Recent activity by makhdoom ghaya

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1

GATE ECE 2001 | Question: 9
A monochrome video signal that ranges from $0$ to $8 \mathrm{~V}$, is digitized using an $8$-bit $\mathrm{ADC}$. Determine the resolution of the $\mathrm{ADC}$ in $\mathrm{V} / \mathrm{bit}$. Calculate the mean squared quantization error. Suppose the ADC ... $1 \; \mathrm{MHz}$. What is the time taken in seconds to get a digital equivalent of $1.59 \mathrm{~V} ?$

edited in Others Nov 25, 2022

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GATE ECE 2001 | Question: 2.16
The open-loop $\text{DC}$ gain of a unity negative feedback system with closed-loop transfer function $\frac{s+4}{s^{2}+7 s+13}$ is $\frac{4}{13}$ $\frac{4}{9}$ $4$ $13$

edited in Others Nov 25, 2022

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GATE ECE 2001 | Question: 2.13
In the $\text{DRAM}$ cell in the figure is the $V_{t}$ of the $\text{NMOSFET}$ is $1 \mathrm{~V}$. For the following three combinations of $\mathrm{WL}$ and $\mathrm{BL}$ voltages. $5 \mathrm{~V} ; 3 \mathrm{~V} ; 7 \mathrm{~V}$ ... $5 \mathrm{~V} ; 5 \mathrm{~V} ; 5 \mathrm{~V}$ $4 \mathrm{~V} ; 4 \mathrm{~V} ; 4 \mathrm{~V}$

edited in Others Nov 25, 2022

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GATE ECE 2001 | Question: 2.10
In the figure, the $\text{LED}$ emits light when both $S_{1}$ and $S_{2}$ are closed. emits light when both $S_{1}$ and $S_{2}$ are open. emits light when only of $S_{1}$ or $S_{2}$ is closed. does not emit light, irrespective of the switch positions.

edited in Others Nov 25, 2022

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GATE ECE 2001 | Question: 2.5
An npn $\text{BJT}$ has $\mathrm{gm}=38 \mathrm{~m} \mathrm{~A} / \mathrm{V}, \mathrm{C}_{u}=10^{-14} \mathrm{~F}$, $C_{\pi}=4 \times 10^{-13} \mathrm{~F}$, and $D C$ current gain $\beta_{0}=90$. For this transistor $f_{\mathrm{T}}$ ... $f_{\mathrm{T}}=1.47 \times 10^{10} \mathrm{~Hz}$ and $f_{\beta}=1.33 \times 10^{12} \mathrm{~Hz}$

edited in Others Nov 25, 2022

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GATE ECE 2001 | Question: 2.3
When the angular frequency $\omega$ in the figure, varied from $0$ to $\infty$, the locus of the current phasor $\mathrm{I}_{2}$ is given by

edited in Others Nov 25, 2022

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GATE ECE 2001 | Question: 1.23
If a plane electromagnetic wave satisfies the equation $\frac{\partial^{2} \mathrm{E}_{\mathrm{x}}}{\partial \mathrm{z}^{2}}=\mathrm{c}^{2} \frac{\partial^{2} \mathrm{E}_{\mathrm{x}}}{\partial \mathrm{t}^{2}}$, the wave propagates in the $x$-direction $z$-direction $y$-direction $x y$ plane at an angle of $45^{\circ}$ between the $x$ and $z$ directions

edited in Others Nov 25, 2022

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GATE ECE 2001 | Question: 1.9
The ideal $\text{OP-AMP}$ has the following characteristics. $\mathrm{R}_{\mathrm{i}}=\infty, \mathrm{A}=\infty, \mathrm{R}_{0}=0$ $\mathrm{R}_{\mathrm{i}}=0, \mathrm{~A}=\infty, \mathrm{R}_{0}=0$ $\mathrm{R}_{\mathrm{i}}=\infty, \mathrm{A}=\infty, \mathrm{R}_{0}=\infty$ $\mathrm{R}_{1}=0, \mathrm{~A}=\infty, \mathrm{R}_{0}=\infty$

edited in Others Nov 25, 2022

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GATE ECE 2002 | Question: 13
A unity feedback system has the plant transfer function $G_{p}(s)=\frac{1}{(s+1)(2 s+1)}$ Determine the frequency at which the plant has a phase lag of $90^{\circ}$. An integral controller with transfer function $G_1(s)=\frac{k}{s}$ ... has an open-loop gain margin of $2.5$. Determine the steady state errors of the compensated system to unit-step and unit-ramp inputs.

