143 Session 9- Underground Wiring

What is the main focus of Session 9?

• A) Understanding overhead wiring
• B) Learning about underground wiring
• C) Identifying common types of insulators
• D) Exploring cable routing techniques

What is the advantage of using overhead lines?

• A) They are easier to maintain
• B) They are more cost-efficient than underground wiring
• C) They are less affected by environmental factors
• D) They are safer for wildlife

Which of the following is NOT a component of an overhead wiring system?

• A) Cores or conductors
• B) Metallic sheath
• C) Insulators
• D) Bedding

What is the purpose of armouring in underground cables?

• A) To protect the cable from mechanical damage
• B) To improve the flexibility of the cable
• C) To increase the conductivity of the cable
• D) To provide insulation

What is the main advantage of underground wiring systems?

• A) They are suitable for congested areas where overhead lines may be difficult or impossible to install.
• B) The maintenance cost is very low, as once installed there is very little ongoing maintenance required.
• C) They are not likely to be influenced by shaking and shorting due to vibrations, wind, accidents, etc.
• D) They are not easily damaged when buried at a sufficient depth.

What is the main benefit of underground wiring in congested areas?

• A) Lower installation cost
• B) Higher efficiency
• C) Easier maintenance
• D) Suitable for areas where overhead lines are difficult to install

What is the purpose of the metallic sheath in underground cables?

• A) To protect the cable from mechanical damage
• B) To improve the flexibility of the cable
• C) To increase the conductivity of the cable
• D) To provide insulation

What is the purpose of the insulation around the cores in underground cables?

• A) To protect against moisture
• B) To increase the flexibility of the cable
• C) To provide mechanical protection
• D) To withstand the voltage carried by the cable

What material is commonly used for insulation in underground cables?

• A) Plastic
• B) Rubber
• C) Jute
• D) Impregnated paper

What is the purpose of the bedding in underground cables?

• A) To protect the metallic sheath from corrosion
• B) To provide mechanical protection to the cable
• C) To improve the flexibility of the cable
• D) To increase the conductivity of the cable