Exam Details
Electronics & Communication Engineering (EC) 2020
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Questions
65
Duration
180 mins
Package
ESE & GATE EC - Previous Year Papers
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65questions
Medium
38
58.5%
Hard
25
38.5%
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2
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65questions
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42
64.6%
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23
35.4%
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Sample
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PYP
Electronics & Communication Engineering (EC) 2020
The untimely loss of life is a cause of serious global concern as thousands of people get killed ………… accidents every year while many other die ………. diseases like cardiovascular
PYP
Electronics & Communication Engineering (EC) 2020
He was not only accused of theft ……. of conspiracy.
PYP
Electronics & Communication Engineering (EC) 2020
Select the word that fits the analogy:
Explicit: Implicit:: Express: …………..
Explicit: Implicit:: Express: …………..
PYP
Electronics & Communication Engineering (EC) 2020
The Canadian constitution requires that equal importance be given to English and French. Last year. Air Canada lost a lawsuit, and had to pay a six-figure fine to a French-speaking couple after they filed complaints about formal in-flight announcements in English lasting 15 seconds, as opposed to informal 5 second messages in French,
The French-speaking couple were upset at
The French-speaking couple were upset at
PYP
Electronics & Communication Engineering (EC) 2020
A super additive function n f (.) satisfies the following property
Which of the following functions is a super additive function for x > 1?
Which of the following functions is a super additive function for x > 1?
PYP
Electronics & Communication Engineering (EC) 2020
The global financial crisis in 2008 is considered to be the most serious world-wide financial crisis, which started with the sub-prime lending crisis in USA in 2007. The subprime lending crisis led to the banking crisis in 2008 with the collapse of Lehman Brothers in 2008. The sub-prime lending refers to the provision of loans to those borrowers who may have difficulties in repaying loans, and it arises because of excess liquidity following the East Asian crisis.
Which one of the following sequences shows the correct precedence as per the given passage?
Which one of the following sequences shows the correct precedence as per the given passage?
PYP
Electronics & Communication Engineering (EC) 2020
It is quarter past three in your watch. The angle between the hour hand and the minute hand
PYP
Electronics & Communication Engineering (EC) 2020
A circle with centre O is shown in the figure. A rectangle PQRS of maximum possible area is inscribed in the circle. If the radius of the circle is a, then the area of the shaded portion is ……….. .
PYP
Electronics & Communication Engineering (EC) 2020
a, b, c are real numbers. The quadratic equation ax2 – bx + c = 0 has equal roots, which is β, then.
PYP
Electronics & Communication Engineering (EC) 2020
The following figure shows the data of students enrolled in 5 years (2014 to 2018) for two schools P and Q. During this period, the ratio of the average number of the students enrolled in schools P to the average of the difference of the number of students enrolled in schools P and Q is ………. .
PYP
Electronics & Communication Engineering (EC) 2020
A transmission line of length 3λ/4 and having a characteristic impedance of 50 Ω is terminated with a load of 400 Ω. The impedance (rounded off to two decimal places) seen at the input end of the transmission line is _______ Ω.
PYP
Electronics & Communication Engineering (EC) 2020
In the given circuit, the two-port network has the impedance matrix . The value of ZL for which maximum power is transferred to the load is ……. Ω.
PYP
Electronics & Communication Engineering (EC) 2020
Consider the recombination process via bulk traps in a forward biased pn homojunction diode. The maximum recombination rate is Umax. If the electron and the hole capture cross-sections are equal, which one of the following is FALSE?
PYP
Electronics & Communication Engineering (EC) 2020
In the circuit shown below, the Thevenin voltage VTH is
PYP
Electronics & Communication Engineering (EC) 2020
A single crystal intrinsic semiconductor is at temp of 300 K with effective density of states for holes twice that of electrons. VT = 26 mV. The intrinsic Fermi level is shifted from mid bond gap energy level by
PYP
Electronics & Communication Engineering (EC) 2020
The random variable
Where And W(t) is a real white Gaussian noise process with two-sided power spectral density SW(f) = 3 W/Hz, for all f. The variance of Y is
Where And W(t) is a real white Gaussian noise process with two-sided power spectral density SW(f) = 3 W/Hz, for all f. The variance of Y is
PYP
Electronics & Communication Engineering (EC) 2020
The two sides of a fair coin are labelled as 0 and A. The coin is tossed two times independently. Let M and N denote the labels corresponding to the outcomes of those tosses. For a random variable X, defined as X = min(M,N), the expected value E(X) (rounded off to two decimal places) is .
