Machinery Lubrication

Machinery Lubrication March April 2017

Machinery Lubrication magazine published by Noria Corporation

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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 TEST YOUR KNOWLEDGE Answers 1. C The ISO solid contaminant code is useful in characterizing the concentration of solid particles in a lubricant. The current ISO solid contamination code provides particle counts for particles larger than 4, 6 and 14 microns. 2. E Additives are added to base oil to enhance existing properties (examples include anti- oxidants, corrosion inhibitors, anti-foam and demulsifying agents); suppress existing undesirable properties (pour point depressants and viscosity index improvers are good examples); and add new properties (examples would be extreme-pressure and anti-wear additives, detergents and metal deactivators). 3. C A centistoke, which is the unit of kinematic viscosity, is equal to mm 2 /second. Kine- matic viscosity is dynamic viscosity (centipoise) divided by the specific gravity of the fluid. SUS stands for Saybolt Universal Seconds, which is another unit to measure viscosity. The SUS viscosity measurement method has largely been replaced by the kinematic viscosity method. 1. The ISO solid contaminant code: A) Is a means to characterize the chemical composition of debris found in the lubricant B) Is useful as a means to accurately state the concentration of dirt in a lubricant C) Is useful as a means to characterize the concentration of solid particles in a lubricant D) Is the most useful condition-based measure to gauge oil life E) Is a means of characterizing the type of solid contaminant 2. Additives: A) Enhance existing base oil properties B) Suppress undesirable base oil properties C) Add new properties that the base oil cannot provide D) Answers A and B only E) Answers A, B and C 3. Which two viscosity units are identical: centistokes, centi- poise, SUS and mm 2 /second? A) Centistokes and centipoise B) Centistokes and SUS C) Centistokes and mm 2 /second D) Centipoise and mm 2 /second E) Centipoise and SUS Stay Connected With Noria Follow us on Twitter Like us on Facebook Connect with us on LinkedIn /noria-corporation Continue learning with us on YouTube | March - April 2017 | 41

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