edited in Others Nov 25, 2022

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GATE ECE 2002 | Question: 11
It is required to design a binary mod-$5$ synchronous counter using $\text{AB}$ flip-flops such that the output $Q_{2} Q_{1} Q_{0}$ changes as $000 \rightarrow 001 \rightarrow 010 \ldots \ldots$ ... . Hence, complete the circuit diagram for the mod-$5$ counter given in the figure using minimum number of $2$-input NAND-gate only.

edited in Others Nov 25, 2022

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GATE ECE 2002 | Question: 8
Consider the circuit of the figure is. The $\text{op amp}$ used is ideal. In which mode is the $\text{BJT}$ operating (i.e. active, saturation or cut off)? Justify your answer. Obtain an expression relating the output current $\mathrm{I}_0$ ... $\beta=99$ and $\mathrm{V}_{\mathrm{BE}}=0.7 \mathrm{~V}$ )

edited in Others Nov 25, 2022

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GATE ECE 2002 | Question: 2.10
The circuit in the figure is has two $\text{CMOS NOR}$-gates. This circuit functions as a flip-flop schmitt trigger nonostable multivibrator astable multivibrator

edited in Others Nov 24, 2022

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GATE ECE 2002 | Question: 1.18
A linear phase channel with phase delay $T_p$ and group delay $T_g$ must have $T_p=T_g=$ constant $T_p \propto f$ and $T_g \propto f$ $T_p=$ constant and $T_g \propto f$ $T_p \propto f$ and $T_g = $ constant ($f$ denotes frequency)

edited in Others Nov 24, 2022

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GATE ECE 2002 | Question: 1.23
The $\text{VSWR}$ can have any value between $0$ and $1$ $-1$ and $+1$ $0$ and $\infty$ $1$ and $\infty$

edited in Others Nov 24, 2022

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GATE ECE 2002 | Question: 1.8
Three identical $\text{RC}$-coupled transistor amplifiers are cascaded. If each of the amplifiers has a frequency response as shown in the figure is the overall frequency response is as given in

edited in Others Nov 24, 2022

37 views

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GATE ECE 2003 | Question: 82
If $\text{S}$ represents the carrier synchronization at the receiver and $\rho$ represents the bandwidth efficiency, then the correct statement for the coherent binary $\text{PSK}$ is $\rho=0.5, S$ is required $\rho=1.0, S$ is required $\rho=0.5, \mathrm{~S}$ is not required $\rho=1.0, S$ is not required

edited in Others Nov 24, 2022

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GATE ECE 2003 | Question: 80
If $E_{b^{\prime}}$ the energy per bit of a binary digital signal, is $10^{-6}$ watt-sec and the one-sided power spectral density of the white noise, $\mathrm{N}_{0}=10^{-5} \mathrm{~W} / \mathrm{Hz}$, then the output $\text{SNR}$ of the matched filter is $26 \mathrm{~dB}$ $10 \mathrm{~dB}$ $20 \mathrm{~dB}$ $13 \mathrm{~dB}$

edited in Others Nov 24, 2022

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GATE ECE 2003 | Question: 77
Choose the correct one from among the alternative $\text{A, B, C. D}$ after matching an item in Group $1$ with the most appropriate item in Group $2.$ ... $\text{P - 6 Q - 1 R - 3 S - 2}$ $\text{P - 5 Q - 6 R - 1 S - 3}$

edited in Others Nov 24, 2022

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GATE ECE 2003 | Question: 76
The data for Q. 75-76 are given below. Solve the problems and choose the correct answers. Let $m(t)=\cos \left[\left(4 \pi \times 10^{3}\right) t\right]$ be the message signal and $\left.c(t)=5 \cos \left[2 \pi \times 10^{b}\right) t\right]$ be the carrier $c(t)$ and ... the Bessel coefficients) is $5 J_{4}(3)$ $\frac{5}{2} J_{8}(3)$ $\frac{5}{2} J_{8}(4)$ $5 J_{4}(6)$

edited in Others Nov 24, 2022

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GATE ECE 2003 | Question: 73
The zero-input response of a system given by the state-space equation $\left[\begin{array}{l}\dot{x}_{1} \\ \dot{x}_{2}\end{array}\right]=\left[\begin{array}{ll}1 & 0 \\ 1 & 1\end{array}\right]\left[\begin{array}{l}x_{1} \\ x_{2}\end{array}\right]$ ... $\left[\begin{array}{c}t \\ t e^{t}\end{array}\right]$

