To keep machines running smoothly and to avoid wear and tear of machines, the best and the most commonly used lubricant is:
Why are lubricants (oil or grease) applied to rubbing surfaces of machines?
Which of the following substances is/are used as a fuel to run machines?
Applying lubricants to machines increases their efficiency.
Graphite is used as a lubricant in machines because it has a very high melting point and also it :