JPSC Assistant Engineer 2021: Assistant Engineer Written Exam, Advt. No. 08/2018 and 08/2019, ELECTRICAL ENGINEERING PAPER-I SUBJECT-CODE-12
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Total No. of Printed Pages - 4
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HLECTRICAL ENGINEERING
PAPER - I
SUBJHCT CODE : 12
Full Marks : 200 Time : 3 Hours
Ii.structious For Cc[ndidates ..
Please read each Of the fiollowing instructions carefully bofore attempting questions.
(1) Arls:wers must be written in ENGLISH only.
(2) The question paper contairis a total Of 8 questions in TWO Sections : Section-A
and Section-B. qouR questions in each section)
(3) Question No.1 Of section `A' and Qf testion No. 5 Of section `B' are compulsory_.
(4) Candidates have to attempt another THREE qu_estiou from remaining SET
question choosing atleast ONE question from each section.
(5) Assume suitable data if f ound necessary.
(6) Wherever any assumption be made fior arlswering a question, they must be
clearly indicated.
q) Marks carried by a question / section is indicated against it.
(8) Unless struck of i attempt of question shall be counted even if attempted partly.
(9) Any page or portion of the page lef i blank in the Answer Booklet must be clearly
struck off
SECTION-A
Marks
(A) Find the response of source free series RLC circuit for following cases referring
to circuit below, which has a DC source. Series RLC circuit shown is being
excited by the energy initially stored in the capacitor and inductor. The energy is
represented by the initial capacitor voltage (Vo) and initial inductor current ao).
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AEUD (12) Paper-I
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Marks
(i) Find out the governing relations for the response and express the roots
using characteristic equation.
(ii) Write the form of solution in case Qfunderdamped response.
a) What is Gausses law in relation to electric field ? Explain. Also write its
mathematical fom.
(C) What are the different classes in magnedc behavior of materials?
a)) What is a flowchart ? Point out 3 advantages of using a flowchart in
programming ?
q3) What is wheatstone bridge? Explain its principle, with suitable diagram. 8
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Determine average power generated by each source and average power absorbed
by each element.
a3) Explain six symbols used in flowchart with their meaning.
3. (A) Describe with suitable energy band diagrams, three major classifica,tion of
15
materials.
q3) How is piezoelectricity generated ? Explain. Give three examples for such
materials.
(C) What are the froctious ofdielectric used in capacitors?
Paper-I
AEUD (12)
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Marks
4. (A) What is the advantage of using Kelvin bridge over Wheatstone's bridge ?
Explain its principle of operation with neat diagrams. 20
a3) What is an algorithm ? Define the steps to construct an algorithm, using a
suitable example. 10
(C) What is telemetry ? What is a telemeter, and which technologies are used in such
devices ? 10
SECTION-a
5. (A) Find thez-parameters ofthenetworkbelow :
20Q 30Q
G) Explain ferro and ferri magnetism, with suitable diagrans, and give two
examples for such materials.
(C) What is displacement current? Express mathematically.
a) Write down algorithm & draw frowchart to find sum of series 1+3+5+...+N,
where N is positive odd integer.
q3) What are electric transducers? Explain active and passive transducers with one
example each.
6. (A) Write down the expression for source -free Maxwell's equations and explain its
significance. 15
a3) Define superconductivity. What is the cause of this phenomenon ? Give two
examples of such materials.
(C) Explain Hall effect, and what infomation does it provide?
AEUD (12) Paper-I
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Marks
(A) In the circuit, find the resonant frequency and the half-power frequencies. 20
R=2Q L=lmH
C - 0-4 pF
20 sin®t V
q3) Draw the block diagram for digital multi-meter using successive approximation
ADC. Briefly explain its operation, using a simple exanple.
(A) Explain how gradient derives a vector field from scalar field with simple
examples (for 3D and 2D). Express the general fom for 3-D gradient. 15
a3) Explain structured programming. Write down three advantages and
disadvantages.
(C) Write down five properties ofHurwitz's polynomial.
AEUD (12) Paper-IOfficial key not published for this paper.
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Source: Jharkhand Public Service Commission. Question paper published by Jharkhand Public Service Commission.