GATE 2021 Electronics and Communication (ECE) Answer Key (Out) – Get Here

GATE 2021 Electronics and Communication (ECE) Answer Key – GATE ECE answer key 2021 is available here. The candidates can check GATE 2021 ECE answer key to calculate the rough score in the exam before the result. The GATE answer key has correct answers to all questions asked in the exam. Check GATE 2021 Electronics and Communication (ECE) Answer Key here.

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GATE 2021 Electronics and Communication (ECE) Answer Key

  • Exam Date – 07 February 2021
  • Timings – 3.00 PM – 6.00 PM
  • Subject Paper – Electronics and Communication (EC)
  • GATE 2021 Result Date: 22 March 2021

If you appeared for GATE 2021 ECE paper, then submit your questions and we will provide you the answer key. Click on the button below to submit answers. All the best!

Q1. A 2*2 non-singular matrix with repeated eigenvalue is given as
A = [x -3 .0]
30 4.0
where x is a real positive number. The value of x is ________

Q2. – (1235)x = (3033)y. Find the base x and y

Q3. y = 2x+3 where x and y are random variables. What should be the variance relation?
Ans. 4σx2

Q4. Ideal operational amplifier, Vref is fixed.
Vout = 1V for Vin = 0.1V
Vout = 6V for Vin = 1V1
where Vout is measured across Rt connected at the output of the operational amplifier. The value of  RF / Rin = ?
Ans. 5.555

Q5. An asymmetric periodic pulse train Vin of 10V amplitude with on Ton = 1ms and off time Toff = 1μs in applied. The Di ideal is ideal.

Q6. m(+) 4√2 sin2π x 103t
Kp = 2 Rad / sec
c(+) = 2 cos (2π x 106t)

Q7. A unity feedback system that uses (PI) control is shown in the figure. The stability of the overall system to controlled by tunning the PI control parameters kP and KI the maximum value of KL that can be chosen so as to keep the overall system stable or, in the worst case, marginally stable is _______

Q8. If G(s) H(s) has one zero in the right-half of the s-plane, the number of poles that the closed loop system will have in the right half of the s-plane is

Q9. If the vectors (1, -1, 2), (7, 3, x), (2, 3, 1) in R3 are lineraly independent. The value of x is _______

q10. Consider the differential equation dy / dx + x / (1–x2) y = x√y
I.F of differential equation is


Ques. Find the current flowing through the PQ branch as shown in the figure below.

Ans. 0.5 A

Ques. The admittance parameters are

Ans. Y11 = 2, Y12 = -4, Y21 = -1, Y22 = 2


Ans. 1 volt


You can also check: GATE answer keys for all 27 papers | GATE 2021 ECE paper analysis

GATE 2021 Electronics and Communication (ECE) Answer Key Dates

Memory-based answer key is released by the subject experts few hours after the exam is over. These answer keys are prepared according to the student’s inputs about the exam. Check the important dates regarding GATE 2021 answer key given below.

GATE 2021 Answer KeyDates
Exam Date06, 07, 13 and 14 Feb 2021
Availability of official answer keyto be announced

How to Calculate Score Using GATE 2021 Answer Key?

To have an estimate about GATE 2021 score using the answer key, the candidates can follow the steps given below.

1st step: Click on the link of the answer key given above on this page.

2nd step: Then, download the answer key. Also download the response sheet and question papers.

3rd step: Next, cross-check the answers as mentioned in the question paper.

4th step: Write down the number of correct and incorrect answers and use the marking scheme given below to calculate the scores.

Type of questionsMarks for correct questionNegative marking
MCQ+1 or +2 -1/3 for 01 mark MCQ
-2/3 for 02 mark MCQ
MSQ+1 or +2No negative marking
NAT+1 or +2No negative marking

The score obtained after following the above-given marking scheme will be the estimate score of GATE 2021.

GATE Electronics and Communication Engineering Cut-Off

Every year along with the declaration of the result, GATE cut-off is also announced according to various subjects. The cut-off refers to the minimum marks that candidates must have obtained in GATE 2021 in order to take admission in their desired college.

Check the previous year’s GATE Electronics and Communication Engineering cut-off given below.

Electronics and Communication Engineering – EC28.825.919.2

GATE 2021 Question Paper

GATE question paper is released along with the answer key. This time, IIT Bombay will release GATE 2021 question paper online at

The question paper is released in PDF format. The candidates can use the question paper along with the answer key to have better idea about the scores.

GATE 2021 Official Electronics and Communication Engineering Paper Answer Key

The candidates can download the official GATE 2021 official answer key from IIT Bombay will release the official answer key subject-wise after the exam for all the dates are over.

Unlike the unofficial answer key, the candidates can challenge the official answer key if they are not satisfied with any answers indicated in it.

How to Download GATE 2021 Official ECE Answer Key?

The candidates can download GATE 2021 official answer key only from the official website of IIT Bombay. Check the steps given below to download the answer key.

1st step: Go to the official website,

2nd step: Next, click on the link of the answer key available on the homepage.

3rd step: Then, look for the respective subject-paper and download it. Also, download the question paper.

4th step: At last, start cross-checking the answers.

GATE 2021 Result

The candidates can check GATE 2021 result from GOAPS website, To check the result, enrolment id / email address and password.

  • No hardcopy of the scorecard shall be sent to the qualified candidates.
  • GATE 2021 score is valid for 3 years from the date of the declaration of the result.
  • For papers where there is only one session, actual marks secured by the candidates will be used for calculating the scores. On the other hand, for papers of multi-session, raw marks will be normalized. The normalized marks will be used to determine GATE 2021 score.

About GATE 2021

Graduate Aptitude Test in Engineering (GATE) is a national level entrance examination held for admission into PG Programs like M.Tech / M.E / Ph.D. It is a computer-based test. It is held for 27 subject-papers. Qualifying GATE is mandatory for admission into PG programmes. GATE score is also used by various PSUs for their recruitment.

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