Electrical Cables
In single core cables armouring is not done to

Avoid excessive sheath losses
Either of the listed here
None of the listed here
Make it flexible

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Electrical Cables
Capacitance grading of cable implies

Use of dielectrics of different permeabilities
Grading according to capacitance of cables per km length
Cables using single dielectric in different concentrations
Capacitance required to be introduced at different lengths to counter the effect of inductance

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