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Transmission & Distribution

Transmission & Distribution
As a mater of economy, voltage for power transmission should be

Medium
High
Low
None of the listed here

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Transmission & Distribution
Skin effect only exist in

Low voltage dc overhead transmission
Ac transmission
Cables carrying dc current
High voltage dc overhead transmission

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Transmission & Distribution
Skin effect is proportional to

(conductor diameter)4
None of these
(conductor diameter)3
(conductor diameter)1/2
(conductor diameter)2

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Transmission & Distribution
The following system is not generally used

1-phase 3-wire
3-phase 3-wire
1-phase 4-wire
3-phase 4-wire

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Transmission & Distribution
If variable part of annual cost on account of interest and depreciation on the capital outlay is equal to the annual cost of electrical energy wasted in the conductors, the total annual cost will be minimum and the corresponding size of conductor will be most economical. This statement is known as

Faraday's law
Kelvin's law
Ohm's law
Kirchhoff's law

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Transmission & Distribution
The power transmitted will be maximum when

Corona losses are minimum
Receiving end voltage is more
Reactance is high
Sending end voltage is more

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