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Question

Choose the INCORRECT statement with respect to DC transmission systems. 

A.

The potential stress on the insulation is less in case of a DC system than that in case of an AC system, for the same working voltage. 

B.

Electric power can be generated at a high DC voltage for a DC transmission system. 

C.

There is no skin effect is the transmission line in a DC transmission system. 

D.

It has less corona loss and reduced interference with communication circuits.

Answer ( Option B)

Electric power can be generated at a high DC voltage for a DC transmission system. 

Solution

DC transmission system have many advantage over transmission line

1. Less corona loss

2. Reduced interference

3. No skin effect

4. Less costly for long transmission line

5. Potential stress on the insulation is less in case of DC system.

Disadvantage : Electric power can be generated at a high DC voltage for a DC transmission system.

Hence, the correct option is (B).

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