PYP
Electronics & Communication Engineering (EC) 2020
The figure below shows a multiplexer where S1 and S0 are the select lines, I0 to I3 are the input data lines. EN is the enable line, and F (P, Q, R) is the output. F is
PYP
Electronics & Communication Engineering (EC) 2020
A digital communication system transmits a block of N bits. The probability of error in decoding a bit is a α. The error event of each bit is independent of error events of other bits. The received block is declared erroneous if at least one of the bits is decoded wrongly. The probability that the received block is erroneous is
PYP
Electronics & Communication Engineering (EC) 2020
The loop transfer function of a negative feedback system is
The value of K, for which the system is marginally stable, is …….. .
The value of K, for which the system is marginally stable, is …….. .
PYP
Electronics & Communication Engineering (EC) 2020
In the circuit shown below all component ideal, input voltage is sinusoidal. Magnitude of steady state output Vo is ___________ V.
PYP
Electronics & Communication Engineering (EC) 2020
The output y[n] of a discrete-time system for an input x[n] is
The unit impulse response of the system is
The unit impulse response of the system is
PYP
Electronics & Communication Engineering (EC) 2020
Which one of the following pole-zero plots corresponds to the function of an LTI system characterized by the input-output difference equation given below?
PYP
Electronics & Communication Engineering (EC) 2020
If v1, v2,...,v6 are six vectors in R4, which one of the following statements is FALSE?
PYP
Electronics & Communication Engineering (EC) 2020
The general solution of is
PYP
Electronics & Communication Engineering (EC) 2020
The current in the RL-circuit shown below is i(t) = The value of the inductor (rounded off to two decimal places) is ……. H.
PYP
Electronics & Communication Engineering (EC) 2020
in the circuit shown below, all the components are ideal. If Vi is +2V, the current I0 sourced by the op-amp is …… mA
PYP
Electronics & Communication Engineering (EC) 2020
A 10-bit D/A converter is calibrated over full range from 0 to 10 V. If input to D/A converter is 13A (in hexadecimal number). Then output voltage is ________ V.
PYP
Electronics & Communication Engineering (EC) 2020
In 8085 microprocessor, number of address lines required to access 16K byte memory bank?
PYP
Electronics & Communication Engineering (EC) 2020
The pole-zero map of a rational function G(s) is shown below. When the closed contour Γ is mapped into the G(s)-plane, then the mapping encircles.
PYP
Electronics & Communication Engineering (EC) 2020
A binary random variable X takes the value +2 or -The probability P(X = +2) = α. The value of α (rounded off to one decimal place), for which the entropy of X is maximum, is
PYP
Electronics & Communication Engineering (EC) 2020
The impedances Z = jX, for all X in the range (—∞,∞), map to the Smith chart as
PYP
Electronics & Communication Engineering (EC) 2020
The partial derivative of the function
F(x, y, z) = e1-x cos y + xze-1/(1+y2)
With respect to x at the point (1, 0, e) is
Option
F(x, y, z) = e1-x cos y + xze-1/(1+y2)
With respect to x at the point (1, 0, e) is
Option
PYP
Electronics & Communication Engineering (EC) 2020
The components in the circuit shown below are ideal.
If the Op-amp is in positive feedback and the input voltage Vi is a sine wave of amplitude 1V, V0 = ?
If the Op-amp is in positive feedback and the input voltage Vi is a sine wave of amplitude 1V, V0 = ?
