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Practice Test: Electronics Engineering (ECE)- 4 - Electronics and Communication Engineering (ECE) MCQ


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30 Questions MCQ Test GATE ECE (Electronics) Mock Test Series 2025 - Practice Test: Electronics Engineering (ECE)- 4

Practice Test: Electronics Engineering (ECE)- 4 for Electronics and Communication Engineering (ECE) 2024 is part of GATE ECE (Electronics) Mock Test Series 2025 preparation. The Practice Test: Electronics Engineering (ECE)- 4 questions and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus.The Practice Test: Electronics Engineering (ECE)- 4 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)- 4 below.
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Practice Test: Electronics Engineering (ECE)- 4 - Question 1

Choose the word or phrase which is nearest in meaning to the key word Lethargy

Practice Test: Electronics Engineering (ECE)- 4 - Question 2

The following question comprise two words that have a certain relationship between them followed by four pairs of words. Select the pair that has same relationship as the original pair of words.
Break : Piece

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Practice Test: Electronics Engineering (ECE)- 4 - Question 3

Replace the phrase printed in bold to make it grammatically correct ?
"Even though many companies" are now penetrating rural India, it would help to give India a real chance of witnessing a double digit GDP growth.

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

Improve the sentence with suitable options by replacing the underlined word.
He is still in vigorous health although he is on the "right" side of sixty.

Practice Test: Electronics Engineering (ECE)- 4 - Question 5
Complete the given sentence by choosing the correct phrase.
You cannot succeed unless
Practice Test: Electronics Engineering (ECE)- 4 - Question 6
Chirag decided to give 12% of his salary to his younger brother as a pocket money. But he gave 1260 Rs which was 60% of what he had decided earlier. How much is Chirag’s salary?
Detailed Solution for Practice Test: Electronics Engineering (ECE)- 4 - Question 6
Let x be Chirag’s salary:

x = 17500 Rs
Practice Test: Electronics Engineering (ECE)- 4 - Question 7
Two pipes can fill a tank in 15 minutes and 25 minutes respectively. Both the pipes are opened together and after some time, the first pipe is closed and the tank is completely full in 15 minutes. For how many minutes is the first pipe opened?
Detailed Solution for Practice Test: Electronics Engineering (ECE)- 4 - Question 7

t = 6 min.
Practice Test: Electronics Engineering (ECE)- 4 - Question 8
A and B are required to solve a problem independently. If 1/2 and 1/3 are their respectively probabilities of solving the problem, then the probability that atleast one of them solves the problem.
Detailed Solution for Practice Test: Electronics Engineering (ECE)- 4 - Question 8
Probability that atleast one of them solves the problem = P
Practice Test: Electronics Engineering (ECE)- 4 - Question 9
What is the probability that a leap year has 53 Sundays and 52 Mondays?
Detailed Solution for Practice Test: Electronics Engineering (ECE)- 4 - Question 9
In leap year there are 366 days.
There are 52 weeks + 2 days
1. - Mon. + Tue.
2. - Tue. + Wed.
3. - Wed. + Thu.
4. - Thu. + Fri.
5. - Fri. + Sat.
6. - Sat. + Sun. = 53 Sundays + 52 Mondays
7. - Sun. + Mon.
Probability =1/7
Practice Test: Electronics Engineering (ECE)- 4 - Question 10
A certain sum of money is invested for one year at a certain rate of simple interest. If the rate of interest is 3% higher, then the interest earned will be 25% more than the interest earned earlier. What is the earlier rate of interest ?
Detailed Solution for Practice Test: Electronics Engineering (ECE)- 4 - Question 10

r = 12% per annum
Practice Test: Electronics Engineering (ECE)- 4 - Question 11
The circuit shown below is driven by a sinusoidal input The steady state output is
Detailed Solution for Practice Test: Electronics Engineering (ECE)- 4 - Question 11
Practice Test: Electronics Engineering (ECE)- 4 - Question 12
Determine the value of load resistance ,so that it receive maximum power from the circuit.
Detailed Solution for Practice Test: Electronics Engineering (ECE)- 4 - Question 12
Practice Test: Electronics Engineering (ECE)- 4 - Question 13
A plant has the following transfer function, For an unit step input determine the time required so that response will settle in 2% of its final value.
Detailed Solution for Practice Test: Electronics Engineering (ECE)- 4 - Question 13
Practice Test: Electronics Engineering (ECE)- 4 - Question 14
The open loop transfer function of an unity feedback control system is G(S) = What is the range of K so that closed loop system becomes stable ?
Detailed Solution for Practice Test: Electronics Engineering (ECE)- 4 - Question 14
Characteristics equation
= K + S(S+1) (S + 5) = 0

Rough-array

So for stable system K > 0 and

30 – k > 0
k < 30
so    0 < k < 30
Practice Test: Electronics Engineering (ECE)- 4 - Question 15
Determine the peak inverse voltage that appear across the diode in the given circuit.
Detailed Solution for Practice Test: Electronics Engineering (ECE)- 4 - Question 15

During positive half cycle capacitor get charge and during negative half cycle the equivalent circuit is shown as
Practice Test: Electronics Engineering (ECE)- 4 - Question 16

Determine the power dissipated across the load resistance RL in the given circuit, assume diode is ideal.

