What maintenance of earth electrodes should be done?

What maintenance of earth electrodes should be done?
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Answer :

The neighbouring soil to the earth electrode shall be kept moist where necessary, by periodically pouring water through a pipe where fitted along with it or by pouring water in the immediate vicinity of the earth electrode. Periodical visual inspection of all earth electrodes connection wherever available, shall be carried out to ensure their rigidity and other signs of deterioration. 
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Which of the following statements, concerning the general maintenance of a brushless generator, is correct? A. Paint should be applied to insulating surfaces on an annual basis. B. Alcohol should be used to remove dust and grime from windings. C. High pressure air should be used to blow out carbon dust. D. Accessible generator parts should be wiped with a clean dry rag on a periodic basis.

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Last Answer : Answer: D

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