Tripura University Mid-term exam.,sub:-transmission & distribution, college:-tit model question papers



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Posted Date: 19 Nov 2010      Posted By:: Rupesh Das    Member Level: Silver  Points: 5 (₹ 1)

2010 Tripura University Diploma Electrical Engineering (DEE) Mid-term exam.,sub:-transmission & distribution, college:-tit Question paper



Course: Diploma Electrical Engineering (DEE)   University/board: Tripura University





MID-TERM EXAMINATION-OCTOBER, 2010
TIT,NARSINGARH
SUB: TRANSMISSION & DISTRIBUTION
Full Marks-15 Time-1/2 Hrs


Answer any two questions from the following

1 (a) What are the advantages and disadvantages of d.c. transmission over a.c. transmission?[Marks 5]
(b) Discuss the advantages of high transmission voltage.[Marks 2.5]

2 (a) Name the important components of an overhead transmission line.[Marks 2]
(b) What are the various types of line supports?[Marks 2]
(c) Why steel tours are used?

3 (a) What are the various types of insulators used overhead transmission and distribution line?[Marks 1.5]
(b) What is meant by string efficiency?[Marks 1.5]
(c) A 3-phase transmission line is being support by three disc insulators. The potentials across
top unit (i.e. near to the tower) and middle unit are 8 KV and 11 KV respectively. Calculate
i) the ratio of capacitance between pin and earth to the self-capacitance of each unit
ii) the line voltage
iii) string efficiency





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