Podcast
Questions and Answers
What is the primary definition of friction between two surfaces?
What is the primary definition of friction between two surfaces?
- Corrosion control between the surfaces
- Lubrication of the surfaces
- Resistance to motion or attempted motion (correct)
- Reduction of wear on the surfaces
What can microscopic analysis of smooth surfaces reveal?
What can microscopic analysis of smooth surfaces reveal?
- Lubricant properties
- Absolutely smooth surfaces
- Corrosion effects
- Countless surface irregularities (correct)
What is the primary function of lubrication in relation to surface irregularities?
What is the primary function of lubrication in relation to surface irregularities?
- To increase friction between surfaces
- To separate surfaces with interlocking surface irregularities (correct)
- To control corrosion between surfaces
- To create surface irregularities
Which of the following is NOT a purpose of lubricants?
Which of the following is NOT a purpose of lubricants?
Why do surfaces cling or weld together when they rub against each other?
Why do surfaces cling or weld together when they rub against each other?
What are the two most important purposes of lubricants?
What are the two most important purposes of lubricants?
What is the primary purpose of the thickening agent in semi-solid lubricants?
What is the primary purpose of the thickening agent in semi-solid lubricants?
Which type of grease is suitable for use in high-temperature applications?
Which type of grease is suitable for use in high-temperature applications?
What is a characteristic of calcium base greases?
What is a characteristic of calcium base greases?
What is the advantage of using grease lubrication over liquid lubrication?
What is the advantage of using grease lubrication over liquid lubrication?
Which type of grease is suitable for use in wet conditions?
Which type of grease is suitable for use in wet conditions?
What is the primary application of specialty greases?
What is the primary application of specialty greases?
Which type of lubricant is divided into three general classes?
Which type of lubricant is divided into three general classes?
What is the characteristic of aluminum base greases that makes them unsuitable for high-speed applications?
What is the characteristic of aluminum base greases that makes them unsuitable for high-speed applications?
What is the advantage of using grease-lubricated bearings?
What is the advantage of using grease-lubricated bearings?
What is a characteristic of mixed base greases?
What is a characteristic of mixed base greases?
What is the primary function of a lubricant in reducing wear?
What is the primary function of a lubricant in reducing wear?
What is the result of a continuous wearing process on surfaces?
What is the result of a continuous wearing process on surfaces?
What is the purpose of chemical compounds added to lubricants?
What is the purpose of chemical compounds added to lubricants?
How do lubricants reduce the production of heat in bearings?
How do lubricants reduce the production of heat in bearings?
What is the primary function of a lubricant in shock absorption?
What is the primary function of a lubricant in shock absorption?
What is the main characteristic of solid lubricants?
What is the main characteristic of solid lubricants?
What is the purpose of a corrosion barrier film formed by a lubricant?
What is the purpose of a corrosion barrier film formed by a lubricant?
What is the primary function of lubricants in sealing?
What is the primary function of lubricants in sealing?
What is the purpose of circulating large quantities of lubricant to bearings?
What is the purpose of circulating large quantities of lubricant to bearings?
What are the three general classes of lubricants?
What are the three general classes of lubricants?
What is the characteristic of fixed oils?
What is the characteristic of fixed oils?
What is the primary function of synthetic oils in lubrication?
What is the primary function of synthetic oils in lubrication?
What is the measure of the resistance of a liquid to internal deformation or shear?
What is the measure of the resistance of a liquid to internal deformation or shear?
What happens to the viscosity of oil when its temperature increases?
What happens to the viscosity of oil when its temperature increases?
What is the unit of measurement for the viscosity of oil using a Saybolt viscometer?
What is the unit of measurement for the viscosity of oil using a Saybolt viscometer?
What is the purpose of the viscosity index of an oil?
What is the purpose of the viscosity index of an oil?
What is the significance of the pour point of oil?
What is the significance of the pour point of oil?
What is the purpose of the flash point of an oil?
What is the purpose of the flash point of an oil?
What is the significance of the neutralization number of oil?
What is the significance of the neutralization number of oil?
What is the purpose of additives in lubricating oil?
What is the purpose of additives in lubricating oil?
What is the purpose of pour point depressants in lubricating oils?
What is the purpose of pour point depressants in lubricating oils?
What type of oil is often used in steam turbines to reduce the risk of ignition?
What type of oil is often used in steam turbines to reduce the risk of ignition?
What is a critical property of air compressor cylinder oils?
What is a critical property of air compressor cylinder oils?
Why are corrosion inhibitors added to internal combustion engine oils?
