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Practice Test: Electronics Engineering (ECE)- 7 - Electronics and Communication Engineering (ECE) MCQ


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65 Questions MCQ Test - Practice Test: Electronics Engineering (ECE)- 7

Practice Test: Electronics Engineering (ECE)- 7 for Electronics and Communication Engineering (ECE) 2024 is part of Electronics and Communication Engineering (ECE) preparation. The Practice Test: Electronics Engineering (ECE)- 7 questions and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus.The Practice Test: Electronics Engineering (ECE)- 7 MCQs are made for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Practice Test: Electronics Engineering (ECE)- 7 below.
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Practice Test: Electronics Engineering (ECE)- 7 - Question 1

The following plot shows a function y which varies linearly with x, the value of the integral of  

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Practice Test: Electronics Engineering (ECE)- 7 - Question 2

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Practice Test: Electronics Engineering (ECE)- 7 - Question 3

The residues of the complex function

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Practice Test: Electronics Engineering (ECE)- 7 - Question 4

A and B throw a pair cf dice alternately. A wins if he throws 6 before B throws 7 and B wins if he throws 6 before A throws 7. A begins. Find the probability of A losing.

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Practice Test: Electronics Engineering (ECE)- 7 - Question 5

Identify which one of the following is not a tree of the graph shown in the figure

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 7 - Question 5

abfg forms e loop and is not a tree of the graph. Definition of tree: A tree is a connected subgraph of a connected graph containing all the nodes of the graph but containing no loops.   

Practice Test: Electronics Engineering (ECE)- 7 - Question 6

In the circuit below the voltage v(t) is _______________

.

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Practice Test: Electronics Engineering (ECE)- 7 - Question 7

The admittance parameter Y12 in the two port network is ______________ .

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Practice Test: Electronics Engineering (ECE)- 7 - Question 8

A common emitter amplifier shown in the figure is biased using a 1 mA ideal current source. The approximate base current value is 

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Practice Test: Electronics Engineering (ECE)- 7 - Question 9

A 555 astable oscillator with R1 = 40 kΩ, R2 = 120 kΩ and C = 4.0 μF will oscillate at

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Practice Test: Electronics Engineering (ECE)- 7 - Question 10

The CMRR of the differential amplifier circuit shown is equal to

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Practice Test: Electronics Engineering (ECE)- 7 - Question 11

Heat sinks are used in power amplifier circuits

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Practice Test: Electronics Engineering (ECE)- 7 - Question 12

A circuit using an op - AMP is shown in the given figure it has

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 7 - Question 12

Since the feedback current is proportional to the output voltage, it is a voltage shunt feedback amplifier.

Practice Test: Electronics Engineering (ECE)- 7 - Question 13

The number of unused states in a 4-bit Johnson counter is _____________

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Practice Test: Electronics Engineering (ECE)- 7 - Question 14

If the output of a logic gate is ‘1’ when all its inputs are at logic 'O' then the gate is either

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Practice Test: Electronics Engineering (ECE)- 7 - Question 15

When two non - linear systems S1 and S2 are connected in cascade the overall system is

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 7 - Question 15

Y(t) - Si * S2 = linear
Exponential of any signal as non - linear
logarithm of any signal is non - linear
When two linear systems are connected in cascaded the
system is non - linear
Sim tarty two non linear systems are connected in cascaded then the system is linear

Practice Test: Electronics Engineering (ECE)- 7 - Question 16

The discrete time fourier transform of signal

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Practice Test: Electronics Engineering (ECE)- 7 - Question 17

y(t) = x(t) * h(t) then Express z(t)

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Practice Test: Electronics Engineering (ECE)- 7 - Question 18

The gain margin of a unity feedback control system with the open loop transfer function 

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Practice Test: Electronics Engineering (ECE)- 7 - Question 19

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 7 - Question 19

Transfer function of lag compensator Is in the form of T(s)

Practice Test: Electronics Engineering (ECE)- 7 - Question 20

The open-loop transfer function of a feedback control system is    The break-away point of its root locus plot 

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Practice Test: Electronics Engineering (ECE)- 7 - Question 21