edited in Others Nov 24, 2022

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GATE ECE 2003 | Question: 70
The approximate Bode magnitude plot of a minimum-phase system is shown in the figure. The transfer function of the system is $10^8 \frac{(s+0.1)^3}{(s+10)^2(s+100)}$ $10^{7} \frac{(s+0.1)^3}{(s+10)(s+100)}$ $10^8 \frac{(s+0.1)^2}{(s+10)^2(s+100)}$ $10^9 \frac{(s+0.1)^3}{(s+10)(s+100)^2}$

edited in Others Nov 24, 2022

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22

GATE ECE 2003 | Question: 57
The circuit shown in the figure is a $4$ bit $\text{DAC}$ The input bits $0$ and $1$ are represented by $0$ and $5 \mathrm{~V}$ respectively. The $\text{OP AMP}$ is ideal, but all the resistances and the $5 \mathrm{~V}$ inputs have a tolerance of $\pm 10 \%$. The ... $5 \%$ ) for the tolerance of the $\text{DAC}$ is $\pm 35 \%$ $\pm 20 \%$ $\pm 10 \%$ $\pm 5 \%$

edited in Others Nov 24, 2022

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23

GATE ECE 2003 | Question: 53
The circuit shown in the figure has $4$ boxes each described by inputs $P, Q, R$ and outputs $Y, Z$ with \[\begin{array}{l} Y=P \oplus Q \oplus R \\ Z=R Q+\bar{P} R+Q \bar{P} \end{array}\] The circuit acts as a $4$ bit adder giving $P+Q$ $4$ bit subtractor giving $P-Q$ $4$ bit subtractor giving $Q-P$ $4$ bit adder giving $P+Q+R$

edited in Others Nov 24, 2022

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24

GATE ECE 2003 | Question: 50
If the $\text{op-amp}$ in the figure is idea, the output voltage Voult will be equal to $1 \mathrm{~V}$ $6 \mathrm{~V}$ $14 \mathrm{~V}$ $17 \mathrm{~V}$

edited in Others Nov 24, 2022

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25

GATE ECE 2003 | Question: 49
The action of a $\text{JFET}$ in its equivalent circuit can best be represented as a Current Controlled Current Source Current Controlled Voltage Source Voltage Controlled Voltage Source Voltage Controlled Current Source

edited in Others Nov 24, 2022

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26

GATE ECE 2003 | Question: 45
An amplifier without feedback has a voltage gain of $50$, input resistance of $1 \mathrm{~K} \Omega$ and output resistance of $2.5 \mathrm{~K} \Omega$ ... $1 / 5 \mathrm{~K} \Omega$ $5 \mathrm{~K} \Omega$ $11 \mathrm{~K} \Omega$

edited in Others Nov 24, 2022

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27

GATE ECE 2003 | Question: 42
A particular green $\text{LED}$ emits light of wavelength $5490 \text{ A}$. The energy bandgap of the semiconductor material used there is (Planck's constant = $6.626 \times 10^{-34} \mathrm{~J-s})$ $2.26 \; \mathrm{eV}$ $1.98 \; \mathrm{eV}$ $1.17 \; \mathrm{eV}$ $0.74 \; \mathrm{eV}$

edited in Others Nov 24, 2022

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28

GATE ECE 2003 | Question: 32
The current flowing through the resistance $\text{R}$ in the circuit in the figure has the form $\text{P} \cos 4 t$, where $\text{P}$ is $(0.18+j 0.72)$ $(0.46+j 1.90)$ $-(0.18+j 1.90)$ $-(0.192+j 0.144)$

edited in Others Nov 24, 2022

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GATE ECE 2003 | Question: 28
At a given probability of error, binary coherent $\text{FSK}$ is inferior to binary coherent $\text{PSK}$ by $6 \mathrm{~dB}$ $3 \mathrm{~dB}$ $2 \mathrm{~dB}$ $0 \mathrm{~dB}$

edited in Others Nov 24, 2022

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GATE ECE 2003 | Question: 18
The output of the $74$ series of $\text{TTL}$ gates is taken from a $\text{BJT}$ in totem pole and common collector configuration either totem pole or open collector configuration common base configuration common collector configuration

