Machinery Lubrication

Machinery Lubrication Jan Feb 2014

Machinery Lubrication magazine published by Noria Corporation

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38 | January - February 2014 | ML 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 1. Which statement is incorrect regarding filter patch tests for solid contaminants? A) Patch tests use very fine micron filters B) The patch test is a form of automatic particle counting C) Patch tests can be done in-house or in a lab D) Patch discoloration can estimate overall particle concentration E) The resulting patch can be viewed or weighed to assess the contaminant concentration 2. Which of the following is the single most important property of a lubricant? A) Viscosity B) Dropping point C) Worked separation D) Base oil type E) Acid number 3. Drop-tube vacuum sampling of reservoirs and tanks is best done: A) Off the bottom of the tank B) Where the oil return line dumps back into the tank C) Where the oil suction line pulls oil from the tank D) From the top layer of the oil in the tank where water and dirt have settled out E) From the middle of the tank Answers: 1. B The filter patch test is a simple test used to evaluate solid particles where the oil passes through a fine filter. All listed choices are correct except "B," as there is no automatic particle counting involved in this simple test. 2. A Viscosity is the most important property of a lubricant. While other properties are significant, the wrong viscosity selection may lead to serious problems in a short amount of time, including metal-to-metal contact if the viscosity is too low or high temperature and its associated problems if the viscosity is too high. 3. B This will help detect wear metals generated from system frictional zones before the oil becomes diluted in the tank. tEst your KnowlEdgE 38 | January - February 2014 |

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