ELECTRICAL CABLES QUIZ

In a cable, the maximum stress under operating conditions is at

Sheath

Armour

Insulation layer

Conductor surface

TRUE ANSWER : ?
YOUR ANSWER : ?

In capacitance grading of cables we use a _________ dielectric.

Hygroscopic

Homogeneous

Composite

Porous

TRUE ANSWER : ?
YOUR ANSWER : ?

The relative permittivity of rubber is

Between 8 and 9

None of the listed here

Between 5 and 7

Between 2 and 3

TRUE ANSWER : ?
YOUR ANSWER : ?

In single core cables armouring is not done to

Avoid excessive sheath losses

None of the listed here

Either of the listed here

Make it flexible

TRUE ANSWER : ?
YOUR ANSWER : ?

A cable carrying alternating current has

Hysteresis, leakage, copper and friction losses

Hysteresis, leakage and copper losses only

Hysteresis losses only

Hysteresis and leakage losses only

TRUE ANSWER : ?
YOUR ANSWER : ?

Dielectric strength of rubber is around

30 kV/mm

25 kV/mm

5 kV/mm

15 kV/mm

TRUE ANSWER : ?
YOUR ANSWER : ?

The thickness of metallic shielding on cables is usually

0.04 mm

3 to 5 mm

40 to 60 mm

0.2 to 0.4 mm

TRUE ANSWER : ?
YOUR ANSWER : ?

Cables for 220 kV lines are invariably

Rubber insulated

Compressed oil or compressed gas insulated

Paper insulated

Mica insulated

TRUE ANSWER : ?
YOUR ANSWER : ?

In the cables, sheaths are used to

Provide proper insulation

Prevent the moisture from entering the cable

Provide enough strength

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 : ?

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