What are the questions asked in GATE 2018 Electrical Engineering exam?

Complete set of questions from GATE 2018 EE exam covering Power Systems, Electrical Machines, Control Systems, Power Electronics, Analog and Digital Electronics, Signals and Systems, Electromagnetic Theory, Network Theory, Measurements, and more with detailed solutions.

Where can I download GATE 2018 Electrical Engineering question paper?

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

How many questions were in GATE 2018 EE paper?

GATE 2018 Electrical Engineering paper consisted of 65 questions including MCQs, MSQs, and numerical answer type questions covering all major electrical engineering topics.

Are solutions provided for GATE 2018 EE questions?

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

What topics are covered in GATE 2018 Electrical Engineering paper?

GATE 2018 EE covers Power Systems, Electrical Machines, Control Systems, Power Electronics, Analog Electronics, Digital Electronics, Signals and Systems, Electromagnetic Theory, Network Theory, Measurements and Instrumentation, and Engineering Mathematics.

Electrical Engineering Gate 2018 Questions with Answer

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Ques 53 GATE 2018

A dc to dc converter shown in the figure is charging a battery bank, B2 whose voltage is constant at 150 V. B1 is another battery bank whose voltage is constant at 50 V. The value of the inductor, L is 5 mH and the ideal switch, S is operated with a switching frequency of 5 kHz with a duty ratio of 0.4. [cite: 112, 113] Once the circuit has attained steady state and assuming the diode D to be ideal, the power transferred from B1 to B2 (in Watt) is ___________ (up to 2 decimal places).

(12.00) is the correct answer.

Ques 54 Gate 2018

In the figure, the voltages are 𝑣₁(𝑡) = 100cos(𝜔𝑡), 𝑣₂(𝑡) = 100cos(𝜔𝑡 + 𝜋/18) and 𝑣₃(𝑡) = 100cos(𝜔𝑡 + 𝜋/36). The circuit is in sinusoidal steady state, and 𝑅 << 𝜔𝐿. 𝑃₁, 𝑃₂ and 𝑃₃ are the average power outputs. Which one of the following statements is true?

𝑃1 = 𝑃2 = 𝑃3 = 0

𝑃1 < 0, 𝑃2 > 0, 𝑃3 > 0

𝑃1 < 0, 𝑃2 > 0, 𝑃3 < 0

𝑃1 > 0, 𝑃2 < 0, 𝑃3 > 0

Ques 55 GATE 2018

Consider a lossy transmission line with V₁ and V₂ as the sending and receiving end voltages, respectively. Z and X are the series impedance and reactance of the line, respectively. The steady-state stability limit for the transmission line will be

greater than |^V₁V₂⁄_X|

less than |^V₁V₂⁄_X|

equal to |^V₁V₂⁄_X|

(b) is the correct answer.

Ques 56 GATE 2018

The series impedance matrix of a short three-phase transmission line in phase coordinates is If the positive sequence impedance is (1+j10) Ω, and the zero sequence is (4+j31) Ω, then the imaginary part of Z_m(in Ω) is ________ (up to 2 decimal places).

(7.00) is the correct answer.

Ques 57 GATE 2018

The positive, negative and zero sequence impedances of a 125 MVA, three-phase, 15.5 kV, star-grounded, 50 Hz generator are j0.1 pu, j0.05 pu and j0.01 pu respectively on the machine rating base. The machine is unloaded and working at the rated terminal voltage. If the grounding impedance of the generator is j0.01 pu, then the magnitude of fault current for a b-phase to ground fault (in kA) is ________ (up to 2 decimal places).

(73.33) is the correct answer.

Ques 58 GATE 2018

A 1000×1000 bus admittance matrix for an electric power system has 8000 non-zero elements. The minimum number of branches (transmission lines and transformers) in this system are ________ (up to 2 decimal places).

(3500) is the correct answer.

Ques 59 GATE 2018

The positive, negative and zero sequence impedances of a three phase generator are Z₁, Z₂, and Z₀ respectively. For a line-to-line fault with fault impedance Z_f, the fault current is I_f1 = kI_f, where I_f is the fault current with zero fault impedance. The relation between Z_f and k is

Z_f = ^{(Z₁ + Z₂)(1 - k)} / k

Z_f = ^{(Z₁ + Z₂)(1 + k)} / k

Z_f = ^{(Z₁ + Z₂)k} / ^{1 - k}

Z_f = ^{(Z₁ + Z₂)k} / ^{1 + k}

(a) is the correct answer.

Ques 60 GATE 2018

Consider the two bus power system network with given loads as shown in the figure. All the values shown in the figure are in per unit. The reactive power supplied by generator _G1 and _G2 are Q_G1 and Q_G2 respectively. The per unit values of Q_G1, Q_G2 and line reactive power loss Q_loss respectively are:

5. 00, 12.68, 2.68

6.34, 10.00, 1.34

6.34, 11.34, 2.68

5.00, 11.34, 1.34

Ques 61 GATE 2018

The per-unit power output of a salient-pole generator which is connected to an infinite bus, is given by the expression: P = 1.4 sin(δ) + 0.15 sin(2δ), where δ is the load angle. Newton-Raphson method is used to calculate the value of δ for P = 0.8 pu. If the initial guess is 30°, then its value (in degree) at the end of the first iteration is:

15°

28.48°

28.74°

31.20°

Ques 62 GATE 2018

A continuous-time input signal x(t) is an eigenfunction of an LTI system, if the output is

kx(t), where k is an eigenvalue

ke^{jω t}x(t), where k is an eigenvalue and e^{jω t} is a complex exponential signal

x(t)e^{jω t} where e^{jω t} is a complex exponential signal

kH(_ω), where k is an eigenvalue and H(_ω) is the frequency response of the system

(a) is the correct answer.

Ques 63 GATE 2018

Consider the two continuous-time signals defined below:

These signals are sampled with a sampling period of T = 0.25 seconds to obtain discrete-time signals x₁[n] and x₂[n], respectively. Which one of the following statements is true?

The energy of x₁[n] is greater than the energy of x₂[n].

The energy of x₂[n] is greater than the energy of x₁[n].

x₁[n] and x₂[n] have equal energies.

Neither x₁[n] nor x₂[n] is a finite-energy signal.

(a) is the correct answer.

Ques 64 GATE 2018

The signal energy of the continuous-time signal x(t)=[(t−1)u(t−1)]−[(t−2)u(t−2)]−[(t−3)u(t−3)]+[(t−4)u(t−4)] is

11/3

7/3

1/3

5/3

(d) is the correct answer.

Ques 65 GATE 2018

The Fourier transform of a continuous-time signal x(t) is given by: X(ω) = ½(1 + jω), -∞ < ω < ∞, where j = √-1 and ω denotes frequency. Then the value of | ln(xt) | at t =1 is ___________ (up to 1 decimal place). (ln denotes the logarithm to base e)

(10.0) is the correct answer.

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