MACHINERY LUBRICATION- INDIA SEPTEMBER-OCTOBER 2019 | Page 40

TEST YOUR KNOWLEDGE This month, Machinery Lubrication continues its “Test Your Knowledge” section in which we focus on a group of questions from Noria’s Practice Exam for Level I Machine Lubrication Technician and Machine Lubricant Analyst. The answers are located at the bottom of this page. The complete 126-question practice test with expanded answers is available at store.noria.com. FREE LISTING 1. Kinematic viscosity is commonly: A) Measured at 40 degrees C B) Measured at 100 degrees C C) Determined using a glass capillary tube and gravity D) Stated in centistokes at 40 degrees C E) All of the above 2. A Beta(3)=200 filter: India's only publication on lubricants, lubrication & reliability A) Only removes 3-micron particles B) Only removes particles less than 3 microns Buyer's Guide C) Only removes particles greater than 3 microns D) Removes some particles less than 3 microns We are introducing a section called 'Buyer's guide' – A comprehensive E) Removes particles between 3 and 200 microns directory of companies who offer products and services within the 3. Oxidation inhibitors: machinery lubrication, reliability A) Help to prevent the formation of acids maintenance, and oil analysis B) Help to prevent viscosity increase industries. C) Are sacrificial and get used up D) Answers A and B E) Answers A, B and C 3. E An oxidation reaction results from the sequential addition of oxygen to the base oil molecules to form different chemical species including acids. The presence of oxidation inhibitors helps protect the base oil from oxidation, thus preventing the formation of organic acids. Oxidation byproducts normally combine to form larger molecular species, which leads to polymerization. Because viscosity is directly related to the size of the molecules, any degree of polymerization results in an increase in viscosity. Oxida- tion inhibitors are sacrificial like many other additives, which requires close monitoring. Thus, the correct answer is “E.” 1. E Kinematic viscosity is measured in the lab using a glass capillary tube and gravity at both 40 and 100 degrees C. It is also stated in centistokes at 40 degrees C, so the correct answer is “E.” 2. D The number of particles greater than 3 microns upstream divided by the number of particles greater than 3 microns downstream equals 200. However, this doesn’t mean all particles less than 3 microns will pass through the filter. ANSWERS 38 | September - October 2019 | www.machinerylubricationindia.com Contact Today [email protected]