A signal m(t) is multiplied by cosine wave form of frequency fc., (m(t) is not a sinusoidal) if fourier transform of m(t) is M(f), then the fourier transform of the product is

Practice Test: Electronics Engineering (ECE)- 7 - Question 22

Autocorrelation of Non periodic wave form of finite energy and its energy spectral density are

Practice Test: Electronics Engineering (ECE)- 7 - Question 23

Hilbert transform of a signal is

Practice Test: Electronics Engineering (ECE)- 7 - Question 24

The magnetic field intensity vector of a plane wave is given by H (x, y, z, t) = 10 sin (1000t + 0.002x + 20) ay where ay denotes the unit vector in y-direction. The wave propagating with a phase velocity

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Practice Test: Electronics Engineering (ECE)- 7 - Question 25

Distilled water at 35°C is characterized by    2GHz then its loss tangent is

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Practice Test: Electronics Engineering (ECE)- 7 - Question 26

The orthogonal trajectory of the family of curves xy = k2 is

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Practice Test: Electronics Engineering (ECE)- 7 - Question 27

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Practice Test: Electronics Engineering (ECE)- 7 - Question 28

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Practice Test: Electronics Engineering (ECE)- 7 - Question 29

Solve the partial differential equation pe2y = qe2x.

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Practice Test: Electronics Engineering (ECE)- 7 - Question 30

The current I in the figure shown below is?

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Practice Test: Electronics Engineering (ECE)- 7 - Question 31

In the circuit shown below, the value of R is

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Practice Test: Electronics Engineering (ECE)- 7 - Question 32

Impedance matrix for the two-port network shown in the figure is

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Practice Test: Electronics Engineering (ECE)- 7 - Question 33

In the following figure, if VDD = +10 V and -V = -10 V, what ratio of R2: R1 should be used to obtain VGs = 8.5 V.

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Practice Test: Electronics Engineering (ECE)- 7 - Question 34

Determine the thevenin equivalent circuit for the transistor network, external to the resistor RL (i.e. between terminals A and B) Input Impedance of base = 2.3 kΩ, β = 100.

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 7 - Question 34

For DC conditions VL = 0
AC equivalent circuit for the given network consist of 2 3 kn resistor and controlled current source whose magnitude is 100 times the current I1

Transistor equivalent circuit
From the above equivalent circuit Zth, = 3kΩ

Practice Test: Electronics Engineering (ECE)- 7 - Question 35

A class B push pull power amplifier is supplied with Vcc = 50V. The signal swings the collector voltage down to Vmin = 5V. The total dissipation in both transistors is 40W. Find conversion efficiency.

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Practice Test: Electronics Engineering (ECE)- 7 - Question 36

For the circuit shown in the following the capacitor C is initially uncharged. At t = 0 the switch is closed. The voltage Vc across the capacitor at t = 1 ms is ?

Op AMP supply with ±15 V & the ground has been shown.

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Practice Test: Electronics Engineering (ECE)- 7 - Question 37

Boolean expression for the shaded area in the given venn diagram is

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 7 - Question 37

AB + BC + CA

Practice Test: Electronics Engineering (ECE)- 7 - Question 38

The following sequence of instructions is executed by an 8085 microprocessor.

1000 LXI SP, 27FF

1003 CALL

1006 1006 POPH

What are the contents of the stack pointer (SP) and the HL register pair after completion of execution of these instructions?

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Practice Test: Electronics Engineering (ECE)- 7 - Question 39

The circuit shown use JFET with gm = 3000 μs, the value of Av is ____________

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Practice Test: Electronics Engineering (ECE)- 7 - Question 40

To which one of the following difference equationsthe impulse response,

h(n) = δ(n + 2) - δ(n - 2) corresponds to?

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Practice Test: Electronics Engineering (ECE)- 7 - Question 41

Which one of the following is the correct statement forThe continuous time system described by y(t) = x(t2)

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 7 - Question 41

it is linear because it has no square of signal, it is non-causal because input depends on future value.
It does not satisfy two rules so it is time- variable.

