Electrical Cables
The insulating material should have

Low permittivity
All of the listed here
High resistivity
High dielectric strength

ANSWER DOWNLOAD EXAMIANS APP

Electrical Cables
Solid type cables are considered unreliable beyond 66 kV because

There is a danger of breakdown of insulation due to the presence of voids
Insulation may melt due to higher temperature
Skin effect dominates on the conductor
Of corona loss between conductor and sheath material

ANSWER DOWNLOAD EXAMIANS APP