Which of the following cannot be used as a lubricant? a. Rubber sheet b. Grease C. Graphite d. Air cushion
Answers
Answer:
Paper is not a lubricant as it is itself a rough surface, and cannot be used as a lubricant. So, the correct answer is “Option D”. Note: Lubricants are very much necessary in industries because huge machines create a lot of friction and would get damaged easily.
Explanation:
- Sand is not a lubricant.
- Graphite is used as a lubricant.
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Answer:
a. rubber sheet
Explanation:
Rubber creates friction.
Rubber needs to be lubricated to protect it from moving parts in systems such as o-rings in a cylinder piston. If the rubber is not lubricated the friction caused by the contact of the moving part may rupture the rubber.
Therefore, we can use the rest of three materials directly for lubrication. But in the case of rubber, firstly the rubber needs to be lubricated and then it can be used between moving parts of a machine as lubricant.
And also rubber needs to be lubricated time-to-time either by oil or grease.