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2003 Course High Voltage Eng. (Elective II)

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Total No. of Questions : 12] P1344 [Total No. of Pages : 3 [3764]-214 B.E. (Electrical) HIGH VOLTAGE ENGINEERING (403150) (2003 Course) (Elective - II) Time : 3 Hours] [Max. Marks :100 Instructions to the candidates : 1) Answer any THREE questions from each section. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. SECTION - I Q1) a) Explain the term Ionisation . With reference to breakdown in gases, discuss the following ionization processes. [9] i) Ionisation by Collision. ii) Photo - ionisation and iii) Secondary ionisation. b) Define Townsend s first and second ionisation coefficients. How is the condition for breakdown obtained in a Townsend discharge? [7] OR Q2) a) What is Paschen s law? How do you account for the minimum voltage for breakdown under a given p d condition? [8] b) What will the breakdown strength of air be for small gaps (0.2 cm) and large gaps (10 cm) under uniform field conditions and standard atmospheric conditions? [8] Q3) a) With reference to conduction and breakdown in commercial liquids explain: [9] i) Suspended Particle Mechanism. ii) Cavitation and Bubble Mechanism. iii) Stressed oil volume Mechanism. P.T.O.

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