Quiz #18: Lubricant Selection and Challenges for High-Temperature Applications Team 17 Sep, 2024 High-Temperature Lubricants Quiz 1. What is the primary concern when selecting lubricants for high-temperature applications? A) Low viscosity index B) Thermal stability and oxidation resistance C) Low pour point D) High biodegradability 2. Which base oil is preferred for high-temperature environments? A) Mineral oil B) PAO synthetic oil C) Water-based lubricant D) Grease 3. What is a common problem faced by lubricants at high temperatures? A) Increased volatility and evaporation loss B) Improved viscosity stability C) Better water resistance D) Enhanced pour point 4. Which additive is often included in high-temperature lubricants to enhance thermal stability? A) Anti-foam agents B) Extreme pressure additives C) Antioxidants D) Detergents 5. What property is most important for greases used in high-temperature applications? A) High water content B) High dropping point C) Low base oil viscosity D) High acidity 6. What type of grease thickener is best for high-temperature conditions? A) Sodium B) Lithium complex C) Polyurea D) Calcium 7. What is one potential issue with using mineral oils in high-temperature applications? A) High flash point B) Quick oxidation and sludge formation C) Excellent biodegradability D) High viscosity index 8. Why is it important to use a lubricant with a high flash point in high-temperature applications? A) To reduce wear B) To prevent the lubricant from catching fire C) To improve water resistance D) To increase cost-efficiency 9. What is the role of molybdenum disulfide in high-temperature greases? A) Enhance color B) Act as a thickening agent C) Provide solid lubrication for extreme temperatures D) Increase the dropping point 10. What happens if a lubricant's operating temperature exceeds its recommended limit? A) Improved performance B) Accelerated degradation and potential equipment failure C) Reduced friction D) Lower viscosity Submit
