Carbon bearings are used under which of the following conditions ?
A. Where lubrication is difficult or im-possible
B. Where corrosive chemical action exists
C. Where high temperature exists
D. All of the above
Answer: Option D
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Carbon is used where oil or grease lubricated bearings could be used only with difficulty, if at all. Carbon can run dry or in fluids which are corrosive or unsuitable as lubri- cants with other bearing material.