If a power cable and a communication cable are to run parallel the minimum distance between the two, to avoid interference should be

The breakdown voltage of a cable depends on

The disadvantage with paper as insulating material is

The advantage of oil filled cables is

The insulating material should have

Copper as conductor for cables is used as

Is a cable is to be designed for use on 1000 kV, which insulation would you prefer?

Cables for 220 kV lines are invariably

The advantage of cables over overhead transmission lines is

In case of three core flexible cable the colour of the neutral is