Multiple choice

Graphite powder is used in machine to ______________.

  1. enhance friction

  2. enhance the lustre

  3. reduce friction

  4. reduce efficiency
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Yes, it is correct. The use of lubricant makes the surface smooth and hence reduce the  friction. One of the lubricants is graphite powder, it fills the unevenness of the two surfaces and seperate them by forming a thin layer in between and so friction reduces.

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