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 4 - Question 16


                                   
                               = 125 mw

Practice Test: Electronics Engineering (ECE)- 4 - Question 17
What is the load current in the circuit shown below:
Detailed Solution for Practice Test: Electronics Engineering (ECE)- 4 - Question 17



                                          = – 10mA
Practice Test: Electronics Engineering (ECE)- 4 - Question 18
How many standard resistor are required to design a 3 bit flash type ADC?
Detailed Solution for Practice Test: Electronics Engineering (ECE)- 4 - Question 18

                                     = 8
Practice Test: Electronics Engineering (ECE)- 4 - Question 19
Determine the size of ROM required to implement a full-substractor.
Detailed Solution for Practice Test: Electronics Engineering (ECE)- 4 - Question 19
For full-substractor, the number of input variable is 3 and output function are 2 So size of ROM,
Practice Test: Electronics Engineering (ECE)- 4 - Question 20
Determine the even part of the signal x(f) where x(t) = 4 Sin t
Detailed Solution for Practice Test: Electronics Engineering (ECE)- 4 - Question 20
x(t) = 4 sint
Since the above signal is an odd signal therefore, its even part is zero.
Practice Test: Electronics Engineering (ECE)- 4 - Question 21
An LTI system is characterized by difference equation y (n) = y (n-1) + x (n). The impulse response of the system is :
Detailed Solution for Practice Test: Electronics Engineering (ECE)- 4 - Question 21
y(n) = y(n – 1) + x(n)
Practice Test: Electronics Engineering (ECE)- 4 - Question 22
Consider the signal Let  denotes the Fourier transform of the signal, the value of is
Detailed Solution for Practice Test: Electronics Engineering (ECE)- 4 - Question 22
Practice Test: Electronics Engineering (ECE)- 4 - Question 23
In the given circuit, the forward threshold voltage of the diode is 0.7 and maximum power dissipation across the diode is 21mW. Determine the value of resistance R for safe operation.
Detailed Solution for Practice Test: Electronics Engineering (ECE)- 4 - Question 23


Practice Test: Electronics Engineering (ECE)- 4 - Question 24
When a bypass capacitor is connected across the emitter and resistance of a common-emitter BJT amplifier:
Practice Test: Electronics Engineering (ECE)- 4 - Question 25
An amplifier using an op-amp with a slew rate 1 has a gain of 20 dB. If the peak value of sinusoidal input signal is 1 V then determine the maximum frequency of the input signal that can be amplify without any distortion.
Detailed Solution for Practice Test: Electronics Engineering (ECE)- 4 - Question 25
For distortion less output,
Practice Test: Electronics Engineering (ECE)- 4 - Question 26
The skin depth of copper at a frequency of 6GHz is 1the skin depth at a frequency of 24 GHz would be :
Detailed Solution for Practice Test: Electronics Engineering (ECE)- 4 - Question 26
Practice Test: Electronics Engineering (ECE)- 4 - Question 27
An air filled rectangular waveguide with dimension where b < a < 2b is to be constructed to operate at 3GHz in dominant mode. The design frequency is at least 20% higher than the cut-off frequency of dominant mode and also at least 20% below, cut off frequency of next higher mode, determine the phase velocity.
Detailed Solution for Practice Test: Electronics Engineering (ECE)- 4 - Question 27

Practice Test: Electronics Engineering (ECE)- 4 - Question 28

An FM signal for broadcast in the 88-108 MHz range, band has a frequency deviation of 15 kHz. Find the% modulation of this signal

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 4 - Question 28

Practice Test: Electronics Engineering (ECE)- 4 - Question 29
Auto correlation function of a random signal with zero mean is given as The rms value of the AC component of the signal will be
Detailed Solution for Practice Test: Electronics Engineering (ECE)- 4 - Question 29
Practice Test: Electronics Engineering (ECE)- 4 - Question 30

An angle modulated signal is given as, considering s(t) is an FM signal and message signal m(t) is 10 then determine the value of

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 4 - Question 30

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