ELECTRICAL CABLES QUIZ

Underground cables are laid at sufficient depth

To avoid being unearthed easily due to removal of soil

All of the listed here

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

To minimize temperature stresses

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following protects a cable against mechanical injury?

Bedding

Sheath

Armouring

None of the listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

Capacitance grading of cable implies

Cables using single dielectric in different concentrations

Use of dielectrics of different permeabilities

Grading according to capacitance of cables per km length

Capacitance required to be introduced at different lengths to counter the effect of inductance

TRUE ANSWER : ?
YOUR ANSWER : ?

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

30 kV/mm

10 kV/mm

TRUE ANSWER : ?
YOUR ANSWER : ?

Cables, generally used beyond 66 kV are

S.L. type

Armoured

Oil filled

Belted

TRUE ANSWER : ?
YOUR ANSWER : ?

In cables the charging current

Lags the voltage by 90°

Leads the voltage by 180°

Lags the voltage by 180°

Leads the voltage by 90°

TRUE ANSWER : ?
YOUR ANSWER : ?

In single core cables armouring is not done to

Make it flexible

Either of the listed here

Avoid excessive sheath losses

None of the listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

In a cable the voltage stress is maximum at

Insulator

Core of the conductor

Surface of the conductor

Sheath

TRUE ANSWER : ?
YOUR ANSWER : ?

High tension cables are generally used up to

33 kV

132 kV

11 kV

66 kV

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

50 cm

20 cm

100 cm

30 cm

TRUE ANSWER : ?
YOUR ANSWER : ?