Overhead and Underground Cables Quiz

What is the primary advantage of underground cables over overhead lines?

• Higher maintenance costs

• Less susceptible to weather and environmental damage

• Easier and quicker to install

• Higher capacity for voltage transmission

Which type of cable is typically used for high voltage overhead transmission lines?

• Coaxial cable

• Twisted pair cable

• Fiber optic cable

• Aluminum conductor steel reinforced (ACSR) cable

What is the main reason for insulating underground cables?

• To prevent interference with nearby cables

• To protect against water and chemical damage

• To ensure they are visible during excavations

• To increase the transmission speed of electricity

Which of the following is a disadvantage of overhead cables?

• Lower initial installation cost

• Aesthetic impact on the landscape

• Reduced risk of cable theft

• Lower risk of damage from digging activities

What is the typical material used for the insulation of high-voltage underground cables?

• PVC

• Rubber

• Cross-linked polyethylene (XLPE)

• Fiber optics

Why are overhead cables often spaced apart on transmission towers?

• To reduce the weight on the tower

• To minimize the risk of electrical arcing

• To improve the cable's visibility for aircraft

• To make maintenance work easier

What is a common method to increase the capacity of existing overhead transmission lines without changing the cables?

• Increasing the height of the towers

• Adding more cables to the existing towers

• Using higher voltage transformers

• Cooling the cables to reduce resistance

In what scenario might overhead cables be preferred over underground cables?

• In densely populated urban areas

• For crossing bodies of water

• In areas with a high risk of seismic activity

• For short distance, low voltage applications

What is a significant challenge associated with the repair of underground cables?

• Identifying the exact location of the fault

• Preventing wildlife from damaging the cables further

• Ensuring that the repair does not disrupt traffic

• Keeping the repair costs lower than for overhead cables

Which of the following is a benefit of using overhead cables for electricity transmission?

• They have a lower overall lifetime cost

• They are less likely to be damaged by digging and excavation activities

• They can easily be upgraded to higher voltages

• They offer better insulation properties