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Electrical Cables

Electrical Cables
Empire tape is

Varnished cambric
None of the listed here
Vulcanized rubber
Impregnated paper

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Electrical Cables
Cables for 220 kV lines are invariably

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

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Electrical Cables
Underground cables are laid at sufficient depth

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

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Electrical Cables
The breakdown voltage of a cable depends on

Working temperature
Time of application of the voltage
Presence of moisture
All of the listed here

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Electrical Cables
The electrostatic stress in underground cables is

Same at the conductor and the sheath
Minimum at the conductor and maximum at the sheath
Zero at the conductor as well as on the sheath
Maximum at the conductor and minimum at the sheath

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Electrical Cables
PVC stands for

Post varnish conductor
Pressed and varnished cloth
Positive voltage conductor
Polyvinyl chloride

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