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1281
GATE ECE 1994 | Question 1.15
Increased pulse-width in the flat-top sampling, leads to attenuation of high frequencies in reproduction attenuation of low frequencies in reproduction greater aliasing errors in reproduction no harmful effects in reproduction
Increased pulse-width in the flat-top sampling, leads toattenuation of high frequencies in reproductionattenuation of low frequencies in reproductiongreater aliasing erro...
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1282
GATE ECE 1994 | Question 1.16
Medium wave radio signals may be received at far off distances at night because radio waves travel faster at night ground wave attenuation is low at night the sky wave is stronger at night their is no fading at night
Medium wave radio signals may be received at far off distances at night becauseradio waves travel faster at nightground wave attenuation is low at nightthe sky wave is st...
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1284
GATE ECE 1994 | Question 1.18
A plane eelctromagnetic wave travelling along $+z$ – direction, has its electric field given by $\mathrm{E}_{x}=2 \cos \left({ }^{*} t\right)$ and $\mathrm{E}_{y}=2 \cos \left({ }^{*} t+90^{\circ}\right)$. The wave is linearly polarised right circularly polarised left circularly polarised elliptically polarised
A plane eelctromagnetic wave travelling along $+z$ – direction, has its electric field given by$\mathrm{E}_{x}=2 \cos \left({ }^{*} t\right)$ and $\mathrm{E}_{y}=2 \cos...
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1285
GATE ECE 1994 | Question 1.19
For a dipole antenna the radiation intensity is maximum along the normal to the dipole axis the current distribution along its length is uniform irrespective of the length the effective length equals its physical length the input impedance is independent of the location of the feed-point
For a dipole antennathe radiation intensity is maximum along the normal to the dipole axisthe current distribution along its length is uniform irrespective of the lengtht...
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1286
GATE ECE 1994 | Question 2.1
$ \quad f_{c} \vec{A} \cdot d \vec{t} =\int_{s}---. d \vec{s}$
$ \quad f_{c} \vec{A} \cdot d \vec{t} =\int_{s} -. d \vec{s}$
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1287
GATE ECE 1994 | Question 2.2
The rank of an $(m \times n)$ matrix $(m < n)$ cannot be more than __________.
The rank of an $(m \times n)$ matrix $(m < n)$ cannot be more than __________.
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1288
GATE ECE 1994 | Question 2.3
The condition that a $z$-port network is reciprocal, can be expressed in terms of its $\mathrm{ABCD}$ parameters as _________.
The condition that a $z$-port network is reciprocal, can be expressed in terms of its $\mathrm{ABCD}$ parameters as _________.
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1289
GATE ECE 1994 | Question 2.4
A generator of internal impedance, $Z_{\mathrm{G}^{\prime}}$ deliver maximum power to a load impedance, $Z_{I^{\prime}}$ only if $Z_{I^{\prime}}=$ _________.
A generator of internal impedance, $Z_{\mathrm{G}^{\prime}}$ deliver maximum power to a load impedance, $Z_{I^{\prime}}$ only if $Z_{I^{\prime}}=$ _________.
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1290
GATE ECE 1994 | Question 2.5
The open loop frequency response of a system at two particular frequencies are given by : $1.2 \; \angle \; 180^{\circ}$ and $1.0 \; \angle \; -190^{\circ}$. The closed loop unity feed back control is then ___________.
The open loop frequency response of a system at two particular frequencies are given by : $1.2 \; \angle \; 180^{\circ}$ and $1.0 \; \angle \; -190^{\circ}$.The closed lo...
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1291
GATE ECE 1994 | Question 2.6
The poles of a continuous time oscillators are ___________.
The poles of a continuous time oscillators are ___________.
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1292
GATE ECE 1994 | Question 2.7
The forward dynamic resistance of a junction diode varies ________ as the forward current.
The forward dynamic resistance of a junction diode varies ________ as the forward current.
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1293
GATE ECE 1994 | Question 2.8
The transit time of the current carriers through the channel of an $\text{FET}$ decides its _________ chracteristics.
The transit time of the current carriers through the channel of an $\text{FET}$ decides its _________ chracteristics.
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1294
GATE ECE 1994 | Question 2.9
In order to reduce the harmonic distortion in an amplifier, its dynamic range has to be ___________.
