The best lubricants for a machine working at high temperature & load is_________________?
Correct answer: B. Solid lubricant
- A. Grease
- B. Solid lubricant
- C. Animal oils
- D. Mineral oils
Explanation
Solid lubricants such as graphite and molybdenum disulfide retain their lubricating action at temperatures where oils and greases may evaporate, oxidise, or break down. They are therefore preferred for severe high-temperature and high-load conditions.
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