Electrical Engineering Questions And Answers :: Power Systems: part2

Electrical Engineering : Power Systems QUESTIONS AND ANSWERS :: part2 : 1 to 5

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

1.In a string of suspension insulators, the voltage distribution across the different units of a string could be made uniform by the use of a grading ring, because it

forms capacitances with link-pins to carry the charging current from link pins
forms capacitances which help to cancel the charging current from link pins
increases the capacitances of lower insulator units of cause equal voltage drop
decreases the capacitances of upper insulators units to cause equal voltage drop

2.A transmission line conductor having a diameter of 19.5 mm, weight 850 kglkm. The span is 275 m. The wind pressure is 39 kg/m of projected area with ice coating of 13 mm. The ultimate strength of the conductor is'8000 kg. What is the maximum sag, if the factor of safety is 2 and ice weight 910 kg/m3?

4.5 m
6.4 m
7.0 m
5 m

3.An overhead transmission line has a span of 240m between level supports. What is the maximum sag if the conductor weight 727 kg/km and has a breaking strength of 6880 kg? Allow the factor of safety of 2. Neglecting wind and ice loading.

1.52 m
1.6 m
0.75 m
1.25 m

4.A two conductor 1 - pi line operates at 50 Hz. The diameter of each conductor is 4 cm and are spaced 6 m apart. What is the capacitive susceptance to neutral per km?

1.42 x 10-9 s/km
3.25 x 10-8 s/km
4.8 x 10-9 s/krn
3.06 x 10-9 s/km

5.A two conductor 1 - pi line operates at 50 Hz. The diameter of each conductor is 20mm and the spacing between conductor is 3m. When the conductor material is steel of relative permeability 50, the loop inductance per km of the line will be

8.2 mHlkm
7.281 mHlkm
5.0 mHlkm
2 mHlkm

More Power Systems QUESTIONS AND ANSWERS available in next pages

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