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Electrical Cables

Electrical Cables
The bedding on a cable consists of

None of the listed here
Jute
Hessian cloth
Both Hessian cloth and Jute

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Electrical Cables
Cables for 220 kV lines are invariably

Mica insulated
Rubber insulated
Compressed oil or compressed gas insulated
Paper insulated

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Electrical Cables
The relative permittivity of rubber is

None of the listed here
Between 2 and 3
Between 5 and 7
Between 8 and 9

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Electrical Cables
Underground cables are laid at sufficient depth

To minimize temperature stresses
To minimize the effect of shocks and vibrations due to gassing vehicles, etc.
To avoid being unearthed easily due to removal of soil
All of the listed here

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Electrical Cables
The advantage of oil filled cables is

All of the listed here
More perfect impregnation
Smaller overall size
No ionization, oxidation and formation of voids

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Electrical Cables
The inter sheaths in the cables are used to

Avoid the requirement of good insulation
Minimize the stress
Provide proper stress distribution
None of the listed here

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