What are the questions asked in GATE 2018 Electronics and Communication Engineering exam?

Complete set of questions from GATE 2018 ECE exam covering Network Theory, Analog Circuits, Digital Electronics, Signals and Systems, Control Systems, Communication Systems, Electromagnetic Theory, Electronic Devices, and more with detailed solutions.

Where can I download GATE 2018 Electronics and Communication question paper?

You can download the complete GATE 2018 Electronics and Communication Engineering question paper with solutions from ExamPrev. The PDF includes all questions with detailed explanations.

How many questions were in GATE 2018 ECE paper?

GATE 2018 Electronics and Communication Engineering paper consisted of 65 questions including MCQs, MSQs, and numerical answer type questions covering all major ECE topics.

Are solutions provided for GATE 2018 ECE questions?

Yes, detailed step-by-step solutions with explanations are provided for all questions from GATE 2018 Electronics and Communication Engineering paper.

What topics are covered in GATE 2018 ECE paper?

GATE 2018 ECE covers Network Theory, Electronic Devices, Analog Circuits, Digital Electronics, Signals and Systems, Control Systems, Communication Systems, Electromagnetic Theory, Microprocessors, VLSI Design, and Engineering Mathematics.

Electronics and Communication Gate 2018 Questions with Answer

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Ques 53 GATE 2018

A coastal region with unparalleled beauty is home to many species of animals. It is dotted with coral reefs and unspoilt white sandy beaches. It has remained inaccessible to tourists due to poor connectivity and lack of accommodation. A company has spotted the opportunity and is planning to develop a luxury resort with helicopter service to the nearest major city airport. Environmentalists are upset that this would lead to the region becoming crowded and polluted like any other major beach resorts. Which one of the following statements can be logically inferred from the information given in the above paragraph?

The culture and tradition of the local people will be influenced by the tourists.

The region will become crowded and polluted due to tourism.

The coral reefs are on the decline and could soon vanish.

Helicopter connectivity would lead to an increase in tourists coming to the region.

(d) is the correct answer.

Ques 54 GATE 2018

The ABCD matrix for a two-port network is defined by:

The parameter B for the given two-port network (in ohms, correct to two decimal places) is

(5) is the correct answer.

Ques 55 GATE 2018

For the circuit given in the figure, the voltage V_c (in volts) across the capacitor is

1.25√2sin(5t-0.25π)

1.25√2sin(5t-0.125π)

2.5√2sin(5t-0.25π)

2.5√2sin(5t-0.125π)

Ques 56 GATE 2018

For the circuit given in the figure, the magnitude of the loop current (in amperes, correct to three decimal places) 0.5 second after closing the switch is

(0.31) is the correct answer.

Ques 57 GATE 2018

Consider the network shown below with R₁=1Ω, R₂=2Ω and R₃=3Ω. The network is connected to a constant voltage source of 11V.

The magnitude of the current (in amperes, accurate to two decimal places) through the source is

(8) is the correct answer.

Ques 58 GATE 2018

Let X₁, X₂, X₃ and X₄ be independent normal random variables with zero mean and unit variance. The probability that X₄ is the smallest among the four is

(0.25) is the correct answer.

Ques 59 GATE 2018

A random variable X takes values -0.5 and 0.5 with probabilities 1/4 and 3/4, respectively. The noisy observation of X is Y=X+Z where Z has uniform probability density over the interval (-1, 1). X and Z are independent. If the MAP rule based detector outputs

then the value of a (accurate to two decimal places) is

(-0.5) is the correct answer.

Ques 60 GATE 2018

Consider a white Gaussian noise process N(t) with two-sided power spectral density S_N(f)=0.5 W/Hz as input to a filter with impulse response 0.5e^-t²/2 (where t is in seconds) resulting in output Y(t). The power in Y(t) in watts is

0.11

0.22

0.33

0.44

(b) is the correct answer.

Ques 61 GATE 2018

A discrete-time all-pass system has two of its poles at 0.25∠0° and 2∠30°. Which one of the following statements about the system is TRUE?

It has two more poles at 0.5∠30° and 4∠0°.

It is stable only when the impulse response is two-sided.

It has constant phase response over all frequencies.

It has constant phase response over the entire z-plane.

(b) is the correct answer.

Ques 62 GATE 2018

Let x(t) be a periodic function with period T=10. The Fourier series coefficients for this series are denoted by a_k, that is x(t)=∑_k=-∞^∞a_ke^jk(2π/T)t. The same function x(t) can also be considered as a periodic function with period T'=40. Let b_k be the Fourier series coefficients when period is taken as T'. If ∑_k=-∞^∞|a_k|=16 then ∑_k=-∞^∞|b_k| is equal to

256

Ques 63 GATE 2018

The input 4sinc(2t) is fed to a Hilbert transformer to obtain y(t), as shown in the figure below: Here sinc(x)=sin(πx)/(πx).

The value (accurate to two decimal places) of ∫_-∞^∞|y(t)|²dt is

(8) is the correct answer.

Ques 64 GATE 2018

A band limited low-pass signal x(t) of bandwidth 5 kHz is sampled at a sampling rate f_s. The signal x(t) is reconstructed using the reconstruction filter H(f) whose magnitude response is shown below:

The minimum sampling rate f_S (in kHz) for perfect reconstruction of x(t) is

(13) is the correct answer.

Ques 65 GATE 2018

Let X[k]=k+1, 0≤k≤7 be 8-point DFT of a sequence x[n], where X[k]=∑_n=0^N-1x[n]e^-j2πnk/N. The value (correct to two decimal places) of ∑_n=0³x[2n] is

(3) is the correct answer.

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