Practice Test: Electronics Engineering (ECE)- 7 - Question 42

In LTI system the values of a and b for the impulse response-is

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Practice Test: Electronics Engineering (ECE)- 7 - Question 43

A system has an open-loop transfer function of    and it has a feedback whose transfer function is H(s) = 1 + Ts. What should be the value of T so that the dosed-loop system operates in a stable manner? 

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 7 - Question 43

Characteristic equation of the system is given by 

For the system to be stable, the elements of first column of rotith array must be zero.

Practice Test: Electronics Engineering (ECE)- 7 - Question 44

A feed back control system is described by    input, the steady state error is ______________.

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Practice Test: Electronics Engineering (ECE)- 7 - Question 45

The tuned circuit of the Oscillator in a simple AM transmitter employs a 50μH coil and 2nF capacitor. If the output of oscillator is modulated by Audio frequency 10KHz, what is the range of side bands,

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 7 - Question 45

Since the highest modulated frequency is 10KHz, the frequency range occupied by the sidebands will range from 10 KHz above and below the earner extending from 513.3 KHz to 493.3 KHz.

Practice Test: Electronics Engineering (ECE)- 7 - Question 46

The SNR of an FM limiter - descriminator demodulator is? When input signal strength = 0.5W, maximum frequency deviation = 60 k Hz, base band signal cut off frequency = 15Khz, received white Gaussian noise power sprectral density = 10-8 W/Hz and the average power of modulating signal is = 0.1W

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 7 - Question 46

Practice Test: Electronics Engineering (ECE)- 7 - Question 47

Match list - I (laws) with list - n (applications) and select the correct answer using the codes given below the lists

Codes: 

a   b   c   d

Practice Test: Electronics Engineering (ECE)- 7 - Question 48

The reflection coefficient is

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Practice Test: Electronics Engineering (ECE)- 7 - Question 49

The intrinsic impedance of the region z > 0 is

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Practice Test: Electronics Engineering (ECE)- 7 - Question 50

Use given above data and find Fi

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F1=Sum of FA

Practice Test: Electronics Engineering (ECE)- 7 - Question 51

Use above data and find F2

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F2= Carry of FA

Practice Test: Electronics Engineering (ECE)- 7 - Question 52

A discrete source transmits meriages X1, X2, X3, with the probability 0.3, 0.4, 0.3, given in figure.

Q.

Then H(X, Y) is

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Practice Test: Electronics Engineering (ECE)- 7 - Question 53

A discrete source transmits meriages X1, X2, X3, with the probability 0.3, 0.4, 0.3, given in figure.

H(Y/X) is

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Practice Test: Electronics Engineering (ECE)- 7 - Question 54

For the continuous signal x(t) shown in the fig draw The following signals

Q.

What is the signal x(-t)

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The signal Is a folded signal. so

Practice Test: Electronics Engineering (ECE)- 7 - Question 55

 

For the continuous signal x(t) shown in the fig draw The following signals

   

What is the x(-(t + 1))

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Practice Test: Electronics Engineering (ECE)- 7 - Question 56

China’s rising economic clout and assertiveness isbeing viewed with some  ____________  in the neighbouring regions.

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 7 - Question 56

The words 'clout’ and ‘assertiveness’ point to fear or ■trepidation'.  

Practice Test: Electronics Engineering (ECE)- 7 - Question 57

Combining the protection and use of heritage structures with the demands of rapid urbanization has become a ___________________   .

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 7 - Question 57

Nuisance and trial can easily be ruled out because of their negative connotation which is not indicated in the sentence. 'A difficulty’ should be followed by a qualifying phrase and cannot end the sentence. Hence only challenge is suitable.

Practice Test: Electronics Engineering (ECE)- 7 - Question 58

Select the word that is SIMILAR in meaning to the head word.

CONSIDERED

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 7 - Question 58

Considered means ‘understood’, or 'regarded'.

Practice Test: Electronics Engineering (ECE)- 7 - Question 59

The question below consists of a pair of related words followed by four pairs of words. Select the pair that shares a similar relationship as the original pair.

MUSICIAN : BAND

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 7 - Question 59

A musician conducts a band and but he doesn’t create it. Similarly, a scientist conducts experiments. Except choice 4 all the options show a creator/creation relationship.

