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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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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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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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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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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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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$$0$
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GATE ECE 2008 | Question: 5
Which of the following functions would have only odd powers of $x$ in its Taylor series expansion about the point $x=0?$ $\sin \left(x^{3}\right)$ $\sin \left(x^{2}\right)$ $\cos \left(x^{3}\right)$ $\cos \left(x^{2}\right)$
Which of the following functions would have only odd powers of $x$ in its Taylor series expansion about the point $x=0?$ $\sin \left(x^{3}\right)$$\sin \left(x^{2}\right)...
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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}$$x(t)=3 t^{2}$
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GATE ECE 2008 | Question: 7
In the following graph, the number of trees $\text{(P)}$ and the number of cut-sets $\text{(Q)}$ are $\mathrm{P}=2, \mathrm{Q}=2$ $\mathrm{P}=2, \mathrm{Q}=6$ $\mathrm{P}=4, \mathrm{Q}=6$ $\mathrm{P}=4, \mathrm{Q}=10$
In the following graph, the number of trees $\text{(P)}$ and the number of cut-sets $\text{(Q)}$ are$\mathrm{P}=2, \mathrm{Q}=2$$\mathrm{P}=2, \mathrm{Q}=6$$\mathrm{P}=4,...
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GATE ECE 2008 | Question: 8
In the following circuit, the switch $\mathrm{S}$ is closed at $t=0$. The rate of change of current $\dfrac{d i}{d t}(0+)$ is given by $0$ $\frac{R_{S} I_{S}}{L}$ $\frac{\left(R+R_{s}\right) I_{s}}{L}$ $\infty$
In the following circuit, the switch $\mathrm{S}$ is closed at $t=0$. The rate of change of current $\dfrac{d i}{d t}(0+)$ is given by$0$$\frac{R_{S} I_{S}}{L}$$\frac{\le...
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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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GATE ECE 2008 | Question: 10
The impulse response $h(t)$ of a linear time-invariant continuous time system is described by $h(t)=\exp (\alpha t) u(t)+\exp (\beta t) u(-t)$, where $u(t)$ denotes the unit step function, and $\alpha$ and $\beta$ are real constants. ... $\beta$ is negative $\alpha$ is positive and $\beta$ is negative $\alpha$ is negative and $\beta$ is positive
The impulse response $h(t)$ of a linear time-invariant continuous time system is described by $h(t)=\exp (\alpha t) u(t)+\exp (\beta t) u(-t)$, where $u(t)$ denotes the u...
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GATE ECE 2008 | Question: 11
The pole-zero plot given below corresponds to a Low pass filter High pass filter Band pass filter Notch filter
The pole-zero plot given below corresponds to aLow pass filterHigh pass filterBand pass filterNotch filter
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GATE ECE 2008 | Question: 12
Step responses of a set of three second-order underdamped systems all have the same percentage overshoot. Which of the following diagrams represents the poles of the three systems?
Step responses of a set of three second-order underdamped systems all have the same percentage overshoot. Which of the following diagrams represents the poles of the thre...
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GATE ECE 2008 | Question: 13
Which of the following is NOT associated with a $\text{p-n}$ junction? Junction Capacitance Charge Storage Capacitance Depletion Capacitance Channel Length Modulation
Which of the following is NOT associated with a $\text{p-n}$ junction?Junction CapacitanceCharge Storage CapacitanceDepletion CapacitanceChannel Length Modulation
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GATE ECE 2008 | Question: 14
Which of the following is true? A silicon wafer heavily doped with boron is a $p^{+}$substrate A silicon wafer lightly doped with boron is a $p^{+}$ substrate A silicon wafer heavily doped with arsenic is a $\mathrm{p}^{+}$substrate A silicon wafer lightly doped with arsenic is a $p^{+}$ substrate
Which of the following is true?A silicon wafer heavily doped with boron is a $p^{+}$substrateA silicon wafer lightly doped with boron is a $p^{+}$ substrateA silicon wafe...
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GATE ECE 2008 | Question: 15
For a Hertz dipole antenna, the half power beam width $\text{(HPBW)}$ in the $\text{E}$-plane is $360^{\circ}$ $180^{\circ}$ $90^{\circ}$ $45^{\circ}$
For a Hertz dipole antenna, the half power beam width $\text{(HPBW)}$ in the $\text{E}$-plane is$360^{\circ}$$180^{\circ}$$90^{\circ}$$45^{\circ}$
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GATE ECE 2008 | Question: 16
For static electric and magnetic fields in an inhomogeneous source-free medium, which of the following represents the correct form of two of Maxwell's equations? $\begin{array}{II}\nabla \bullet \mathbf{E}=0 \\ \nabla \times \textbf{B} = 0 \end{array} $ ... $\begin{array}{II}\nabla \times \mathbf{E}=0 \\ \nabla \bullet \textbf{B} = 0 \end{array}$
For static electric and magnetic fields in an inhomogeneous source-free medium, which of the following represents the correct form of two of Maxwell's equations?$\begin{a...
