite number of complex solutions
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1435
GATE ECE 2008 | Question: 4
For real values of $x$, the minimum value of the function $f(x)=\exp (x)+\exp (-x)$ is $2$ $1$ $0.5$ $0$
For real values of $x$, the minimum value of the function $f(x)=\exp (x)+\exp (-x)$ is$2$$1$$0.5$$0$
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1436
GATE ECE 2008 | Question: 5
Which of the following functions would have only odd powers of $x$ in its Taylor series expansion about the point $x=0?$ $\sin \left(x^{3}\right)$ $\sin \left(x^{2}\right)$ $\cos \left(x^{3}\right)$ $\cos \left(x^{2}\right)$
Which of the following functions would have only odd powers of $x$ in its Taylor series expansion about the point $x=0?$ $\sin \left(x^{3}\right)$$\sin \left(x^{2}\right)...
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1437
GATE ECE 2008 | Question: 6
Which of the following is a solution to the differential equation $\dfrac{d x(t)}{d t}+3 x(t)=0?$ $x(t)=3 e^{-t}$ $x(t)=2 e^{-3 t}$ $x(t)=-\frac{3}{2} t^{2}$ $x(t)=3 t^{2}$
Which of the following is a solution to the differential equation $\dfrac{d x(t)}{d t}+3 x(t)=0?$ $x(t)=3 e^{-t}$$x(t)=2 e^{-3 t}$$x(t)=-\frac{3}{2} t^{2}$$x(t)=3 t^{2}$
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1438
GATE ECE 2008 | Question: 7
In the following graph, the number of trees $\text{(P)}$ and the number of cut-sets $\text{(Q)}$ are $\mathrm{P}=2, \mathrm{Q}=2$ $\mathrm{P}=2, \mathrm{Q}=6$ $\mathrm{P}=4, \mathrm{Q}=6$ $\mathrm{P}=4, \mathrm{Q}=10$
In the following graph, the number of trees $\text{(P)}$ and the number of cut-sets $\text{(Q)}$ are$\mathrm{P}=2, \mathrm{Q}=2$$\mathrm{P}=2, \mathrm{Q}=6$$\mathrm{P}=4,...
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1439
GATE ECE 2008 | Question: 8
In the following circuit, the switch $\mathrm{S}$ is closed at $t=0$. The rate of change of current $\dfrac{d i}{d t}(0+)$ is given by $0$ $\frac{R_{S} I_{S}}{L}$ $\frac{\left(R+R_{s}\right) I_{s}}{L}$ $\infty$
In the following circuit, the switch $\mathrm{S}$ is closed at $t=0$. The rate of change of current $\dfrac{d i}{d t}(0+)$ is given by$0$$\frac{R_{S} I_{S}}{L}$$\frac{\le...
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1440
GATE ECE 2008 | Question: 9
The input and output of a continuous time system are respectively denoted by $x(t)$ and $y(t)$. Which of the following descriptions corresponds to a causal system? $y(t)=x(t-2)+x(t+4)$ $y(t)=(t-4) x(t+1)$ $y(t)=(t+4) x(t-1)$ $y(t)=(t+5) x(t+5)$
The input and output of a continuous time system are respectively denoted by $x(t)$ and $y(t)$. Which of the following descriptions corresponds to a causal system?$y(t)=x...
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