1. Effect of increase in temperature in an overhead transmission line is

- to increase stress and length both
- to decrease stress and length both
- to decrease stress and increase length
- None of the above

2. If span length is doubled with no change in other factors, the sag of the line will become?

- 2 times
- 8 times
- 4 times
- 0.5 times

3. Find the approximate value of sag for a 66 kV line which has a span of 200 m between towers.

- 0.02 m
- 2 m
- 0.2 m
- 20 m

4. The effect of wind pressure is more predominant on

- Supporting tower
- Neutral wires
- Transmission lines
- insulators

5. The sag of a transmission line depends upon

- Weight of conductor and directly proportional to span length
- Weight of conductor and inversely proportional to span length
- Weight of conductor and directly proportional to the square of span length
- Weight of conductor and inversely proportional to the square of span length

6. Sag of the conductor’s between two poles can be determined by

- $S=\frac{WL^2}{T}$
- $S=\frac{WL^2}{2T}$
- $S=\frac{WL^2}{8T}$
- $S=\frac{WL^2}{16T}$

7. The sag of the conductors of a transmission line is 2.5 m when the span is 250 m. Now if the height of the supporting towers is increased by 2.5%, the sag will

- reduce by 25%
- increase by 25%
- reduce by 12.5%
- remain unchanged

8. Effect of temperature rise in overhead lines is to

- increase the sag and decrease the tension
- decrease the sag and increase the tension
- increase both the sag and tension
- decrease both the sag and tension

9. The sag of a transmission line conductor in summer is

- Less than that in winter
- More than that in winter
- Same as in winter
- None of these

10. The sag of a transmission line is least affected owing to

- weight of the conductor
- current through the conductor
- atmospheric temperature
- ice deposition on the conductor