In order to reduce the harmonic distortion in an amplifier, its dynamic range has to be ___________.
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1295
GATE ECE 1994 | Question 2.10
A common emitter transistor amplifier has a cullector corrent of $1.0 \mathrm{~mA}$ when its base current is $25 \; \mu \mathrm{A}$ at the room temperature. It's input resistance is approximately equal to ___________.
A common emitter transistor amplifier has a cullector corrent of $1.0 \mathrm{~mA}$ when its base current is $25 \; \mu \mathrm{A}$ at the room temperature. It's input re...
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1296
GATE ECE 1994 | Question 2.11
A pulse having a rise time of $40 \mathrm{n \; sec}$ is displayed on a $\text{CRO}$ of $12 \; \mathrm{MHz}$ bandwidth. The rise time of the pulse as observed on the $\text{CRO}$ would be approximately equal to ____________.
A pulse having a rise time of $40 \mathrm{n \; sec}$ is displayed on a $\text{CRO}$ of $12 \; \mathrm{MHz}$ bandwidth. The rise time of the pulse as observed on the $\tex...
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1297
GATE ECE 1994 | Question 2.12
For the $2 \mathrm{N} \; 338$ transistor, the manufacturer specifics $\mathrm{P}_{\max }=100 \mathrm{~mW}$ at $25^{\circ} \mathrm{C}$ free-air temperature and the maximum Junction temperature, $\mathrm{T}_{\mathrm{jmax}{ }^{\prime}}=125^{\circ} \mathrm{C}$. Its thermal resistance is ___________.
For the $2 \mathrm{N} \; 338$ transistor, the manufacturer specifics $\mathrm{P}_{\max }=100 \mathrm{~mW}$ at $25^{\circ} \mathrm{C}$ free-air temperature and the maximum...
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1298
GATE ECE 1994 | Question 2.13
The frequency compensation is used in $\text{op-amps}$ to increase its __________.
The frequency compensation is used in $\text{op-amps}$ to increase its __________.
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1299
GATE ECE 1994 | Question 2.14
A $2 \; \mu \; \mathrm{sec}$ pulse can be strecthed into a $10 \mathrm{~m \; sec}$ pulse by using a ________ circuit.
A $2 \; \mu \; \mathrm{sec}$ pulse can be strecthed into a $10 \mathrm{~m \; sec}$ pulse by using a ________ circuit.
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1300
GATE ECE 1994 | Question 2.15
Synchronous counters are __________ than the ripple counters.
Synchronous counters are __________ than the ripple counters.
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1301
GATE ECE 1994 | Question 2.16
A ring oscillator consisting of $5$ inverters is running at a frequency of $1.0 \; \mathrm{MHz}$. The propagation delay per gate is_________ $n \; \mathrm{sec}$.
A ring oscillator consisting of $5$ inverters is running at a frequency of $1.0 \; \mathrm{MHz}$. The propagation delay per gate is_________ $n \; \mathrm{sec}$.
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1302
GATE ECE 1994 | Question 2.17
A $10 \; \mathrm{MHz}$ carrier is frequency modulated by a sinusoidal signal of $500 \; \mathrm{hz}$, the maximum frequency deviation being $50 \; \mathrm{kHz}$. The bandwidth required, as given by the Carson's rule is ____________.
A $10 \; \mathrm{MHz}$ carrier is frequency modulated by a sinusoidal signal of $500 \; \mathrm{hz}$, the maximum frequency deviation being $50 \; \mathrm{kHz}$. The band...
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1303
GATE ECE 1994 | Question 2.18
The bandwidth required for the transmission of a $\text{PCM}$ signal increases by a factor of _________ when the number of quantization levels is increased from $4$ to $64$ .
The bandwidth required for the transmission of a $\text{PCM}$ signal increases by a factor of _________ when the number of quantization levels is increased from $4$ to $6...
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1304
GATE ECE 1994 | Question 2.19
A load impedance, $(200+\mathrm{jo}) \; \Omega$ is to be matched to a $50 \; \Omega$ lossless transmission line by using a a quarter wave line transformer $\text{(QWT)}$. The characteristic impedance of the $\text{QWT}$ required is ____________.
A load impedance, $(200+\mathrm{jo}) \; \Omega$ is to be matched to a $50 \; \Omega$ lossless transmission line by using a a quarter wave line transformer $\text{(QWT)}$....
