ELECTRICAL CABLES QUIZ

Dielectric strength of rubber is around

30 kV/mm

5 kV/mm

25 kV/mm

15 kV/mm

TRUE ANSWER : ?
YOUR ANSWER : ?

Pressure cables are generally not used beyond

132 kV

33 kV

66 kV

11 kV

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Which of the following protects a cable against mechanical injury?

Armouring

Bedding

Sheath

None of the listed here

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In capacitance grading of cables we use a _________ dielectric.

Hygroscopic

Homogeneous

Composite

Porous

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

50 cm

20 cm

30 cm

100 cm

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The thickness of metallic shielding on cables is usually

0.04 mm

0.2 to 0.4 mm

3 to 5 mm

40 to 60 mm

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If the length of a cable is doubled, its capacitance

Becomes one-half

None of the listed here

Becomes double

Becomes one-fourth

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The advantage of oil filled cables is

Smaller overall size

All of the listed here

No ionization, oxidation and formation of voids

More perfect impregnation

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The disadvantage with paper as insulating material is

It has high capacitance

It is hygroscopic

It is an organic material

None of the listed here

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Copper as conductor for cables is used as

Alloy with chromium

Hardened and tempered

Annealed

Hard drawn

TRUE ANSWER : ?
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