Machinery Lubrication

Machinery Lubrication November-December 2017

Machinery Lubrication magazine published by Noria Corporation

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42 | November - December 2017 | www . 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 TEST YOUR KNOWLEDGE This month, Machiner y Lubrication continues it s " Test Your Knowledge" sec tion in which we focus on a group of questions from Noria's Prac tice 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 prac tice test with expanded answers is available at ANSWERS 1. C Anti-wear and extreme-pressure additives react with a component's surface due to high frictional heat from a low shear-strength film that protects against adhesive and abrasive wear. Therefore, the correct answer is C. 2. B These two methods help control (reduce) the pressure to safely collect samples. 3. C Viscosity upper and lower alarm limits are needed to ensure that lubricated compo- nents run on the correct oil film. Viscosity that is higher than the system requirements leads to churning as well as high temperature and its associated problems. On the other hand, a lower viscosity may not be able to carry the load, which causes wear and in some cases component failure. For acid number (AN), the upper limit is normally monitored by comparing it to the AN value of new oil. For the base number, flash point and RPVOT, lower limits are generally monitored by comparing them to the values of new (reference) oil. 1. Anti-wear and extreme-pressure additives function by: A) Reacting within the bulk oil to form wear protecting chemicals. B) Are used in the same oil formulations. C) Reacting with the iron surface due to frictional heat to reduce surface damage. D) Stopping the wear reaction pathway. E) Altering the surface tension of the oil. 2. Which hardware is the best for sampling pressurized lines above 500 psi? A) A long dead-leg of piping with a plug at the end B) A pressure-regulating valve or a helical coil connected to a minimess valve C) A capped drain plug D) A minimess valve located on an elbow E) A minimess valve located on a straight length of pipe 3. Upper and lower alarm limits are generally needed on which oil analysis test results? A) Acid number B) Base number C) Viscosity D) Flash point E) RPVOT

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