16 Questions
What causes the weed junction between two surfaces?
Contact of asperities of both upper and lower surfaces
Which type of friction results in ploughing and interlocking of surface irregularities?
Sliding friction
What is the relative movement of two surfaces in contact with each other called?
Friction
What gets broken easily due to sliding friction?
Peaks of the softer metal
In which type of friction does a load sphere or cylinder roll over a flat surface?
Rolling friction
What is the main cause of carrying all the loads between two surfaces?
Weed junction
What is the main reason for the lower effect of rolling friction compared to sliding friction?
The coefficient of rolling friction is usually very low.
Which characteristic should a lubricant possess in order to reduce friction between two moving surfaces?
Low carbon residue
Where are solid lubricants commonly used?
For heavy machinery working at very high loads
What is the main characteristic of graphite, a widely used solid lubricant?
Has a layered structure of carbon atoms
In which type of friction is the lubricant less important according to the given information?
Rolling friction
Which type of lubricant classification includes graphite and molybdenum sulphide?
Solid lubricants
What type of bond holds the adjacent layers of carbon atoms together in graphite?
Vanderwaals force
In which condition is the coefficient of sliding friction much larger according to the text?
Static condition
What happens if the frictional heat reaches the melting temperature of the material, according to the text?
It forms a welded junction.
What should be the flash and fire points of a lubricant in comparison to the operating temperature of the machine?
Higher than the operating temperature
Test your knowledge about the interaction of solid surfaces and the role of lubricants in reducing friction and wear. This quiz covers the concept of surface asperities, contact between solid surfaces, and the formation of a weed junction.
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