PYP
Electronics & Communication Engineering (EC) 2020
For a vector field , Which one of the following is false
PYP
Electronics & Communication Engineering (EC) 2020
In a digital communication system, a symbol S randomly chosen from the set {s1,s2,s3,s4} is transmitted. It is given that s1 = -3, s2 = -1, s3 = +1 and s4 = +The received symbol is Y = S + W. W is a zero-mean unit-variance Gaussian random variable and is independent of S. P, is the conditional probability of symbol error for the maximum likelihood (ML) decoding when the transmitted symbol S = si. The index i for which the conditional symbol error probability Pi is the highest is …….
PYP
Electronics & Communication Engineering (EC) 2020
The characteristic equation of a system is
s3 + 3s2 + (K + 2)s + 3K = 0
In the root locus plot for the given system, as K varies from 0 to ∞, the break-away or break-in point(s) lie within
s3 + 3s2 + (K + 2)s + 3K = 0
In the root locus plot for the given system, as K varies from 0 to ∞, the break-away or break-in point(s) lie within
PYP
Electronics & Communication Engineering (EC) 2020
For the modulated signal , the message signal and the carrier frequency fc is 1 MHz. The signal x(t) is passed through a demodulator, as shown in the figure below. The output y(t) of the demodulator is
PYP
Electronics & Communication Engineering (EC) 2020
The band diagram of a p-type semiconductor with a band-gap of 1eV is shown. Using this semiconductor, a MOS capacitor having VTH of -0.16 V, C’ox of 100 nF/cm2 and a metal work function of 3.87 eV is fabricated. There is no charge within the oxide. If the voltage across the capacitor is VTH, the magnitude of depletion charge per unit area (in C/cm2) is
PYP
Electronics & Communication Engineering (EC) 2020
The transfer function of a stable discrete time LTI system is , where K and α → real no. The value of α = ? with |α| > 1, for which magnitude rest one of the system to constant over all frequency.
PYP
Electronics & Communication Engineering (EC) 2020
A finite duration discrete time signal x(n) is obtained by sampling the continuous time signal,
x(t) = cos (200 πt) at sampling instants,The 8-point DFT and x[n] is defined as
Which is true?
x(t) = cos (200 πt) at sampling instants,The 8-point DFT and x[n] is defined as
Which is true?
PYP
Electronics & Communication Engineering (EC) 2020
The state diagram of a sequence detector is shown below. State S0 is the initial state of the sequence detector. If the output is 1, then
PYP
Electronics & Communication Engineering (EC) 2020
For the given circuit, which one of the following is the correct state question?
PYP
Electronics & Communication Engineering (EC) 2020
Consider the following system of linear equation Which one of the following conditions ensures that a solution exists for the above system?:
PYP
Electronics & Communication Engineering (EC) 2020
An enhancement MOSFET of threshold voltage 3 V is being used in the sample and hold circuit given below. Assume that the substrate of MOS device is connected to -10 V. If the input voltage V1 lies between 10 V, the minimum and the maximum values of VG required of proper sampling and holding respectively, are
PYP
Electronics & Communication Engineering (EC) 2020
Which one of the following options contains two solutions of the differential equation ?
PYP
Electronics & Communication Engineering (EC) 2020
is the Fourier transform of x(t) shown below. The value of (rounded off to two decimal places) is ……… .
PYP
Electronics & Communication Engineering (EC) 2020
The current I in the given network is
PYP
Electronics & Communication Engineering (EC) 2020
The magnetic field of a uniform plane wave in vacuum is given by
The value of b is …… .
The value of b is …… .
PYP
Electronics & Communication Engineering (EC) 2020
SPM(t) and SFM(t) as defined below, are the phase modulated and frequency modulated waveforms, respectively, corresponding to the message signal m(t) shown in the figure.
and Where Kp is the phase deviation constant in radians/volt and Kf is the frequency deviation constant in radians/second/volt. If the highest instantaneous frequencies of SPM(t) and SFM(t) are same, then the value of the ratio is …… seconds.
and Where Kp is the phase deviation constant in radians/volt and Kf is the frequency deviation constant in radians/second/volt. If the highest instantaneous frequencies of SPM(t) and SFM(t) are same, then the value of the ratio is …… seconds.
