1. longer life
2. more mechanical strength
3. better workability
4. all of these
Answer: 4. all of these
Explanation:
- Steel towers are commonly used for electric power transmission lines because they have several advantages over other types of transmission towers.
- One advantage of steel towers is that they are strong and durable,and can withstand the weight of the transmission lines and the forces acting on them, such as wind and ice. This makes them suitable for use in areas with extreme weather conditions.
- Another advantage of steel towers is that they can be easily fabricated and erected, which makes them cost-effective compared to other types of transmission towers. Steel towers also have a long service life, which means that they do not need to be replaced as frequently as other types of towers.
- In addition, steel towers are relatively easy to maintain and repair, which makes them a convenient choice for electric power transmission systems.
- Overall, steel towers are used in transmission lines because they are strong, durable, cost-effective, and easy to maintain.
