ELECTRICAL CABLES QUIZ

The surge resistance of cable is

500 ohms

100 ohms

5 ohms

50 ohms

TRUE ANSWER : ?
YOUR ANSWER : ?

The inter sheaths in the cables are used to

None of the listed here

Provide proper stress distribution

Avoid the requirement of good insulation

Minimize the stress

TRUE ANSWER : ?
YOUR ANSWER : ?

If the length of a cable is doubled, its capacitance

Becomes one-half

None of the listed here

Becomes one-fourth

Becomes double

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Double

None of the listed here

Four times

One half

TRUE ANSWER : ?
YOUR ANSWER : ?

The insulating material should have

High resistivity

All of the listed here

High dielectric strength

Low permittivity

TRUE ANSWER : ?
YOUR ANSWER : ?

Dielectric strength of rubber is around

15 kV/mm

25 kV/mm

30 kV/mm

5 kV/mm

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Both Inter-sheaths and Insulating materials with different dielectric constants

None of the listed here

Insulating materials with different dielectric constants

Inter-sheaths

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following insulation is used in cables?

All of the listed here

Varnished cambric

Rubber

Paper

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 : ?

The material for armouring on cable is usually

Galvanized steel wire

None of the listed here

Steel tape

Both Steel tape and Galvanized steel wire

TRUE ANSWER : ?
YOUR ANSWER : ?

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