PYP
Electronics & Communication Engineering (EC) 2020
For a 2-port network consisting an ideal lossless transformer, the parameter S21, (rounded off to two decimal places) for a reference impedance of , is …… .
PYP
Electronics & Communication Engineering (EC) 2020
P,Q and R are the decimal integers corresponding to the 4-bit binary number 1100 considered in signed magnitude, 1’s complement, and 2’s complement representations, respectively. The 6-bit 2’s complement representation of (P + Q + R) is
PYP
Electronics & Communication Engineering (EC) 2020
A pn junction solar cell of area 1.0 cm2, illuminated uniformly with 100mW cm-2, has the following parameters: Efficiency = 15%, open circuit voltage = 0.7 V, fill factor = 0.8, and thickness = 200 . The charge of an electron 1.6 × 10-19 C. The average optical generation rate (in cm-3s-1) is
PYP
Electronics & Communication Engineering (EC) 2020
Using the incremental low frequency small-signal model of the MOS device, the Norton equivalent resistance of the following circuit is
PYP
Electronics & Communication Engineering (EC) 2020
For the BJT in the amplifier shown below, VBE = 0.7 V, kT /q= 26 mV. Assume that BJT output resistance (ro) is very high and the base current is negligible. The capacitors are also assumed to be short circuited at signal frequencies. The input is direct coupled. The low frequency voltage gain of the amplifier is
PYP
Electronics & Communication Engineering (EC) 2020
For an infinitesimally small dipole in free space, the electric field in the far field proportional to (e-jkr/r) , where . A vertical infinitesimally small electric dipole is placed at a distance h(h > 0) above an infinite ideal conducting plane, as shown in the figure. The minimum value of h, for which one of the maxima in the far field radiation pattern occurs at , is
PYP
Electronics & Communication Engineering (EC) 2020
For the solid S shown below, the of (rounded off to two decimal places ) is …… .
PYP
Electronics & Communication Engineering (EC) 2020
A system with transfer function is subjected to an input 5 cos 3t. The steady state output of the system is The value of a is ……
PYP
Electronics & Communication Engineering (EC) 2020
The base of an npn BJT T1 has a linear doping profile NB(x) as shown below, The base of another npn BJT T2 has a uniform doping NB of 1017 cm-C. All other parameters are identical for both the devices. Assuming that the hole density profile is the same as that of doping, the common-emitter current gain of T2 is
PYP
Electronics & Communication Engineering (EC) 2020
For the components in the sequential circuit shown below, tpd is the propagation delay, tsetup is the setup time, and thold is the hold time. The maximum clock frequency (rounded off to the nearest integer), at which the given circuit can operate reliably, is …. MHz.
PYP
Electronics & Communication Engineering (EC) 2020
In the voltage regulator shown below, V1 is the unregulated at 15 V. Assume VBE = 0.7 V and the base current is negligible for both the BJTs. If the regulated output Vo is 9 V, the value of R2 is ……. .
PYP
Electronics & Communication Engineering (EC) 2020
The components in the circuit given below are ideal. If R = 2 and C = 1 the -3 dB cut-off frequency of the circuit in Hz is
PYP
Electronics & Communication Engineering (EC) 2020
A one-sided abrupt pn junction diode has a depletion capacitance CD of 50 PF at reverse bias of 0.2 V. The plot of 1/CD2 versus the applied voltage V for this diode is a straight line as shown in the below. The slope of the plot is …… × 1020 F-2V-1
PYP
Electronics & Communication Engineering (EC) 2020
X is random variable with uniform probability density function in the interval [-2, 10]. For Y = 2X –6, the conditional probability (rounded off to three decimal places) is ….. .
PYP
Electronics & Communication Engineering (EC) 2020
Consider the following closed loop control system
Where and . If the steady state error for a unit ramp is 0.1, then the value of K is …… .
Where and . If the steady state error for a unit ramp is 0.1, then the value of K is …… .
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