ELECTRICAL CABLES QUIZ

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

5 kV/mm

10 kV/mm

30 kV/mm

TRUE ANSWER : ?
YOUR ANSWER : ?

The breakdown of insulation of the cable can be avoided economically by the use of

Insulating materials with different dielectric constants

Both Inter-sheaths and Insulating materials with different dielectric constants

None of the listed here

Inter-sheaths

TRUE ANSWER : ?
YOUR ANSWER : ?

The thickness of metallic shielding on cables is usually

0.2 to 0.4 mm

40 to 60 mm

3 to 5 mm

0.04 mm

TRUE ANSWER : ?
YOUR ANSWER : ?

The relative permittivity of rubber is

Between 8 and 9

None of the listed here

Between 2 and 3

Between 5 and 7

TRUE ANSWER : ?
YOUR ANSWER : ?

Dielectric strength of rubber is around

5 kV/mm

15 kV/mm

30 kV/mm

25 kV/mm

TRUE ANSWER : ?
YOUR ANSWER : ?

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

100 cm

30 cm

50 cm

20 cm

TRUE ANSWER : ?
YOUR ANSWER : ?

Underground cables are laid at sufficient depth

To minimize the effect of shocks and vibrations due to gassing vehicles, etc.

All of the listed here

To avoid being unearthed easily due to removal of soil

To minimize temperature stresses

TRUE ANSWER : ?
YOUR ANSWER : ?

In cables the charging current

Leads the voltage by 90°

Lags the voltage by 180°

Lags the voltage by 90°

Leads the voltage by 180°

TRUE ANSWER : ?
YOUR ANSWER : ?

In capacitance grading of cables we use a _________ dielectric.

Composite

Hygroscopic

Homogeneous

Porous

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

Polyvinyle chloride

Vulcanised rubber

Impregnated paper

Compressed SF6 gas

TRUE ANSWER : ?
YOUR ANSWER : ?