# Electrical Engineering Questions And Answers :: Power Systems: part2

Electrical Engineering : Power Systems QUESTIONS AND ANSWERS :: part2 : 21 to 25

Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :

 21.For an existing ac transmision line, the string efficiency is 80%, if dc voltage is supplied for the same set up, the string efficiency will be < 80% 80% 90% 100% ANSWER : : 80% Explanation :
 22."Expanded ACSR" are conductors composed of larger diameter individual strands for a given cross-section of the aluminium strangs larger diameter of a central steel strands for a given overall diameter of the conductor larger diamter of the aluminium strands only for a given overall diameter of the conductor a fillter between the inner steel and the outer aluminium strands to increase the overall diameter of the conductor ANSWER : : a fillter between the inner steel and the outer aluminium strands to increase the overall diameter of the conductor Explanation :
 23.A conductor is composed of seven identical copper .Iranu, each having a radius r. The self GMD of the conductors will be 2.177 r 2.645 r 2.141 r 1.21 r ANSWER : : 2.177 r Explanation :
 24.What is the sag for a span of 400m, if the ultimate tensile strength of conductor is 6000 kgf, and the weight of conductor is 550 kgf/km? Factor of safety is 2. 1.016 m 2.40 m 3.6 m 4.2 m ANSWER : : 3.6 m Explanation :

More Power Systems QUESTIONS AND ANSWERS available in next pages

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