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Transmission & Distribution

Transmission & Distribution
The effect of wind pressure is more predominant on

Transmission lines
Neutral wires
Supporting towers
Insulators

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Transmission & Distribution
220 kV transmission line voltage is economical for a distance of

400 km
100 km
22 km
200 km

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Transmission & Distribution
When a conductor carries more current on the surface as compared to core, it is due to

Permeability variation
Unsymmetrical fault
Corona
Skin effect

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Transmission & Distribution
The cause of damage to the lead sheath of a cable is

chemical action on the lead when buried in the earth
crystallisation of the lead through vibration
mechanical damage
all of these

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Transmission & Distribution
In transmission lines the cross-arms are made of

Wood
R.C.C.
Steel
Copper

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Transmission & Distribution
As the thickness of the insulation of a cable increases, its capacitance

Decreases
Remains same
None of the listed here
Increases

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