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GATE ECE 2008 | Question: 17
In the following limiter circuit, an input voltage $V_{i}=10 \sin 100 \pi t$ is applied. Assume that the diode drop is $0.7 \mathrm{~V}$ when it is forward biased. The Zener breakdown voltage is $6.8 \mathrm{~V}$. The maximum and minimum values of the output voltage respectively ... $7.5 \mathrm{~V},-0.7 \mathrm{~V}$ $7.5 \mathrm{~V},-7.5 \mathrm{~V}$
In the following limiter circuit, an input voltage $V_{i}=10 \sin 100 \pi t$ is applied. Assume that the diode drop is $0.7 \mathrm{~V}$ when it is forward biased. The Ze...
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GATE ECE 2008 | Question: 18
A silicon wafer has $100 \mathrm{~nm}$ of oxide on it and is inserted in a furnace at a temperature above $1000^{\circ} \mathrm{C}$ for further oxidation in dry oxygen. The oxidation rate is independent of current oxide ... of current oxide thickness but depends on temperature slows down as the oxide grows is zero as the existing oxide prevents further oxidation
A silicon wafer has $100 \mathrm{~nm}$ of oxide on it and is inserted in a furnace at a temperature above $1000^{\circ} \mathrm{C}$ for further oxidation in dry oxygen. T...
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GATE ECE 2008 | Question: 19
The drain current of a MOSFET in saturation is given by $I_{D}=K\left(V_{G S}-V_{T}\right)^{2}$ where $K$ is a constant. The magnitude of the transconductance $g_{m}$ is $\frac{K\left(V_{G S}-V_{T}\right)^{2}}{V_{D S}}$ $2 K\left(V_{G S}-V_{T}\right)$ $\frac{I_{d}}{V_{G S}-V_{D S}}$ $\frac{K\left(V_{G S}-V_{T}\right)^{2}}{V_{G S}}$
The drain current of a MOSFET in saturation is given by $I_{D}=K\left(V_{G S}-V_{T}\right)^{2}$ where $K$ is a constant. The magnitude of the transconductance $g_{m}$ is$...
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GATE ECE 2008 | Question: 20
Consider the amplitude modulated (AM) signal $A_{c} \cos \omega_{c} t+2 \cos \omega_{m} t \cos \omega_{c} t$. For demodulating the signal using envelope detector, the minimum value of $A_{c}$ should be $2$ $1$ $0.5$ $0$
Consider the amplitude modulated (AM) signal $A_{c} \cos \omega_{c} t+2 \cos \omega_{m} t \cos \omega_{c} t$. For demodulating the signal using envelope detector, the min...
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GATE ECE 2008 | Question: 21
The Thevenin equivalent impedance $\text{Z}_{\text {th }}$ between the nodes $\text{P}$ and $\text{Q}$ in the following circuit is $1$ $1+s+\frac{1}{s}$ $2+s+\frac{1}{s}$ $\frac{s^{2}+s+1}{s^{2}+2 s+1}$
The Thevenin equivalent impedance $\text{Z}_{\text {th }}$ between the nodes $\text{P}$ and $\text{Q}$ in the following circuit is$1$$1+s+\frac{1}{s}$$2+s+\frac{1}{s}$$\f...
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GATE ECE 2008 | Question: 22
The driving point impedance of the following network is given by $Z(s)=\frac{0.2 s}{s^{2}+0.1 s+2}$. The component values are $\begin{array}{lll} \mathrm{L}=5 \mathrm{~H}, & \mathrm{R}=0.5 \; \Omega, & \mathrm{C}=0.1 \mathrm{~F} \end{array}$ ...
The driving point impedance of the following networkis given by $Z(s)=\frac{0.2 s}{s^{2}+0.1 s+2}$. The component values are$\begin{array}{lll} \mathrm{L}=5 \mathrm{~H}, ...
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GATE ECE 2008 | Question: 23
The circuit shown in the figure is used to charge the capacitor $\mathrm{C}$ alternately from two current sources as indicated. The switches $\text{S1}$ and $\text{S2}$ ... $\displaystyle{}\sum_{n=0}^{\infty}\left[0.5-e^{-(t-2 n T)}+0.5 e^{-(t-2 n T-T)}\right]$
The circuit shown in the figure is used to charge the capacitor $\mathrm{C}$ alternately from two current sources as indicated. The switches $\text{S1}$ and $\text{S2}$ a...