Practice Test: Electronics Engineering (ECE)- 7 - Question 60

Select the correct alternative from the given choices.

Five friends - Pompom, Tultul, Tutun, Babul and Parul, are standing in a row in increasing order of their heights from right to left Neither Babul nor Tutun is standing at any of the extreme ends. Parul is not taller than Tultul. Parul has as many persons not taller than him as Tultul has as many persons not shorter than him. Which of the following is definitely true?

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 7 - Question 60

From the given information, it is clear that as Babul and Tutun are not at any of the extreme ends, so Parul and Tultul must be at extreme ends. As, Parul is shorter than Tultul, Tultul is the tallest

Practice Test: Electronics Engineering (ECE)- 7 - Question 61

How many times should the keys of a type writer be pressed in order to type the first 299 natural numbers? (No spaces are left between the numbers)

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 7 - Question 61

To type single-digit natural numbers from 1 to 9, 9 keys must be pressed. To type two-digit natural numbers from 10 to 99, the keys of the typewriter must be pressed 90 x 2 = 180 times.
To type the 200 three-digit numbers from 100 to 299, the keys of the type writer must be pressed 3 x 200 = 600 times. Hence, the total number of times the keys of the type writer must be pressed = 9 + 180 + 600 = 789 „

Practice Test: Electronics Engineering (ECE)- 7 - Question 62

The details of area, total population, urban population and the number of literate of certain states are given in the following table. Study the table and answer the questions that follow.

Q.

In all the states whose population of literates is more than 110 lakhs but less than 305 lakhs, which state has the highest density of population?

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 7 - Question 62

There are many states that satisfy the given condition of literates, hence it is better to focus on the states in the given choices. The density of population in

Practice Test: Electronics Engineering (ECE)- 7 - Question 63

The details of area, total population, urban population and the number of literate of certain states are given in the following table. Study the table and answer the questions that follow.

Q.

What is the literacy rate of the state which has the third highest rural population? (in lakhs)

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 7 - Question 63

Madhya Pradesh has the third highest rural population. The literacy rate of Madhya Pradesh

Practice Test: Electronics Engineering (ECE)- 7 - Question 64

Only if X works, then W works. Unless Y works, W works. If Z does not work, then Y works. Who among W, X, Y and Z, if not working, can definitely lead to the conclusion that the other three are definitely working?

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 7 - Question 64

So we can say that if Y is not working then W, X and Z all are working.

Practice Test: Electronics Engineering (ECE)- 7 - Question 65

The following question has a paragraph followed by four alternative ways of summarising the same. Choose the option that best captures the essence of the paragraph.

Within the last decade, there has emerged a second generation of “modernist’ critics which has been far less interested in sketching the broad outlines of a modernist movement; instead, they want to expose the diversity within “modernism’ and to explore ‘modernism’s’ institutional alliances and strategies.

That is, to what degree was “modernism" selfconsciously constructed by its practitioners and by its critics, and how did various social and market forces help shape the practices of “modernism"? Or, as the editors of Modem Art and Modernism phrase it, the task now is “to examine both the circumstances under which modem art has been produced, and those under which critical theories and forms of interpretation have themselves been produced."
a.    The second generation of modernist critics that has become prominent during the last decade, has focussed on delineating the broad contours of the modernist movement. They have also attempted to shed light on the various influences on this genre.
b.    A second generation of modernist critics that has emerged during the last decade, seeks to understand the diversity in modernism and the factors and circumstances underlying it.
c.    A second generation of modernist critics as exemplified by the editors of ‘Modern Art and Modernism’ are attempting to understand the various market forces that have shaped modernism durina the last decade.

d. A second generation of modernist critics who have emerged during the last decade has attempted to self-consciously construct modernism as done by its practitioners and critics. They have also attempted to outline the salient aspects of modernism.

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 7 - Question 65

The paragraph focusses on the area of study of modernist critics. They are interested in the diversity in modernism and how it came about. Choice (B) captures this. Choice (A) is factually incorrect and so is choice (D). Choice (C) is incomplete.   

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