ELECTRICAL CABLES QUIZ

The material for armouring on cable is usually

Steel tape

Galvanized steel wire

Both Steel tape and Galvanized steel wire

None of the listed here

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The advantage of cables over overhead transmission lines is

Can be used in congested areas

Can be used in high voltage circuits

Easy maintenance

Low cost

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

Insulation layer

Armour

Conductor surface

Sheath

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Low tension cables are generally used up to

400 V

600 V

1000 V

200 V

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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

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The inter sheaths in the cables are used to

Avoid the requirement of good insulation

Minimize the stress

Provide proper stress distribution

None of the listed here

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A cable carrying alternating current has

Hysteresis and leakage losses only

Hysteresis, leakage and copper losses only

Hysteresis, leakage, copper and friction losses

Hysteresis losses only

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Dielectric strength of rubber is around

25 kV/mm

15 kV/mm

30 kV/mm

5 kV/mm

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Pressure cables are generally not used beyond

66 kV

11 kV

132 kV

33 kV

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The insulating material should have

High resistivity

All of the listed here

Low permittivity

High dielectric strength

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