ELECTRICAL CABLES QUIZ

PVC stands for

Pressed and varnished cloth

Polyvinyl chloride

Positive voltage conductor

Post varnish conductor

TRUE ANSWER : ?
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Low tension cables are generally used up to

600 V

200 V

1000 V

400 V

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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

None of the listed here

Double

One half

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In case of three core flexible cable the color of the neutral is

Black

Brown

Red

Blue

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The thickness of metallic shielding on cables is usually

0.04 mm

0.2 to 0.4 mm

40 to 60 mm

3 to 5 mm

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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

20 cm

100 cm

50 cm

30 cm

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Dielectric strength of rubber is around

5 kV/mm

15 kV/mm

25 kV/mm

30 kV/mm

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In a cable immediately above metallic sheath ________ is provided.

Earthing connection

Bedding

Armouring

None of the listed here

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The insulating material for a cable should have

All of the listed here

High dielectric strength

low cost

High mechanical strength

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The advantage of cables over overhead transmission lines is

Easy maintenance

Can be used in congested areas

Can be used in high voltage circuits

Low cost

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