edited in Others Nov 24, 2022

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31

GATE ECE 2003 | Question: 3
A series $\text{RLC}$ circuit has a resonance frequency of $1 \; \mathrm{kHz}$ and a quality factor $\text{Q}=100$. If each of $\text{R, L}$ and $\text{C}$ is doubled from its original value, the new $\text{Q}$ of the circuit is $25$ $50$ $100$ $200$

edited in Others Nov 24, 2022

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32

GATE ECE 2004 | Question: 63
A causal $\text{LTI}$ system is described by the difference equation \[2 y[n]=\alpha y[n-2]-2 x[n]+\beta x[n-1]\] The system is stable only if $|\alpha|=2, \quad|\beta|<2$ $|\alpha|>2, \quad|\beta|>2$ $|\alpha|<2$, any value of $\beta$ $|\beta \mid<2,$ any value of $\alpha$

edited in Others Nov 23, 2022

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GATE ECE 2004 | Question: 61
A rectangular pulse train $s(t)$ as shown in the figure is convolved with the signal $\cos ^{2}\left(4 p \times 10^{3} t\right)$. The convolved signal will be a $\text{DC}$ $12 \; \mathrm{kHz}$ sinusoid $8 \; \mathrm{kHz}$ sinusoid $14 \; \mathrm{kHz}$ sinusoid

edited in Others Nov 23, 2022

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GATE ECE 2004 | Question: 48
In the $\text{op-amp}$ circuit given in the figure, the load current $i_{\text{L}}$ is $-\frac{v_{s}}{R_{2}}$ $\frac{v_{s}}{R_{2}}$ $-\frac{v_{s}}{R_{\text{L}}}$ $\frac{v_{s}}{R_{1}}$

edited in Others Nov 23, 2022

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35

GATE ECE 2004 | Question: 43
The longest wavelength that can be absorbed by silicon, which has the bandgap of $1.12 \; \mathrm{eV}$, is $1$. If the longest wavelength that can be absorbed by another material is $0.87 \; \mu \mathrm{m}$, then the bandgap of this material is $1.416 \; \mathrm{eV}$ $0.886 \: \mathrm{eV}$ $0.854 \: \mathrm{eV}$ $0.706 \: \mathrm{eV}$

edited in Others Nov 23, 2022

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GATE ECE 2004 | Question: 42
The drain of an $n$-channel MOSFET is shorted to the gate so that $V_{G S}=V_{D s}$. The threshold voltage $\left(V_{T}\right)$ of MOSFET is $1 \mathrm{~V}$. If the drain current $\left(\mathrm{I}_{\mathrm{D}}\right)$ is $1 \mathrm{~mA}$ ... $2 \mathrm{~mA}$ $3 \mathrm{~mA}$ $9 \mathrm{~mA}$ $4 \mathrm{~mA}$

edited in Others Nov 23, 2022

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GATE ECE 2004 | Question: 40
Consider an abrupt $p$-junction. Let $V_{\text {in }}$ be the built-in potential of this junction and $\mathrm{V}_{\mathrm{R}}$ be the applied reverse bias. If the junction capacitance $\left(\mathrm{C}_{t}\right)$ is $1 \; \mathrm{pF}$ ... $4 \; \mathrm{pF}$ $2 \; \mathrm{pF}$ $0.25 \; \mathrm{pF}$ $0.5 \; \mathrm{pF}$

edited in Others Nov 23, 2022

18 views

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GATE ECE 2004 | Question: 25
In a $\text{PCM}$ system, if the code word length is increased from $6$ to $8$ bits, the signal to quantization noise ratio improves by the factor $8 / 6$ $12$ $16$ $8$

edited in Others Nov 23, 2022

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GATE ECE 2004 | Question: 17
Figure given below shows the internal schematic of a $\text{TTL AND-OR}$ -Invert $\text{(AOI)}$ gate. For the inputs shown in the given figure, the output $\text{Y}$ is $0$ $1$ $\mathrm{AB}$ $\overline{\mathrm{AB}}$

edited in Others Nov 23, 2022

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40

GATE ECE 2004 | Question: 16
Choose the correct one from among the alternatives $\text{A, B, C, D}$ after matching an item from Group $1$ with the most appropriate item in Group $2.$ ... $\mathrm{P}-2, \mathrm{Q}-1, \mathrm{R}-3$ $\text{P - 1, Q - 2, R - 2}$

edited in Others Nov 23, 2022

15 views