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1305
GATE ECE 1994 | Question 2.20
The interior of a $\frac{20}{3} \mathrm{~cm} \times \frac{20}{4} \mathrm{~cm}$ rectangular wave guide is completely filled with a dielectric of $\varepsilon_{r}=4$. Waves of free space wave-lengths shorter than ___________ can be propagated in the $TE_{11}$ mode.
The interior of a $\frac{20}{3} \mathrm{~cm} \times \frac{20}{4} \mathrm{~cm}$ rectangular wave guide is completely filled with a dielectric of $\varepsilon_{r}=4$. Waves...
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1306
GATE ECE 1994 | Question 3.1
$Z(s)=\frac{5}{s^{2}+4}$ represents the input impedance of a network.
$Z(s)=\frac{5}{s^{2}+4}$ represents the input impedance of a network.
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1307
GATE ECE 1994 | Question 3.2
Tachometer feedback in $a d.c$. position control system enhances stability.
Tachometer feedback in $a d.c$. position control system enhances stability.
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1308
GATE ECE 1994 | Question 3.3
If $G(s)$ is a stable transfer function, then $F(s)=\frac{1}{G(s)}$ is always a stable transfer function.
If $G(s)$ is a stable transfer function, then $F(s)=\frac{1}{G(s)}$ is always a stable transfer function.
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1309
GATE ECE 1994 | Question 3.4
A $p$-type silicon sample has a higher conductivity compared to an $n$-type sample having the same dopant concentration.
A $p$-type silicon sample has a higher conductivity compared to an $n$-type sample having the same dopant concentration.
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1310
GATE ECE 1994 | Question 3.5
Channel current is reduced on application of a more positive voltage to the gate of a depletion mode $n$-channel $\text{MOSFET}$.
Channel current is reduced on application of a more positive voltage to the gate of a depletion mode $n$-channel $\text{MOSFET}$.
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1311
GATE ECE 1994 | Question 3.6
The look-ahead carry adder is a parallel carry adder where all sum digits are generated directly from the input digits.
The look-ahead carry adder is a parallel carry adder where all sum digits are generated directly from the input digits.
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1312
GATE ECE 1994 | Question 3.7
In the output stage of a standard $\text{TTL}$, have a diode between the emitter of the pull-up transistor and the collector of the pull-down transistor. The purpose of this diode is to isolate the output node from the power supply $V_{\alpha^{\circ}}$
In the output stage of a standard $\text{TTL}$, have a diode between the emitter of the pull-up transistor and the collector of the pull-down transistor. The purpose of t...
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1313
GATE ECE 1994 | Question 3.8
Pulse-width modulated signals are immune to noise since their amplitude is constant.
Pulse-width modulated signals are immune to noise since their amplitude is constant.
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1314
GATE ECE 1994 | Question 3.9
Noise figure of an amplifier is always greater than $1$ .
Noise figure of an amplifier is always greater than $1$ .
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1315
GATE ECE 1994 | Question 3.10
If a pure resistance load, when connected to a lossless $75$ – ohm line, produces a $\text{VSWR}$ of $3$ on the line, then the load impedance can only be $25$ ohms.
If a pure resistance load, when connected to a lossless $75$ – ohm line, produces a $\text{VSWR}$ of $3$ on the line, then the load impedance can only be $25$ ohms.
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1318
GATE ECE 1994 | Question 4.3
(A) Very low response at very high frequencies (B) Over shoot (C) Synchro-control transformer output Low-pass systems Velocity damping Natural frequency Phase-sensitive modulation Damping ratio
(A) Very low response at very high frequencies(B) Over shoot(C) Synchro-control transformer outputLow-pass systemsVelocity dampingNatural frequencyPhase-sensitive modulat...
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1320
GATE ECE 1994 | Question: 4.5
(A) Hartley (1) Low frequency oscillator (B) Wien-bridge (2) High frequency oscillator (C) Crystal (3) Stable frequency oscillator (4) Relaxation frequency oscillator (5) Negative resistance oscillator
(A) Hartley(1) Low frequency oscillator(B) Wien-bridge(2) High frequency oscillator(C) Crystal(3) Stable frequency oscillator (4) Relaxation frequency oscillator (5) Nega...
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