Why are corrosion inhibitors added to internal combustion engine oils?
What is the purpose of viscosity index improvers in lubricating oils?
What is the purpose of viscosity index improvers in lubricating oils?
What is the primary function of lubricating oils in a turbine circulating system?
What is the primary function of lubricating oils in a turbine circulating system?
What type of oil is preferred for enclosed gears, such as turbine reduction gears?
What type of oil is preferred for enclosed gears, such as turbine reduction gears?
What is the purpose of anti-oxidant additives in internal combustion engine oils?
What is the purpose of anti-oxidant additives in internal combustion engine oils?
What is the significance of the floc point in refrigeration compressor oils?
What is the significance of the floc point in refrigeration compressor oils?
What is the purpose of detergent dispersants in refrigeration compressor oils?
What is the purpose of detergent dispersants in refrigeration compressor oils?
What is the primary reason for the interlocking of surface irregularities?
What is the primary reason for the interlocking of surface irregularities?
What is the main purpose of lubrication in relation to surface irregularities?
What is the main purpose of lubrication in relation to surface irregularities?
What is the result of the interlocking of surface irregularities?
What is the result of the interlocking of surface irregularities?
What is the primary purpose of lubrication in relation to friction?
What is the primary purpose of lubrication in relation to friction?
What is the primary function of lubricants in wear reduction?
What is the primary function of lubricants in wear reduction?
What is the primary reason for using lubricants in corrosion control?
What is the primary reason for using lubricants in corrosion control?
What is the main advantage of using a lubricant to separate two moving surfaces?
What is the main advantage of using a lubricant to separate two moving surfaces?
What is the primary reason why grease is less likely to drip or splash from bearings compared to liquid lubricants?
What is the primary reason why grease is less likely to drip or splash from bearings compared to liquid lubricants?
What is the purpose of chemical compounds added to lubricants?
What is the purpose of chemical compounds added to lubricants?
What is the primary advantage of using mixed base greases over calcium base greases?
What is the primary advantage of using mixed base greases over calcium base greases?
What is the characteristic of solid lubricants that makes them suitable for use with heavy loads or extreme temperatures?
What is the characteristic of solid lubricants that makes them suitable for use with heavy loads or extreme temperatures?
What is the primary characteristic of sodium base greases that makes them suitable for high-speed ball and roller bearings?
What is the primary characteristic of sodium base greases that makes them suitable for high-speed ball and roller bearings?
What is the primary function of lubricants in relation to surface irregularities?
What is the primary function of lubricants in relation to surface irregularities?
What is the primary disadvantage of using aluminum base greases in high-speed applications?
What is the primary disadvantage of using aluminum base greases in high-speed applications?
What is the purpose of lubricants in reducing wear?
What is the purpose of lubricants in reducing wear?
What is the primary purpose of using specialty greases in heavily loaded machinery?
What is the primary purpose of using specialty greases in heavily loaded machinery?
What is the primary function of lubricants in sealing?
What is the primary function of lubricants in sealing?
What is the purpose of lubricants in temperature control?
What is the purpose of lubricants in temperature control?
What is the primary characteristic of barium and lithium base greases that makes them suitable for high-temperature service?
What is the primary characteristic of barium and lithium base greases that makes them suitable for high-temperature service?
What is the primary reason why grease is more convenient to handle and replenish compared to liquid lubricants?
What is the primary reason why grease is more convenient to handle and replenish compared to liquid lubricants?
What is the primary function of lubricants in shock absorption?
What is the primary function of lubricants in shock absorption?
What is the main advantage of using lubricants in corrosive environments?
What is the main advantage of using lubricants in corrosive environments?
What is the primary characteristic of mineral oils that makes them the most commonly used class of lubricants?
What is the primary characteristic of mineral oils that makes them the most commonly used class of lubricants?
What is the primary function of lubricants in reducing friction?
What is the primary function of lubricants in reducing friction?
What is the primary reason why calcium base greases are not suitable for use in high-temperature applications?
What is the primary reason why calcium base greases are not suitable for use in high-temperature applications?
What is the primary advantage of using grease-lubricated bearings over liquid lubricants?
What is the primary advantage of using grease-lubricated bearings over liquid lubricants?
What is the primary characteristic of lubricating oils with a high viscosity index?
What is the primary characteristic of lubricating oils with a high viscosity index?
What is the primary function of carbon residue testing in lubricating oils?
What is the primary function of carbon residue testing in lubricating oils?
What is the primary effect of temperature on the viscosity of lubricating oils?
What is the primary effect of temperature on the viscosity of lubricating oils?