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GATE ECE 2008 | Question: 24
The probability density function (PDF) of a random variable $\mathrm{X}$ is as shown below. The corresponding cumulative distribution function (CDF) has the form
The probability density function (PDF) of a random variable $\mathrm{X}$ is as shown below.The corresponding cumulative distribution function (CDF) has the form
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GATE ECE 2008 | Question: 25
The recursion relation to solve $x=e^{-x}$ using Newton-Raphson method is $x_{n+1}=e^{-x_{n}}$ $x_{n+1}=x_{n}-e^{-x_{n}}$ $x_{n+1}=\left(1+x_{n}\right) \frac{e^{-x_{n}}}{1+e^{-x_{n}}}$ $x_{n+1}=\frac{x_{n}^{2}-e^{-x_{n}}\left(1+x_{n}\right)-1}{x_{n}-e^{-x_{n}}}$
The recursion relation to solve $x=e^{-x}$ using Newton-Raphson method is$x_{n+1}=e^{-x_{n}}$$x_{n+1}=x_{n}-e^{-x_{n}}$$x_{n+1}=\left(1+x_{n}\right) \frac{e^{-x_{n}}}{1+e...
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GATE ECE 2008 | Question: 26
The residue of the function $f(z)=\dfrac{1}{(z+2)^{2}(z-2)^{2}}$ at $z=2$ is $-\;\frac{1}{32}$ $-\;\frac{1}{16}$ $\frac{1}{16}$ $\frac{1}{32}$
The residue of the function $f(z)=\dfrac{1}{(z+2)^{2}(z-2)^{2}}$ at $z=2$ is$-\;\frac{1}{32}$$-\;\frac{1}{16}$$\frac{1}{16}$$\frac{1}{32}$
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GATE ECE 2008 | Question: 27
Consider the matrix $\mathbf{P}=\left[\begin{array}{cc}0 & 1 \\ -2 & -3\end{array}\right]$. The value of $\mathbf{e}^{\mathbf{P}}$ ...
Consider the matrix $\mathbf{P}=\left[\begin{array}{cc}0 & 1 \\ -2 & -3\end{array}\right]$. The value of $\mathbf{e}^{\mathbf{P}}$ is$\left[\begin{array}{cc}2 e^{-2}-3 e^...
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GATE ECE 2008 | Question: 28
In the Taylor series expansion of $\exp (x)+\sin (x)$ about the point $x=\pi$, the coefficient of $(x-\pi)^{2}$ is $\exp (\pi)$ $0.5 \exp (\pi)$ $\exp (\pi)+1$ $\exp (\pi)-1$
In the Taylor series expansion of $\exp (x)+\sin (x)$ about the point $x=\pi$, the coefficient of $(x-\pi)^{2}$ is$\exp (\pi)$$0.5 \exp (\pi)$$\exp (\pi)+1$$\exp (\pi)-1$...
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GATE ECE 2008 | Question: 29
$P_{X}(x)=M \exp (-2|x|)+N \exp (-3|x|)$ is the probability density function for the real random variable $X$, over the entire $x$ axis. $M$ and $N$ are both positive real numbers. The equation relating $M$ and $N$ is $M+\frac{2}{3} N=1$ $2 M+\frac{1}{3} N=1$ $M+N=1$ $M+N=3$
$P_{X}(x)=M \exp (-2|x|)+N \exp (-3|x|)$ is the probability density function for the real random variable $X$, over the entire $x$ axis. $M$ and $N$ are both positive rea...
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GATE ECE 2008 | Question: 30
The value of the integral of the function $g(x, y)=4 x^{3}+10 y^{4}$ along the straight line segment from the point $(0,0)$ to the point $(1,2)$ in the $x\text{-}y$ plane is $33$ $35$ $40$ $56$
The value of the integral of the function $g(x, y)=4 x^{3}+10 y^{4}$ along the straight line segment from the point $(0,0)$ to the point $(1,2)$ in the $x\text{-}y$ plane...
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GATE ECE 2008 | Question: 31
A linear, time-invariant, causal continuous time system has a rational transfer function with simple poles at $s=-2$ and $s=-4$, and one simple zero at $s=-1$. A unit step $u(t)$ is applied at the input of the system. At steady state, the output has constant value of $1.$ The impulse response ... $[-0.5 \exp (-2 t)+1.5 \exp (-4 t)] u(t)$
A linear, time-invariant, causal continuous time system has a rational transfer function with simple poles at $s=-2$ and $s=-4$, and one simple zero at $s=-1$. A unit ste...
