Electrical Cables
In single core cables armouring is not done to

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

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Electrical Cables
Capacitance grading of cable implies

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

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