Quiz #09: Lubricating Grease Selection Team 5 Sep, 2024 Grease Application Quiz 1. Which property of grease is most critical for applications involving high loads and slow speeds? A) Low viscosity B) High base oil viscosity C) Low dropping point D) High oxidation stability 2. What is the significance of a grease’s worked penetration value? A) It indicates the water resistance of the grease B) It measures the stiffness or consistency of the grease C) It determines the dropping point D) It shows the grease’s oxidation stability 3. Which type of grease is most suitable for electric motor bearings? A) Bentonite clay grease B) Lithium complex grease C) Sodium-based grease D) Graphite grease 4. What is the primary role of thickeners in grease? A) To reduce friction B) To provide the base lubricating properties C) To act as a carrier for base oil and additives D) To increase the dropping point 5. Why is it important to consider the base oil viscosity in grease selection? A) It determines the grease’s color B) It affects the flow properties at operating temperatures C) It increases the thickener's efficiency D) It reduces the risk of corrosion 6. Which additive is commonly used in greases to improve extreme pressure (EP) performance? A) Calcium sulfonate B) Polyalphaolefin C) Zinc dialkyldithiophosphate (ZDDP) D) Bentonite 7. What does the term "shear stability" refer to in the context of grease? A) The ability to resist changes in consistency due to mechanical stress B) The resistance to oxidation at high temperatures C) The ability to resist water washout D) The compatibility with seals 8. Which factor is most likely to cause grease bleeding in an application? A) High ambient temperatures B) Low oil separation rate C) High NLGI grade D) Use of synthetic thickeners 9. For a food-grade application, which type of grease is most suitable? A) Lithium soap grease B) Polyurea grease C) H1-rated synthetic grease D) Sodium soap grease 10. What is the most likely consequence of using a grease with a dropping point too close to the operating temperature? A) Improved lubrication performance B) Grease hardening C) Grease leakage and potential bearing failure D) Extended lubrication intervals Submit
