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

12.The charging current per kill of the line is

0.497 Amp
0.61 Amp
0.68 Amp
0.21 Amp

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.

4.5 sec
2.4 sec

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

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

More Power Systems QUESTIONS AND ANSWERS available in next pages

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