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2003 Course Switchgear & Protection

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Total No. of Questions : 12] [Total No. of Pages : 4 P1341 [3764]-211 B.E. (Electrical) SWITCHGEAR & PROTECTION (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates : 1) Answer 3 questions from Section I and 3 questions from Section II. 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. 6) Assume suitable data, if necessary. SECTION - I Q1) a) Give the classification of relays and explain in brief the basis for it. [8] b) Derive the torque equation for induction type relay. [8] OR Q2) a) What are the different types of faults occurring on power transmission circuit and state their percentage occurrence with representation. [8] b) What are basic requirements of protective relaying. Q3) a) Explain the phenomenon of Current Chopping . b) What are the factors affecting the restriking voltage. [8] [6] [4] P.T.O.

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