UPSC Civil Services Mains 2018 Electrical Engineering Paper I PDF

Central Government Jobs Engineer 2018

  • Year 2018
  • Conducted By UPSC
  • Questions 8
  • Maximum Marks 250
  • Duration Three Hours
  • Languages Hindi & English

Exam Details

Detail Information
Examination Civil Services Main Examination
Year 2018
Conducting Body UPSC
Paper Electrical Engineering Paper - I
Subject Electrical Engineering
Duration Three Hours
Maximum Marks 250
Number of Questions 8
Question Type Mixed

This document contains the question paper for the Civil Services Main Examination 2018, specifically Paper I for Electrical Engineering. Conducted by UPSC, this paper is designed to assess candidates' in-depth knowledge in Electrical Engineering, with a total of 8 questions divided into two sections. Candidates are required to answer five questions in total, with questions 1 and 5 being compulsory. The paper allows three hours to complete and carries a maximum of 250 marks. This paper is crucial for aspirants aiming for engineering roles within the civil services, providing a clear understanding of the examination's scope and difficulty level.

Major Topics Covered

  • Electrical Engineering
  • Three-phase balanced circuit
  • Laplace transform
  • Thyristor gate characteristics
  • Gate drive circuit
  • Power dissipation
  • Pulsed gate current
  • Gate cathode voltage drop
  • Peak gate current

Why This Paper is Important

  • Useful for Civil Services Main Examination 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 Civil Services Main Examination 2018 Electrical Engineering Paper II
  • UPSC Civil Services Main Examination 2017 Electrical Engineering Paper I
  • UPSC Civil Services Mains 2018 Electrical Engineering Paper I Answer Key
  • UPSC Civil Services Mains Electrical Engineering Syllabus
  • Electrical Engineering Syllabus for Competitive Exams
  • UPSC Civil Services Mains Exam Pattern
  • Electrical Engineering Exam Pattern
  • UPSC Civil Services Main Examination 2019

Instructions

  • पुस्तिका के मुख-पृष्ठ पर अंकित निर्दिष्ट स्थान पर किया जाना चाहिए ।
  • प्राधिकृत माध्यम के अतिरिक्त अन्य किसी माध्यम में लिखे गए उत्तर पर कोई अंक नहीं मिलेंगे ।
  • यदि आवश्यक हो, तो उपयुक्त आँकड़ों का चयन कीजिए, तथा उनको निर्दिष्ट कीजिए ।
  • जब तक उल्लिखित न हो, संकेत तथा शब्दावली प्रचलित मानक अर्थों में प्रयुक्त हैं ।
  • प्रश्मों के उत्तरों की गणना क्रमानुसार की जाएगी ।
  • यदि काटा नहीं हो, तो प्रश्न के उत्तर की गणना की जाएगी चाहे वह उत्तर अंशतः दिया गया हो ।
  • प्रश्न-सह-उत्तर पुस्तिका में खाली छोड़ा हुआ पृष्ठ या उसके अंश को स्पष्ट रूप से काटा जाना चाहिए ।

  • There are EIGHT questions divided in TWO SECTIONS and printed both in HINDI and in ENGLISH.
  • 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.
  • Answers must be written in the medium authorized in the Admission Certificate which must be stated clearly on the cover of this Question-cum-Answer (QCA) Booklet in the space provided.
  • No marks will be given for answers written in a medium other than the authorized one.
  • Assume suitable data, if considered necessary, and indicate the same clearly.
  • 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 must be clearly struck off.

Questions (page 2)

Section A

Q1.

(a) त्रिफेज़ संतुलित परिपथ (सर्किट) में कुल औसत शक्ति के लिए व्यंजक व्युत्पन्न कीजिए ।
Derive the expression of total average power in three-phase balanced circuit.

(b) चित्र 1(b) में दिखाए गए आवर्ती फलन f(t) का लाप्लास रूपांतर ज्ञात कीजिए।
Find the Laplace transform of the periodic function f(t) shown in Figure 1(b).

(c) (i) थाइरिस्टर द्वार (गेट) अभिलक्षणों का कर्ष रूपण कीजिए एवं द्वार चालन परिपथ (गेट ड्राइव सर्किट) के अभिकल्प (डिज़ाइन) में इसका अनुप्रयोग बताइए ।
(i) Draw thyristor gate characteristics and state its application in design of gate drive circuit.

(ii) एक थाइरिस्टर का अधिकतम औसत द्वार (गेट) शक्ति क्षय सीमा 0.4 वाट है । इसे स्पंदित द्वार धारा (पल्स्ड गेट) जिसकी आवृत्ति 20 kHz है, कर्म अनुपात 0.5 है, के द्वारा खटका (ट्रिगर्ड) किया जा रहा है। यदि द्वार कैथोड वोल्टता पात 1 वोल्ट है, तो अनुज्ञेय शिखर द्वार धारा का परिमाण ज्ञात कीजिए ।
(ii) A thyristor has a maximum average gate power dissipation limit of 0.4 watts. It is triggered with pulsed gate current of frequency 20 kHz at a duty ratio of 0.5. If the gate cathode voltage drop is 1 volt, find permissible peak gate current magnitude.

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Frequently asked questions

What is the name of the exam?

The exam is the Civil Services Main Examination.

Which year is this question paper from?

This question paper is from the year 2018.

Who conducts the Civil Services Main Examination?

The examination is conducted by UPSC (Union Public Service Commission).

What is the subject of this paper?

This paper is for Electrical Engineering, specifically Paper I.

What is the maximum marks for this paper?

The maximum marks for this paper are 250.

What is the time allowed to complete this paper?

The time allowed to complete this paper is Three Hours.

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