4364-114-HighVoltage-2003
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(1 ) [Total No. of Questions: 1 2 ] [T o ta l No. of Print ed Pages: 3 ] UNI VERSIT Y OF PUN E [4364]-114 B. E. ( E l e c t r i c al ) Examination - 2013 H i g h V o l ta g e E n g inee r i n g ( 2 0 0 3 C our s e ) [Time: 3 Hours] [Max. Marks: 100] I ns tr uc ti ons : 1 Answer an y o ne question from each Unit. 2 Answer 3 questions from Section-I and 3 questions from Section-II 3 A n s w e r s to t he two se cti ons s houl d be w r i t t e n in s e parate ans we r -books . 4 Ne a t dia g ram s m u s t be d r a w n w he r e v e r n e ce s s ar y. 5 B l ac k f i g ures t o t h e ri g h t in d icate f u ll ma r k s . 6 Use of logarithmic tables and electronic pocket calculator is allowed. 7 As s ume s u it a b l e d a t a , i f n e c e s s a ry. SECTION – I Unit-I Q.1 A Explain the t erm ionizat ion. W ith reference to break down in gases explain the following ionization processes. i . Impact ionization i i . Photo ionization iii. Ionization by metastables. 08 B D erive current grow th equation in presence of p rimary and secondary ionization p rocess i n u n i f orm f i e l d . De f i n e To w n se n d ’s f i rst a n d sec o n d i o n i zat i o n coefficients. 08 O R Q.2 A Compare Townsend’s theory and streamer theory of b rea k d o w n i n g a seo u s dielectrics. 08 B What is Paschen’s law? Give its limitations and explain the Paschen’s curve. 08 Unit-II Q. 3 A Explain the following a. Breakdown in solid dielectrics due to cavity 10
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