Apprentices Assessment Day 2

What is the primary advantage of using aluminium conductors in overhead lines?

• Higher tensile strength than copper

• Lower cost and weight

• Better conductivity than copper

• Easier to install

Which of the following is a common type of overhead line construction?

• Single pole

• Double circuit

• Underground

• Composite

What is the purpose of using insulators in overhead power lines?

• To increase current flow

• To prevent short circuits

• To support conductors and prevent leakage to ground

• To reduce line losses

What is a busbar primarily used for in electrical systems?

• To connect transformers to the grid

• To distribute power to multiple circuits

• To store electrical energy

• To convert AC to DC

Which material is commonly used for busbars due to its excellent conductivity?

• Steel

• Copper

• Aluminum

• Brass

What is the main disadvantage of using a busbar system?

• High installation cost

• Limited load capacity

• Requires frequent maintenance

• Larger physical footprint compared to cables

Which method is commonly used for installing underground conductors?

• Direct burial

• Overhead suspension

• Cable trays

• Surface mounting

What is the purpose of using cable trays in conductor installation?

• To increase insulation resistance

• To provide mechanical support and organization for cables

• To improve thermal conductivity

• To reduce electromagnetic interference

When installing conductors, what factor must be considered to prevent overheating?

• Length of the conductor only

• Ambient temperature and load current

• Type of insulation only

• Colour of the conductor

What are line losses primarily caused by in electrical transmission systems?

• Voltage drops across transformers

• Resistance of conductors

• Poor insulation

• Load imbalances