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

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


ans any 2 ques. from the subsequent

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

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

3 (a) elaborate the different kinds 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 3 disc insulators. The potentials across
top unit (i.e. near to the tower) and middle unit are eight KV and 11 KV respectively. compute
i) the ratio of capacitance ranging from pin and earth to the self-capacitance of every unit
ii) the line voltage
iii) string efficiency

Earning:   Approval pending.