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GATE ECE 2008 | Question: 32
The signal $x(t)$ is described by $x(t)=\left\{\begin{array}{ll} 1 & \text { for }-1 \leq t \leq+1 \\ 0 & \text { otherwise } \end{array}\right.$ Two of the angular frequencies at which its Fourier transform becomes zero are $\pi, 2 \pi$ $0.5 \pi, 1.5 \pi$ $0, \pi$ $2 \pi, 2.5 \pi$
The signal $x(t)$ is described by$x(t)=\left\{\begin{array}{ll}1 & \text { for }-1 \leq t \leq+1 \\0 & \text { otherwise }\end{array}\right.$Two of the angular frequencie...
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GATE ECE 2008 | Question: 33
A discrete time linear shift-invariant system has an impulse response $h[n]$ with $h[0]=1, h[1]=-1$, $h[2]=2$, and zero otherwise. The system is given an input sequence $x[n]$ with $x[0]=x[2]=1$, and zero otherwise. The number of nonzero samples in the output sequence $y[n]$, and the value of $y[2]$ are, respectively $5,2$ $6,2$ $6,1$ $5,3$
A discrete time linear shift-invariant system has an impulse response $h[n]$ with $h[0]=1, h =-1$, $h =2$, and zero otherwise. The system is given an input sequence $x[n]...
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GATE ECE 2008 | Question: 34
Consider points $\mathrm{P}$ and $\mathrm{Q}$ in the $x\text{-}y$ plane, with $P=(1,0)$ and $Q=(0,1)$. The line integral $\displaystyle{}2 \int_{P}^{Q}(x d x+y d y)$ along the semicircle with the line segment $P Q$ as its diameter is $-1$ is $0$ is $1$ depends on the direction (clockwise or anti-clockwise) of the semicircle
Consider points $\mathrm{P}$ and $\mathrm{Q}$ in the $x\text{-}y$ plane, with $P=(1,0)$ and $Q=(0,1)$. The line integral $\displaystyle{}2 \int_{P}^{Q}(x d x+y d y)$ alon...
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GATE ECE 2008 | Question: 35
Let $x(t)$ be the input and $y(t)$ be the output of a continuous time system. Match the system properties $\mathrm{P} 1, \mathrm{P} 2$ and $\mathrm{P} 3$ with system relations $\mathrm{R} 1, \mathrm{R} 2, \mathrm{R} 3, \mathrm{R} 4 .$ ... $\text{(P1, R3), (P2, R1), (P3, R2)}$ $\text{(P1, R1), (P2, R2), (P3, R3)}$
Let $x(t)$ be the input and $y(t)$ be the output of a continuous time system. Match the system properties $\mathrm{P} 1, \mathrm{P} 2$ and $\mathrm{P} 3$ with system rela...
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GATE ECE 2008 | Question: 36
A memoryless source emits $n$ symbols each with a probability $p$. The entropy of the source as a function of $n$ increases as $\log n$ decreases as $\log (1 / n)$ increases as $n$ increases as $n \log n$
A memoryless source emits $n$ symbols each with a probability $p$. The entropy of the source as a function of $n$increases as $\log n$decreases as $\log (1 / n)$increases...
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GATE ECE 2008 | Question: 37
$\{x(n)\}$ is a real-valued periodic sequence with a period N. $x(n)$ and $X(k)$ form $\mathrm{N}$-point Discrete Fourier Transform (DFT) pairs. The DFT $Y(k)$ of the sequence $\displaystyle{}y(n)=\frac{1}{N} \sum_{r=0}^{N-1} x(r) x(n+r)$ is $|X(k)|^{2}$ ... $\displaystyle{}\frac{1}{N} \sum_{r=0}^{N-1} X(r) X(k+r)$ $0$
$\{x(n)\}$ is a real-valued periodic sequence with a period N. $x(n)$ and $X(k)$ form $\mathrm{N}$-point Discrete Fourier Transform (DFT) pairs. The DFT $Y(k)$ of the seq...
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240
GATE ECE 2008 | Question: 38
$\text{Group I}$ lists a set of four transfer functions. $\text{Group II}$ gives a list of possible step responses $y(t)$. Match the step responses with the corresponding transfer functions. $\textbf{Group I}$ \[ P=\frac{25}{s^{2}+25} \quad Q=\frac{36}{s^{2}+20 s+36} \quad R=\frac{36}{s^ ... $\text{P-2, Q-1, R-4, S-3}$ $\text{P-3, Q-4, R-1, S-2}$
$\text{Group I}$ lists a set of four transfer functions. $\text{Group II}$ gives a list of possible step responses $y(t)$. Match the step responses with the corresponding...
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