December 3, 2011

EE1402 HIGH VOLTAGE ENGINEERING question papers Anna university question papers APRIL/MAY 2008 Download


B.E/B.Tech DEGREE EXAMINATION APRIL/MAY 2008
Seventh Semester
(Regulation 2004)
Electrical and Electronice Engineering
EE 1402 --HIGH VOLTAGE ENGINEERING
(Comman to B.E (Part Time) Sixth Semester Regulation 2005)
(Regulation 2004)



Time: Three hours                                                    Maximum marks: 100
Answer ALL questions
PART A (10 x 2 =20 marks)

1.What are meant by Switching Surges?Mention the approximate magnitude of Switching Surges and their frequency.

2. Why a simple spark gap cannot offer full protection against over voltages.

3.Define the following as applied to disruptive discharges:

(a) Flash over

(b) Spark over

4.What is meant by Townsend's discharge?Explain its main features

5. Mention the specification of impulse voltage as per Indian Standards.

6.What is the need for generating impulse currents.

7. Why we resort to statistical approach during breakdown due to impulse voltages

8. What are high current shunts? Mention their design criteria.

9. What are atmospheric correction factors ? Mention their significance

10.Define Insulation Co-Ordination.

PART B (5 x 16 = 80)

11 (a)  (i) Discuss the mechanism of lightning strokes and over voltages on transmession lines(8)

(ii)Cloud discharges 15 coulombs within 1.5 milliseconds on to a transmission line during lightning .DEstimate the voltage produced at the point of the stroke on the transmission line (Assume the surge impedance of the line as 350 ohms(8)
(or)
(b) (i)Mention the drawbacks of expulsion type lightning arresters(4)

(ii) Draw a cross sectional view of a non-linear resistor lightning arrester and explain its operation.(12).

12.  (a) (i) Define uniform and non-uniform field(4)

(ii) Explain why electronegative gases have high break stress(4)

(ii)Discuss Meek's theory of breakdown in gases under non-uniform fields. (8)
(or)
(b) (i) Define intrinsic strength of a solid dielectric material.Explain why intrinsic strength is not flly realized in practice.(8)

(ii) Discuss the phenomenon of thermal breakdown in solid dielectrics(8)

13 (a) (i)Discuss the merits of Cascaded transformer over a two winding transformer for producing very high ac voltages(6)

(ii) Explain with neat circuit hte generation of high DC voltages using an n-stage Cockroft-Walton circuit.Derive an expression for the total ripple content in the output voltage.(Assume necessary data)(10)
(or)
(b) (i) Starting from the basic Marx Circuit develop the circuit of a modern multistage impulse voltage generator and explain its operation(10)

(ii) A 12 stage impulse generator has 0.126 uF capacitors.The Wave Front adn Wave tail resistances are 800 ohms and 5000 ohms respectively. For a load capacitor of 1000pF , obtain the front and tail times of the impulse wave produced(6)

14.  (a)  (i)Compare the merits and demerits of measuring very high voltages using sphere gaps and potential dividers(8)

(ii)Describe the generating voltmeter method for measuring high d.c voltages(8)
(or)
(b) (i) Define 50 percent disruptive discharge voltage as applied to impulse voltages(4)

(ii) Mention the methods adopted to obtain 50% disruptive discharge voltage and discuss any one method in detail.(12)

15.  (a) (i) Explain the need for high voltage testing of electrical apparatus(4)

(ii) Mention the different types and nature of tests conducted..(4)

(iii) Discuss the arrangement with detailed procedure for conductiong wet withstand tests and state specification for water used in such tests. (12)
(or)
(b) Discuss with circuit arranements, the detailed procedure for conducting impulse voltage withstand test on a 33k41V post insulator(16)

FEEL USEFUL PLEASE GIVE +1

0 comments :

Post a Comment

Get Syllabus in your Mail

Labels

Accenture Admission Notice - 2010 Admission Notification Anna University Anna University Chennai Anna University Question Papers Anna University Trichy Apparel Technology and Management Aptitude Questions Arts and Science Colleges Biomedical Engineering C and CPP Ebooks Calicut University CBSE Question papers Civil Engineering Civil Service Exams Colleges in India Colleges Result Computer Science Engineering Core Jobs CS R2008 CSE CSIR NET EBooks Download ECE EEE EIE Electives Electrical and Electronics Engineering Electronics and communication Electronics and Instrumentation Engineering Engineering Engineering Colleges in Maharashtra Engineering Colleges in TamilNadu Engineering Admissions Engineering Colleges Engineering Colleges in Karnataka Engineering Jobs Engineering Syllabus Entrance Exam Dates Entrance Exam Results Entrance Examination Exam Time Table Experiencer First Year Syllabus Freshers Full Time Jobs Government jobs in india Hardware and Networking Jobs Hotel Management and Catering Technology IGNOU Information Technology INTEVIEW QUESTIONS IT Jobs JNTU Question Papers Jobs in Bangalore Jobs in Chennai Jobs in Coimbatore Jobs in Delhi Jobs in Hyderabad Jobs in India Jobs in Kerala Jobs in Noida Jobs in Tamilnadu Jobs in TATA Karnataka Educations Lab Manuals Mechanical Engineering Medical Colleges Placement Papers Plus 2 Preparation for exams Private Jobs in India Question Papers Question Papers Download Results Announcement Semester 1 Semester 2 Semester 3 Semester 4 Semester 5 Semester 6 Semester 7 Semester 8 Syllabus Syllabus Download Tamil Movie TCS Placement Papers Teaching Jobs TECH MAHINDRA Textile Technology Top colleges University Results UPSC VICEVESVARAYA TECHNOLOGICAL UNIVERSITY waec Walk-in Interview Web Designers

Followers

Archive

Anna university Engineering Syllabus

Earn Money From Online

Government jobs in india

Admission Notification

Total Pageviews

 

Privacy Policy
http://topengineeringcollegesintamilnadu.blogspot.com use third-party advertising companies to serve ads when you visit our website. These companies may use information (not including your name, address, email address, or telephone number) about your visits to this and other websites in order to provide advertisements about goods and services of interest to you. If you would like more information about this practice and to know your choices about not having this information used by these companies, click here.