Physics Quiz

Which of the following materials should be used to reduce friction?

• Materials with a higher coefficient of friction

• Materials with a lower coefficient of friction

• Materials with the same coefficient of friction

• Materials with no coefficient of friction

What is the purpose of introducing a fluid film between moving parts?

• To increase friction

• To separate the parts slightly and reduce friction

• To make the parts stick together

• To increase the weight of the parts

What is an example of a semi-solid lubricant?

• Oil

• Grease

• Water

• Air

What is the term used to describe lubrication when the lubricant is dynamic?

• Static lubrication

• Hydrodynamic lubrication

• Boundary lubrication

• Mixed lubrication

What are examples of dry lubricants?

• Animal fats and plant seeds

• Hydrocarbons and chemicals

• Molybdenum disulphide and graphite

• Grease and mineral oils

Which of the following additives is used to prevent oxidation in lubricants?

• Foam depressants

• Corrosion inhibitors

• Anti oxidants

• Detergent dispersers

What is the purpose of foam depressants in lubricants?

• To improve oiliness

• To prevent corrosion

• To reduce foam formation

• To act as a detergent

Which type of lubricant is used for rolling bearings with an oil mist system?

• Oil

• Grease

• Water

• Silicone

What is the maintenance cost for gears using grease with a hand lubricating system?

• Low

• Moderate

• High

• Nil

What happens if the relief valve fails in a circulation system?

• Oil pressure may become too high

• Oil will not be filtered

• Oil will not circulate

• Oil will become too cold