Electrical Engineering Gate Yearwise 

Electrical Engineering Gate 2018 Questions



Ques 1Aptitude
β€œSince you have gone off the ________, the _________ sand is likely to damage the car.”
The words that best fill the blanks in the above sentence are

a. course, coarse
b. course, course
c. coarse, course
d. coarse, coarse


a is the correct answer.




Ques 2Aptitude
"A common misconception among writers is that sentence structure mirrors thought; the more _________ the structure, the more complicated the ideas."
The word that best fills the blank in the above sentence is

a. detailed
b. simple
c. clear
d. convoluted


d is the correct answer.




Ques 3Aptitude
The three roots of the equation 𝑓(π‘₯) = 0 are π‘₯ = {βˆ’2, 0, 3}. What are the three values of π‘₯ for which 𝑓(π‘₯ βˆ’ 3) = 0?

a. βˆ’5, βˆ’3, 0
b. βˆ’2, 0, 3
c. 0, 6, 8
d. 1, 3, 6


d is the correct answer.




Ques 4Aptitude
For what values of π‘˜ given below is
(π‘˜+2)2 / π‘˜βˆ’3
an integer?

a. 4, 8, 18
b. 4, 10, 16
c. 4, 8, 28
d. 8, 26, 28


c is the correct answer.




Ques 5Aptitude
Functions 𝐹(π‘Ž, 𝑏) and 𝐺(π‘Ž, 𝑏) are defined as follows:
𝐹(π‘Ž, 𝑏) = (π‘Ž βˆ’ 𝑏)2 and 𝐺(π‘Ž, 𝑏) = |π‘Ž βˆ’ 𝑏|, where |π‘₯| represents the absolute value of π‘₯.
What would be the value of 𝐺(𝐹(1, 3), 𝐺(1, 3))?

a. 2
b. 4
c. 6
d. 36


a is the correct answer.




Ques 6Aptitude
An e-mail password must contain three characters. The password has to contain one numeral from 0 to 9, one upper case and one lower case character from the English alphabet. How many distinct passwords are possible?

a. 6,760
b. 13,520
c. 40,560
d. 1,05,456


c is the correct answer.




Ques 7Aptitude
In a certain code, AMCF is written as EQGJ and NKUF is written as ROYJ. How will DHLP be written in that code?

a. RSTN
b. TLPH
c. HLPT
d. XSVR


c is the correct answer.




Ques 8Aptitude
A class of twelve children has two more boys than girls. A group of three children are randomly picked from this class to accompany the teacher on a field trip. What is the probability that the group accompanying the teacher contains more girls than boys?

a. 0
b. 325/864
c. 525/864
d. 5/12


b is the correct answer.




Ques 9Aptitude
P, Q, R and S crossed a lake in a boat that can hold a maximum of two persons, with only one set of oars. The following additional facts are available.
(i) The boat held two persons on each of the three forward trips across the lake and one person on each of the two return trips.
(ii) P is unable to row when someone else is in the boat.
(iii) Q is unable to row with anyone else except R.
(iv) Each person rowed for at least one trip.
(v) Only one person can row during a trip.

Who rowed twice?

a. P
b. Q
c. R
d. S


c is the correct answer.




Ques 10Digital Electronics
In the logic circuit shown in the figure, Y is given by
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a. Y = ABCD
b. Y = (A + B)(C + D)
c. Y = A + B + C + D
d. Y = AB + CD


d is the correct answer.




Ques 11Electrical Machine
A single-phase 100 kVA, 1000 V / 100 V, 50 Hz transformer has a voltage drop of 5% across its series impedance at full load. Of this, 3% is due to resistance. The percentage regulation of the transformer at full load with 0.8 lagging power factor is

a. 4.8
b. 6.8
c. 8.8
d. 10.8


c is the correct answer.




Ques 12Electrical Machine
In a salient pole synchronous motor, the developed reluctance torque attains the maximum value when the load angle in electrical degrees is

a. 0
b. 45
c. 60
d. 90


b is the correct answer.




Ques 13Power Electronics
A single phase fully controlled rectifier is supplying a load with an anti-parallel diode as shown in the figure. All switches and diodes are ideal. Which one of the following is true for instantaneous load voltage and current?
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a. v0 ≥0 & i0<0
b. v0 <0 & i0<0
c. v0 ≥0 & i0≥0
d. v0<0 & i0≥0


c is the correct answer.




Ques 14Power Electronics
Four power semiconductor devices are shown in the figure along with their relevant terminals. The device(s) that can carry dc current continuously in the direction shown when gated appropriately is (are)
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a. Triac only
b. Triac and MOSFET
c. Triac and GTO
d. Thyristor and Triac


c is the correct answer.




Ques 15Power System
In the figure, the voltages are 𝑣1(𝑑) = 100cos(πœ”π‘‘), 𝑣2(𝑑) = 100cos(πœ”π‘‘ + πœ‹/18) and 𝑣3(𝑑) = 100cos(πœ”π‘‘ + πœ‹/36). The circuit is in sinusoidal steady state, and 𝑅 << πœ”πΏ. 𝑃1, 𝑃2 and 𝑃3 are the average power outputs. Which one of the following statements is true?
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a. 𝑃1 = 𝑃2 = 𝑃3 = 0
b. 𝑃1 < 0, 𝑃2 > 0, 𝑃3 > 0
c. 𝑃1 < 0, 𝑃2 > 0, 𝑃3 < 0
d. 𝑃1 > 0, 𝑃2 < 0, 𝑃3 > 0


c is the correct answer.