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

Electrical Engineering : Power Systems QUESTIONS AND ANSWERS :: part2 : 11 to 15

Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2021 and IES 2021 examinations :

 11.For a 500 Hz frequency excitation, a 50 km, long power line will be modelled as short line medium line long line data insufficiency for decision ANSWER : : long line Explanation :
 12.The charging current per kill of the line is 0.497 Amp 0.61 Amp 0.68 Amp 0.21 Amp ANSWER : : 0.497 Amp Explanation :
 13.What is the time of operation of a relay of rating 5 amp 2.2 sec, IDMT and having a relay of setting of 125% Tms = 0.6 It is connected to a supply circuit through a CT, 400 ratio. The fault current is 400 amp. 10.Osec 1.92sec 4.5 sec 2.4 sec ANSWER : : 1.92sec Explanation :
 14.A three phase over head transmission line has its conductors horirzontally spaced with spacing between adjacent conductors equal to 'd'. if now the conductors of the line are rearranged to form and equilateral triangle of sides equal to 'd' then average capacitance and inductance will increase average capacitance will decrease and inductance will increase average capacitance will increase and inductance will decrease surge impedance loading of the line Increases ANSWER : : average capacitance and inductance will increase Explanation :
 15.A two conductor 1 - pi line operates at 50 Hz. The diameter of each conductor is 20 mm and the spacing between conductors is 3m. What is the inductance of each conductor per km? 1.19 kH/km 1.24 mH/km 2.38 mH/km 0.59 mH/km ANSWER : : 1.19 kH/km Explanation :

More Power Systems QUESTIONS AND ANSWERS available in next pages

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