OHTL Design Engineering Technical Assessment – Level 1

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OHTL Design Engineering Quiz

EMF • Overhead Ground Wires • Shielding • Lightning • Transposition

15 Multiple Choice Questions

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Technical Assessment 15 Questions

1. At what height shall electric and magnetic fields be evaluated at the edge of the ROW?

A. 1.0 m B. 1.5 m C. 1.7 m D. 2.0 m

2. What is the maximum acceptable electric field reference level specified by ICNIRP?

A. 2 kV/m B. 5 kV/m C. 10 kV/m D. 15 kV/m

3. What is the maximum acceptable magnetic field reference level specified by ICNIRP?

A. 50 µT B. 100 µT C. 200 µT D. 500 µT

4. Electric and magnetic fields are commonly referred to collectively as:

A. Radio Frequency Fields B. Electrostatic Fields C. Electromagnetic Fields (EMF) D. Lightning Fields

5. What is the primary purpose of overhead ground wires on a transmission line?

A. To increase conductor capacity B. To reduce conductor sag C. To shield line conductors from direct lightning strokes D. To improve power factor

6. What is the maximum shielding angle specified for a 380 kV transmission line?

A. 15° B. 20° C. 25° D. 30°

7. What is the maximum shielding angle specified for transmission lines from 69 kV to 230 kV?

A. 15° B. 20° C. 30° D. 45°

8. What is the maximum permissible lightning outage rate for 230 kV and 380 kV transmission lines?

A. 0.25 per 100 km per year B. 0.62 per 100 km per year C. 1.24 per 100 km per year D. 2.50 per 100 km per year

9. What is the maximum permissible lightning outage rate for 69 kV, 110 kV, 115 kV and 132 kV transmission lines?

A. 0.62 per 100 km per year B. 0.75 per 100 km per year C. 1.24 per 100 km per year D. 2.00 per 100 km per year

10. For a 90–270 km long transmission line, how many complete transposition barrels are required?

A. None B. One C. Two D. Three

11. For a transmission line longer than 270 km, how many complete transposition barrels are required?

A. One B. Two C. Three D. Four

12. For a 90–270 km transmission line, one complete transposition barrel consists of:

A. One transposition structure and two sections B. Two transposition structures and three equal sections of L/3 C. Three transposition structures and four equal sections D. Five transposition structures and six equal sections

13. For a transmission line longer than 270 km, two complete transposition barrels consist of:

A. Three transposition structures and four sections B. Four transposition structures and five sections C. Five transposition structures and six equal sections of L/6 D. Six transposition structures and seven sections

14. What is the primary purpose of transposition in a transmission line?

A. To increase tower strength B. To reduce conductor sag C. To maintain electrical balance by changing the relative phase positions D. To eliminate lightning completely

15. On double-circuit lines, what should be done with the relative phasing sequence after transposition?

A. Keep the same sequence throughout B. Randomly change the phase sequence C. Keep the relative phasing sequence in reversed order D. Remove the phase sequence at transposition structures

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15 Total Questions

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OHTL Design Engineering Technical Assessment – Level 1

OHTL Design Engineering Quiz

Candidate Enrollment

1. At what height shall electric and magnetic fields be evaluated at the edge of the ROW?

2. What is the maximum acceptable electric field reference level specified by ICNIRP?

3. What is the maximum acceptable magnetic field reference level specified by ICNIRP?

4. Electric and magnetic fields are commonly referred to collectively as:

5. What is the primary purpose of overhead ground wires on a transmission line?

6. What is the maximum shielding angle specified for a 380 kV transmission line?

7. What is the maximum shielding angle specified for transmission lines from 69 kV to 230 kV?

8. What is the maximum permissible lightning outage rate for 230 kV and 380 kV transmission lines?

9. What is the maximum permissible lightning outage rate for 69 kV, 110 kV, 115 kV and 132 kV transmission lines?

10. For a 90–270 km long transmission line, how many complete transposition barrels are required?

11. For a transmission line longer than 270 km, how many complete transposition barrels are required?

12. For a 90–270 km transmission line, one complete transposition barrel consists of:

13. For a transmission line longer than 270 km, two complete transposition barrels consist of:

14. What is the primary purpose of transposition in a transmission line?

15. On double-circuit lines, what should be done with the relative phasing sequence after transposition?

Assessment Result

Answer Review

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OHTL Design Engineering Quiz

Candidate Enrollment

1. At what height shall electric and magnetic fields be evaluated at the edge of the ROW?

2. What is the maximum acceptable electric field reference level specified by ICNIRP?

3. What is the maximum acceptable magnetic field reference level specified by ICNIRP?

4. Electric and magnetic fields are commonly referred to collectively as:

5. What is the primary purpose of overhead ground wires on a transmission line?

6. What is the maximum shielding angle specified for a 380 kV transmission line?

7. What is the maximum shielding angle specified for transmission lines from 69 kV to 230 kV?

8. What is the maximum permissible lightning outage rate for 230 kV and 380 kV transmission lines?

9. What is the maximum permissible lightning outage rate for 69 kV, 110 kV, 115 kV and 132 kV transmission lines?

10. For a 90–270 km long transmission line, how many complete transposition barrels are required?

11. For a transmission line longer than 270 km, how many complete transposition barrels are required?

12. For a 90–270 km transmission line, one complete transposition barrel consists of:

13. For a transmission line longer than 270 km, two complete transposition barrels consist of:

14. What is the primary purpose of transposition in a transmission line?

15. On double-circuit lines, what should be done with the relative phasing sequence after transposition?

Assessment Result

Answer Review

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