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2003 Course Switchgear & Protection

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Total No. of Questions : 12] [Total No. of Pages : 3 [3664]-188 P941 B.E. (Electrical) SWITCHGEAR & PROTECTION (2003 Course) 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. 6) Assume suitable data, if necessary. SECTION - I Q1) a) b) What do you mean by Protective Relaying? Explain the concept with basic block diagram? Why it is essential? [10] Explain the terms with reference to relay. i) Plug setting. ii) [6] Time setting. OR Q2) a) b) What do you mean by zones of protection? Explain Primary and Backup Protection. [12] List out the essential qualities of Protective Relaying. Q3) Describe in detail concept of: [4] [16] a) Resistance switching. b) Current chopping of capacitive current. OR Q4) a) Derive the expression for i) Restriking voltage. ii) [12] Maximum R.R.R.V. iii) Frequency of oscillations. State factors affecting Restriking voltage. P.T.O.

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