What type of questions are included in this paper?

This paper includes objective-type multiple-choice questions.

How many items (questions) are there in the test booklet?

The test booklet contains 150 items (questions).

Is there a penalty for wrong answers?

Yes, there is a penalty for wrong answers. One-third (0.33) of the marks assigned to the question will be deducted for each wrong answer.

What happens if a candidate gives more than one answer to a question?

If a candidate gives more than one answer, it will be treated as a wrong answer, and there will be a penalty.

Is there any penalty for leaving a question blank?

No, there is no penalty for leaving a question blank.

UPSC ESE 2020 Electronics & Telecommunication Engineering Question Paper PDF

Name: UPSC ESE 2020 Electronics & Telecommunication Engineering Question Paper PDF
Creator: UPSC

Central Government Jobs Engineer 2020

Year 2020
Conducted By UPSC
Questions 150
Maximum Marks 300
Duration Three Hours
Languages English

Exam Details

Detail	Information
Examination	Engineering Service (Preliminary) Examination
Year	2020
Conducting Body	UPSC
Paper	Electronics & Telecommunication Engineering
Subject	Electronics & Telecommunication Engineering
Duration	Three Hours
Maximum Marks	300
Number of Questions	150
Question Type	Objective (MCQ)

This is the official question paper for the Electronics & Telecommunication Engineering paper of the UPSC Engineering Service (Preliminary) Examination 2020. The exam, conducted by the Union Public Service Commission (UPSC), tests candidates' knowledge in the E&T discipline. This paper consists of objective-type multiple-choice questions and is designed to assess the foundational understanding and application of engineering principles. With a duration of three hours and a maximum of 300 marks, it serves as a crucial resource for aspirants preparing for the ESE exam, offering insights into the exam pattern, difficulty level, and important topics.

Major Topics Covered

Electronics & Telecommunication Engineering
AC Source
Capacitor
Resistor
Frequency
Silicon Dioxide
Diffusion
MOSFET
Unity-Gain Bandwidth
Class-B Push-Pull Amplifier
Class-A Push-Pull Amplifier
Harmonic Distortion
Multistage Amplifier
Decibel (dB) Voltage Gain

Why This Paper is Important

Useful for Engineering Service (P) Exam preparation
Helps understand the latest exam pattern
Useful for practice and self-assessment
Covers frequently asked General Studies topics
Helpful for analysing question trends

Related Resources

UPSC ESE 2021 Electronics & Telecommunication Engineering Question Paper
UPSC ESE 2019 Electronics & Telecommunication Engineering Question Paper
UPSC ESE 2020 Electrical Engineering Question Paper
UPSC ESE 2020 Mechanical Engineering Question Paper
UPSC ESE 2020 Electronics & Telecommunication Engineering Answer Key
UPSC ESE Electronics & Telecommunication Engineering Syllabus
ESE Prelims Syllabus
UPSC ESE Exam Pattern

Instructions

IMMEDIATELY AFTER THE COMMENCEMENT OF THE EXAMINATION, YOU SHOULD CHECK THAT THIS TEST BOOKLET DOES NOT HAVE ANY UNPRINTED OR TORN OR MISSING PAGES OR ITEMS, ETC.
IF SO, GET IT REPLACED BY A COMPLETE TEST BOOKLET.
PLEASE NOTE THAT IT IS THE CANDIDATE'S RESPONSIBILITY TO ENCODE AND
FILL IN THE ROLL NUMBER AND TEST BOOKLET SERIES CODE A, B, C OR D CARE- FULLY AND WITHOUT ANY OMISSION OR DISCREPANCY AT THE APPROPRIATE PLACES IN THE OMR ANSWER SHEET.
ANY OMISSION/DISCREPANCY WILL RENDER THE ANSWER SHEET LIABLE FOR REJECTION.
You have to enter your Roll Number on the Test Booklet in the Box provided alongside.
DO NOT write anything else on the Test Booklet.
This Test Booklet contains 150 items (questions).
Each item comprises four responses (answers).
will select the response which you want to mark on the Answer Sheet.
In case, you feel that there is more than one correct response, mark the response which you consider the best.
In any case, choose ONLY ONE response for each item.
You have to mark your responses ONLY on the separate Answer Sheet provided.
the Answer Sheet. All items carry equal marks.
Before you proceed to mark in the Answer Sheet the response to various items in the Test Booklet,
you have to fill in some particulars in the Answer Sheet as per instructions sent to you with your Admission Certificate.
After you have completed filling in all your responses on the Answer Sheet and the examination has
concluded, you should hand over to the Invigilator only the Answer Sheet.
You are permitted to take away with you the Test Booklet.
Sheets for rough work are appended in the Test Booklet at the end.
THERE WILL BE PENALTY FOR WRONG ANSWERS MARKED BY A CANDIDATE.

Questions (page 2)

Q1. A single-phase full wave rectifier uses semiconductor diodes. The transformer voltage is 35 V rms to center tap. The load consists of a 40 \muF capacitor in parallel with a 250 \Omega resistor. The diode and transformer resistances and leakage reactance are neglected. If the power line frequency is 50 Hz, the dc current in the circuit will be

(a) 132 mA
(b) 144 mA
(c) 156 mA
(d) 168 mA

Q2. Silicon dioxide (SiO_{2}) is used in ICs, because it

(a) Facilitates the penetration of diffusants
(b) Has high heat conduction
(c) Prevents diffusion of impurities
(d) Controls the concentration of diffusants

Q3. Consider an n-channel MOSFET with parameters : K_n = 0.25\,mA/V², V_TN = 1\,V, λ = 0, C_gd = 0.04\,pF and C_gs = 0.2\,pF. If the transistor is biased at V_GS = 3\,V, the unity-gain bandwidth of an FET will be

(a) 626 MHz
(b) 646 MHz
(c) 663 MHz
(d) 683 MHz

Q4. The voltage gain of CE amplifier circuit can be approximated for an ideal input ac source and is given by

(a) A_{v_s} = (r'_e)/((R_C × R_L))
(b) A_{v_s} = -((R_C || R_L))/(r'_e)
(c) A_{v_s} = -((R_C || R_L))/(r'_e)
(d) A_{v_s} = ((R_C × R_L))/(r'_e)

Q5. The advantage of using a Class-B push-pull transistor amplifier over a Class-A push-pull transistor amplifier is

(a) A negligible power loss at no input signal
(b) Harmonic distortion is lower
(c) Self-bias can be used
(d) Supply voltages have good regulation

Q6. The overall decibel (dB) voltage gain of a multistage amplifier is

(a) The dB voltage gain of the first stage
(b) The product of the dB voltage gains of the individual stages
(c) The sum of the dB voltage gains of the individual stages
(d) The dB voltage gain of the last stage

Question paper preview

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UPSC ESE 2020 Electronics & Telecommunication Engineering Prelims question paper page 1 instructions scan PDF download — Page 1

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Frequently asked questions

What is the full name of the exam?

The full name of the exam is the Engineering Service (Preliminary) Examination.

Which year is this question paper from?

This question paper is from the year 2020.

Who conducts the Engineering Service Examination?

The Engineering Service Examination is conducted by the Union Public Service Commission (UPSC).

What is the subject of this paper?

The subject of this paper is Electronics & Telecommunication Engineering.

What is the duration of the examination?

The time allowed for the examination is Three Hours.

What are the maximum marks for this paper?

The maximum marks for this paper are 300.

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