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Question

Which of the following is true with respect to cryogenics being used in power transmission?


  1. It is used to keep the overhead transmission cables cool by increasing their resistance.

  2. It is used to keep the overhead transmission cables cool by decreasing their resistance.

  3. It is used to keep the underground cables cool by increasing their resistance.

  4. It is used to keep the underground cables cool by decreasing their resistance.


Solution

The correct option is D

It is used to keep the underground cables cool by decreasing their resistance.


The underground cables used for transmission of electricity tend to get heated up. This increases their resistance and hence the power loss. Cryogenics is used to cool them so that power loss can be minimized by decreasing the resistance.

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