External Plant Underground Cables

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What is the purpose of a moisture barrier in underground cables?

To compactly arrange insulated conductors

To provide mechanical protection

To protect the core from the entry of moisture (correct)

To enhance the quality of insulation

Which factor does NOT contribute to the classification of underground cables based on design features?

Mechanical protection

Place where it is used

Insulation material used

Color of the cables (correct)

What type of cables are needed to protect against damages while handling?

Armoured cables (correct)

Jelly filled cables

Unarmoured cables

Dry core cables

In underground cables, what does the core consist of?

Insulated conductors compactly arranged Signup and view all the answers

Which type of cable is used to protect against induction due to electrical lines?

Armoured cable Signup and view all the answers

What is the function of the filling compound in underground cables?

To prevent moisture entry Signup and view all the answers

What material is used as core wrapping in PIJF cables?

Polyester tape Signup and view all the answers

What is the purpose of core wrappings in a cable?

To provide high di-electric strength from core to shield Signup and view all the answers

What type of compound should be used to fill the cable?

Homogenous and water-resistant compound Signup and view all the answers

What is the purpose of the aluminum tape coated with polythene/copolymer in a cable?

To provide additional insulation Signup and view all the answers

Why should the cable filling compound not contain dirt or metallic particles?

To prevent damage to the conductor insulation Signup and view all the answers

What thickness is required for the aluminum tape applied over the cable core?

0.2 mm Signup and view all the answers

What is the norm for provision of cable conductors in a single exchange area up to 5000 lines?

8 Signup and view all the answers

In which type of system is the provision of cable conductors 10 kilometers per line?

Multi Exchange area up to 20,000 lines (minor District) Signup and view all the answers

What is the norm for provision of cable conductors in a Multi Exchange area beyond 1,00,000 lines (metro - tele districts)?

7 Signup and view all the answers

Why is it mentioned that the cable network need not be waited for the sanctioning of the project in the text?

Due to long execution time for the cable network component Signup and view all the answers

What is the purpose of coordinating all associated cable component works about 3 months in advance of the commissioning of the exchange?

To ensure timely completion of the project Signup and view all the answers

Why are a huge number of laid-cable pairs left unutilized according to the text?

Due to improper planning Signup and view all the answers

What are the two types of equipment mentioned in the text that are currently being used?

10 Pair and 20 DPs Signup and view all the answers

What should be the basis for demarcating the area to be served by each DP?

The demand forecast for the next 3 to 5 years Signup and view all the answers

What should be ensured when demarcating the DP area for external DPs and practical difficulties are encountered?

Kriss crossing of the connections should be avoided Signup and view all the answers

What is the basis for marking the DPs for each block?

The demand forecast for the next 20 years Signup and view all the answers

What factors should be considered when deciding which DPs to open immediately?

The existing development stage of the area and future time schedules Signup and view all the answers

What is the purpose of cabinets mentioned in the text?

To provide flexibility between pillars by means of cross-connection points Signup and view all the answers

What is the recommended number of pillars that a cabinet should serve?

3 to 6 pillars Signup and view all the answers

Where should the cabinet be located in relation to the primary cable route?

On the primary cable route after it enters the cabinet area Signup and view all the answers

Which of the following statements is true regarding the location of cabinets?

There should be sufficient space near the cabinets to accommodate future joints and manholes Signup and view all the answers

What is the recommended relationship between primary cable length and secondary cable length for choosing the location of cabinets?

Primary cable length should be greater than secondary cable length Signup and view all the answers

Which of the following factors governs the optimum number of exchanges?

Line costs, including the cost of subscriber cable network and the cost of local and trunk junctions Signup and view all the answers

What is the recommended relationship between secondary cable length and distribution cable length for choosing the location of pillars?

Secondary cable length should be greater than distribution cable length, except for the first pillar Signup and view all the answers