GATE ECE 1994

## GATE ECE

In order to reduce the harmonic distortion in an amplifier, its dynamic range has
to be _________

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A common emitter transistor amplifier has a collector current of 1.0 mA when its
base current is 25 $$\mu$$A at the r

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The transit time of a current carriers through the channel of an FET decides its ____________characteristics.

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In the MOSFET amplifier shown in the fig. below, the transistor has $$\mu \,\, = \,\,50,\,\,{r_d}\,\, = \,\,10\,K\Omega

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Match the following.
GROUP-1
(A) Hartley
(B) Wein-bridge
(C) Crystal
GROUP-2
(1) Low frequency oscillator
(2) High freq

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The frequency compensation is used in OP-Amps to increase its___________

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A class-A transformer coupled, transistor power Amplifier is required to deliver a power rating of the transistor shoul

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Find the output voltage of the following circuit assuming ideal op-amp behavior.

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$$v\left(t\right)\;=5\left[\cos\left(10^6\mathrm{πt}\right)\;-\;\sin\left(10^3\mathrm{πt}\right)\times\sin\left(10^6\mat

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The bandwidth required for the transmission of a PCM signal increases by a factor of ________ when the number of quanti

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Tachometer feedback in a d.c. position control system enhances stability.

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The poles of a continuous time oscillator are ___________.

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If the open loop transfer function is a ratio of a numerator polynomial of degree
'm' and a denominator polynomial

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Reduce the signal flow graph shown in fig. below, to obtain another graph which does not contain the node e5.Also, remov

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The response of an LCR circuit to a step input is
(a) Over damped
(b) Critically damped
(c) Oscillatory
If the transfer

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Match the following with List-1 with List-2
List-1
(a) Very low response at very high frequencies.
(b) Overshoot
(c) Sy

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If G(s) is a stable transfer function, then $$F\left(s\right)=\frac1{G\left(s\right)}$$ is always a stable transfer
func

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The 3-dB bandwidth of a typical second- order system with the transfer function
$${{C\left( s \right)} \over {R(s)}} = {

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The open loop frequency response of a system at two particular frequencies are given by: 1.2 $$\angle - 180^\circ $$ a

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A ring oscillator consisting of 5 inverters is running at a frequency of 1.0 MH$$_z$$. The progagation delay per gate is

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A Boolean function, F , given as sum of product (SOP) terms as F= $$\sum {} $$m(3,4,5,6) with A,B, and C as inputs. The

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Synchronous counters are _____ than the ripple counters.

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A PLA can be used

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A dynamic RAM consists of

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In the output stage of a standard TTL, we have a diode between the emitter of the pull up transistor and the collector o

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Match the List-1 (type of 8-bit ADC) with List-2(Minimum conversion time in clock cycles)
List - 1
A. Successive ap

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A load impedance (200 + j0) $$\Omega $$ is to be matched to a 50$$\Omega $$ lossless transmission line by using a quarte

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A plane electromagnetic wave traveling along the +z-direction, has its electric field given by Ex = 2 cos $$\left( {\ome

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If a pure resistance load, when connected to a lossless 75-ohm line, produces a VSWR of 3 on the line, then the load imp

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A wave traveling in the $$+Z$$-direction, is the resultant of two linearly polarized components, $${E_x}\,\,\, = \,\,\,\

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The interior of a $${{20} \over 3}\,\,cm\,\, \times \,\,{{20} \over 4}\,\,cm$$ rectangular waveguide is completely fille

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A rectangular hollow metal waveguide of internal cross-section of $$7.366\,\,cm\,\, \times \,\,3.556\,cm$$ carries a 3 G

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Two spacecrafts are separated by 3000 km. Each has a paraboloidal reflector antenna of 0.85 m diameter operating at a fr

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For a dipole antenna

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A p-type silicon sample has a higher conductivity compared to an n-type sample
having the same dopant concentration.

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A small concentration of minority carries is injected into a homogeneous
semiconductor crystal at one point. An ele

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Channel current is reduced on application of a more positive voltage to the gate
of a depletion mode n-channel MOSFET.

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The transit time of the current carriers through the channel of an FET decides
its ____________characteristics.

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The threshold voltage of an n-channel MOSFET can be increased by

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The following system of equations
$${{x_1} + {x_2} + {x_3} = 3}$$
$${{x_1} - {x_3} = 0}$$
$${{x_1} - {x_2} + {x_3} = 1}

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The rank of $$\left( {m \times n} \right)$$ matrix $$\left( {m < n} \right)$$ cannot be more then

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The function $$y = {x^2} + {{250} \over x}$$ at $$x=5$$ attains

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$$y = {e^{ - 2x}}$$ is a solution of the differential equation $$\,{y^{11}} + {y^1} - 2y = 0$$

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Match each of the items $$A, B, C$$ with an appropriate item from $$1, 2, 3, 4$$ and $$5$$
List-$${\rm I}$$
$$(P)$$ $${a

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Write down the sequence of Instructions which are actually (till HLT instruction), if the program begins with the locati

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A generator of internal impedance, ZG, delivers maximum power to a load impedance, ZL, only if ZL = ................

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A ramp voltage, v(t) = 100 t Volts, is applied to an RC differentiating circuit with R = $$5k\Omega$$ and C = $$4\mu F$$

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Write down the mesh equation of the following network in terms of i1(t) and i2(t).Derive the differential equation for i

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The condition, that a 2-port network is reciprocal, can be expressed in terms of its ABCD parameters as ...............

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The circuit shown in the figure, is initially in its steady state. Switch is opened at
t = 0.
(1) Determine the initial

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A series LCR circuit consisting of $$R = 10\Omega $$, $$\left| {{X_L}} \right|\,\,\, = 20\Omega $$ and $$\left| {{X_C}}

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Calculate the frequency at which zero- transmission is obtained from the Wien- bridge shown in Fig.

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Assuming that the amplifier shown in the Fig., below, is a voltage-controlled voltage source, show that the voltage tran

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The Fourier Series of an odd periodic function, contains only

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The laplace transform of a unit ramp function starting at t=a, is

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Indicate whether the following statement is TRUE/FALSE: Give reason for your answer.
If G(s) is a stable transfer func

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Match each of the items A, B and C with an appropriate item from 1, 2, 3, 4 and 5.
List - 1
(A) $${a_1}{{{d^{2y}}} \ove

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Increased pulse-width in the flat-top sampling, leads to

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A signal, f(t) = $${e^{ - at}}$$ u(t), where u(t) is the unit step function, is applied to the input of a low-pass filte

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