Engineering Service 2021 ECE Paper I (Main) - Page 1-2
- Year 2021
- Conducted By U-ELX-YUGT
- Questions 8
- Maximum Marks 300
- Duration Three Hours
- Languages English
Exam Details
| Detail | Information |
|---|---|
| Examination | Engineering Service |
| Year | 2021 |
| Conducting Body | U-ELX-YUGT |
| Paper | Electronics and Telecommunication Engineering Paper - I |
| Subject | Electronics and Telecommunication Engineering |
| Duration | Three Hours |
| Maximum Marks | 300 |
| Number of Questions | 8 |
| Question Type | Descriptive / Subjective |
This document covers the Engineering Service Main Examination 2021 for Electronics and Telecommunication Engineering, Paper I. The first page outlines the exam metadata, timing (Three Hours) and maximum marks (300). Instructions indicate eight questions in two sections with five to be attempted, with Q1 and Q5 compulsory and English as the language of answers. Page 2 presents Section A: Q1 with three sub-parts. Q1(a) asks for an order-of-magnitude estimate of the electric field due to a 1% increase in electron density in a 0.03 cm region of an N-type silicon bar. Q1(b) requires calculation of Schottky barrier heights for Pt-Si and the built-in voltage for Pt/N-type Si. Q1(c) requests the mesh current matrix equation for a given resistor network and solving for currents. The content integrates semiconductor physics and circuit analysis relevant to ESE Electronics and Telecommunication Engineering.
Major Topics Covered
- Engineering Service
- Electronics and Telecommunication Engineering
- Paper I
- Main Examination
- N-type silicon
- Semiconductor physics
- Built-in voltage
- Work function
- Electron affinity
- Schottky barrier
- Metal-semiconductor contact
- Mesh current method
- Circuit analysis
- Conduction band
- Density of states
- Mobility
- Electric field
- Parameter constants
- Electrical engineering exams
- Central government job papers
Why This Paper is Important
- Useful for Engineering Service 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
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- UPSC Engineering Service 2021 Electronics & Telecommunication Paper II PDF
- UPSC Engineering Service Civil Engineering Paper I 2021 Question Paper PDF
Instructions
- There are EIGHT questions divided in TWO sections.
- Candidate has to attempt FIVE questions in all.
- Questions No. 1 and 5 are compulsory and out of the remaining, THREE are to be attempted choosing at least ONE question from each section.
- The number of marks carried by a question / part is indicated against it.
- Wherever any assumptions are made for answering a question, they must be clearly indicated.
- Diagrams/figures, wherever required, shall be drawn in the space provided for answering the question itself.
- Unless otherwise mentioned, symbols and notations carry their usual standard meanings.
- Attempts of questions shall be counted in sequential order.
- Unless struck off, attempt of a question shall be counted even if attempted partly.
- Any page or portion of the page left blank in the Question-cum-Answer Booklet (QCA) must be clearly struck off.
- Answers must be written in ENGLISH only.
- Values of constants which may be required : = -1.6 \times 10-19 Coulomb Electron charge = 4\pi \times 10^{-7} Henry/m Free space permeability = (1/36\pi) \times 10^{-9} Farad/m Free space permittivity 3\times10^8 m/sec Velocity of light in free space = 1.38\times10^{-23}\,\mathrm{J/K} Boltzmann constant = = 6.626 \times 10^{-34} J-s Planck's constant U-ELX-YUGT 1
Questions (page 2)
Q0. The work function φ_m of platinum is 5 eV and the electron affinity for silicon is χ_Si = 4.05 eV. Determine the barrier height φ_Bn (barrier height for transfer of electron from metal to semiconductor) and φ_BP (barrier height for transfer) of holes from metal to semiconductor). Also calculate the built-in voltage Vbi for metal-semiconductor contact of platinum with N-type silicon having doping concentration N_D = 2.8 × 10^{14}/cm^3. Assume that effective density of states in the conduction band edge is N_C = 2.8 × 10^{19}/cm^3, KT = 0.025 eV at room temperature, E_G = 1.1 eV.
Q0. Write the mesh current matrix equation for the network of figures shown by inspection, and solve for the currents.
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Frequently asked questions
What is the exam name and year?
Engineering Service Main Examination, 2021.
Which subject and paper does this document correspond to?
Electronics and Telecommunication Engineering, Paper I.
How many questions are there and how many must be attempted?
There are eight questions in two sections; five questions must be attempted in total. Questions No. 1 and 5 are compulsory; at least one question must be attempted from each section.
What is the maximum marks and duration?
Maximum marks are 300; time allowed is three hours.
In which language should answers be written?
Answers must be written in English only.
What constants are provided for the physics problems?
Constants include electron charge, free space permeability, free space permittivity, velocity of light, Boltzmann constant, and Planck's constant as given in the question.