ELECTRICAL CABLES QUIZ

The thickness of metallic shielding on cables is usually

40 to 60 mm

3 to 5 mm

0.2 to 0.4 mm

0.04 mm

TRUE ANSWER : ?
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If the length of a cable is doubled, its capacitance

Becomes double

Becomes one-fourth

Becomes one-half

None of the listed here

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A cable carrying alternating current has

Hysteresis losses only

Hysteresis and leakage losses only

Hysteresis, leakage and copper losses only

Hysteresis, leakage, copper and friction losses

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In capacitance grading of cables we use a _________ dielectric.

Porous

Hygroscopic

Homogeneous

Composite

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In cables the charging current

Leads the voltage by 180°

Lags the voltage by 180°

Leads the voltage by 90°

Lags the voltage by 90°

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

30 cm

20 cm

50 cm

100 cm

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Cables for 220 kV lines are invariably

Paper insulated

Rubber insulated

Mica insulated

Compressed oil or compressed gas insulated

TRUE ANSWER : ?
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The disadvantage with paper as insulating material is

It is hygroscopic

It is an organic material

It has high capacitance

None of the listed here

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The material for armouring on cable is usually

Galvanized steel wire

Steel tape

Both Steel tape and Galvanized steel wire

None of the listed here

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In the cables, sheaths are used to

Provide enough strength

Provide proper insulation

None of the listed here

Prevent the moisture from entering the cable

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