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Electrical Cables

Electrical Cables
The thickness of metallic shielding on cables is usually

3 to 5 mm
40 to 60 mm
0.04 mm
0.2 to 0.4 mm

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Electrical Cables
Which of the following insulation is used in cables?

All of the listed here
Paper
Varnished cambric
Rubber

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Electrical Cables
Dielectric strength of rubber is around

15 kV/mm
30 kV/mm
5 kV/mm
25 kV/mm

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

Compressed SF6 gas
Vulcanised rubber
Polyvinyle chloride
Impregnated paper

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Electrical Cables
If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be

15 kV/mm
30 kV/mm
5 kV/mm
10 kV/mm

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Electrical Cables
A certain cable has an insulation of relative permittivity 4. If the insulation is replaced by one of relative permittivity 2, the capacitance of the cable will become

Four times
Double
None of the listed here
One half

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