Which of the following are dry lubricants
a) finely grinded graphite
b) Talcum powder
C) Boric acid
d) all of these
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(d) all the above are dyr lubricants
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According to the data mentioned in the question that,
Among the given four options,the correct answer of this question is option "D.";"All of these."
We mainly use liquid oils as the lubricant substances.
But in some cases we use dry lubricant substances also. (especially in the cases where we strictly can't use liquid or moist substances)
Boric acid, graphite powder, talcum powder are great dry lubricants ,due to their perfectly round small particles which decreases the friction.
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