What is the primary purpose of detergent-dispersant additives in lubricating oils?
What is the primary purpose of detergent-dispersant additives in lubricating oils?
What is the primary characteristic of fixed oils?
What is the primary characteristic of fixed oils?
What is the primary function of the flash point of a lubricating oil?
What is the primary function of the flash point of a lubricating oil?
What is the primary effect of a low pour point on the lubricating properties of an oil?
What is the primary effect of a low pour point on the lubricating properties of an oil?
What is the primary function of anti-oxidant additives in lubricating oils?
What is the primary function of anti-oxidant additives in lubricating oils?
What is the primary characteristic of synthetic oils?
What is the primary characteristic of synthetic oils?
What is the primary function of the viscosity of a lubricating oil?
What is the primary function of the viscosity of a lubricating oil?
What is the primary function of lubricant in a turbine circulating system?
What is the primary function of lubricant in a turbine circulating system?
What is the consequence of having a too low viscosity in air compressor cylinder oils?
What is the consequence of having a too low viscosity in air compressor cylinder oils?
What is the primary purpose of anti-oxidant additives in internal combustion engine oils?
What is the primary purpose of anti-oxidant additives in internal combustion engine oils?
What is the significance of the pour point in refrigeration compressor oils?
What is the significance of the pour point in refrigeration compressor oils?
What is the purpose of detergent dispersants in refrigeration compressor oils?
What is the purpose of detergent dispersants in refrigeration compressor oils?
What is the primary characteristic of internal combustion engine oils?
What is the primary characteristic of internal combustion engine oils?
What is the purpose of corrosion inhibitors in turbine oils?
What is the purpose of corrosion inhibitors in turbine oils?
What is the primary characteristic of air compressor cylinder oils?
What is the primary characteristic of air compressor cylinder oils?
What is the primary purpose of viscosity index improvers in refrigeration compressor oils?
What is the primary purpose of viscosity index improvers in refrigeration compressor oils?
What is the primary characteristic of gear lubricating oils used in enclosed gears?
What is the primary characteristic of gear lubricating oils used in enclosed gears?
Flashcards are hidden until you start studying
Study Notes
Friction and Surface Interaction
- Friction refers to the resistance between two surfaces in contact, opposing their relative motion.
- Microscopic analysis of smooth surfaces reveals that even flat surfaces have irregularities, affecting friction.
- Surfaces cling or weld when rubbed against each other due to the interlocking of microscopic surface irregularities.
Lubrication Functions
- Primary functions of lubrication include reducing wear and serving as a barrier to corrosion.
- Lubricants help minimize the effects of surface irregularities by filling gaps and reducing frictional contact.
- The thickening agent in semi-solid lubricants provides structure and maintains viscosity.
- Lubrication also aids in shock absorption by cushioning impacts between surfaces.
Types of Grease
- High-temperature applications benefit from using barium and lithium base greases.
- Calcium base greases are characterized by their water resistance but are unsuitable for high temperatures.
- Mixed base greases offer advantages over calcium base greases in various applications.
- Specialty greases are designed for specific high-load or extreme temperature conditions.
Viscosity and Performance
- Viscosity measures the resistance of a liquid to shear or internal deformation.
- Viscosity of oil decreases with an increase in temperature.
- Saybolt viscometer measures oil viscosity in seconds.
- The viscosity index indicates the stability of a lubricant's viscosity with temperature changes.
Additives and Stability
- Additives in lubricating oils enhance properties such as oxidation resistance, wear protection, and temperature control.
- Pour point depressants improve flow in low temperatures, while anti-oxidant additives prolong oil life in engines.
- Detergent-dispersants keep contaminants suspended, preventing sludge formation in lubricants.
Impact of Temperature
- The flash point indicates the temperature at which vapors can ignite, important for safety in lubrication applications.
- Low pour points are beneficial for maintaining lubricating properties in cold environments.
- Hydrogenation can improve the stability and performance of synthetic oils compared to mineral oils.
Characteristics of Oils and Greases
- Mineral oils are the most commonly used lubricants due to their affordability and effectiveness.
- Internal combustion engine oils have characteristics that facilitate engine performance and longevity.
- Air compressor cylinder oils require specific properties like resistance to foaming and thermal stability.
Benefits of Lubrication
- Grease lubrication is advantageous as it reduces the risk of leakage and can withstand extreme conditions better than liquid lubricants.
- Grease’s structure allows for reduced drip or splash, making it ideal for certain applications.
- Lubrication enhances the longevity of machinery by minimizing wear and creating a smoother operational environment.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
