SAG and SAG calculation - MCQs with answers

SAG and SAG calculation - MCQs with answers

Q1. Sag depends on which factor?

a. Span length.
b. Weight of the conductors.
c. Tension in the conductors.
d. All of the above.

View Answer / Hide Answer

Q2. What is the shape that is attained by the conductors if suspended from the same height?

a. Parabola.
b. Catenary.
c. Semi circle
d. None of these.

View Answer / Hide Answer

Q3. Conductor sag should be kept

a. Minimum
b. Maximum.
c. Zero.
d. None of these.

View Answer / Hide Answer

Q4. What is the minimum safety factor in respect of the conductor tension?

a. 1
b. 3
c. 2
d. 1.5

View Answer / Hide Answer

Q5. A 132 kV transmission line, with the weight of conductor = 680 kg/km, length of span = 260 m, ultimate strength = 3100 kg, safety factor =2. Calculate the height above ground at which the conductor should be supported. Ground clearance required is 10 m.

a. 10.7 m
b. 13.7 m
c. 20.83 m
d. 18.75 m

View Answer / Hide Answer

Q6. Sag is directly proportional to the square of span.

a. True
b. False.

View Answer / Hide Answer

Q7. The maximum tension in a section of overhead line conductor between two supports of unequal height occurs at

a. The higher support.
b. The lower support.
c. Midpoint of the conductors.
d. None of these.

View Answer / Hide Answer

Q8. Safety factor is the ratio of

a. Working stress to breaking stress.
b. Breaking stress to working stress.
c. 1 / breaking stress.
d. 1 / working stress.

View Answer / Hide Answer

Q9. What is the effect of temperature rise on the over head lines?

a. Increase the sag and decrease the tension.
b. Decrease the sag and increase the tension.
c. Both increases.
d. Both decreases.

View Answer / Hide Answer

Q10. A transmission line has a span of 250 metres between the line supports. The conductors has a cross sectional area of 1.29 cm² and weighs 1170 kg/km and has a breaking stress of 4218 kg/cm². Calculate the sag and vertical sag with a safety factor of 5, with a wind pressure of 122 kg per square metre of the projected area.

a. 14 and 5.37
b. 16 and 8.39
c. 14 and 8.39
d. 15 and 5.37

View Answer / Hide Answer