Machinery Lubrication

Machinery Lubrication May June 2013

Machinery Lubrication magazine published by Noria Corporation

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Page 25 of 59

ML 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 1. Abrasive wear occurs where? A) Pistons/cylinders B) Cams C) Rolling-element bearings D) Gears E) All of the above 2. Sampling non-circulating, splash/bath machine sumps is best done by: A) Drain plug removal B) Using a flexible, drop-tube, vacuum sample C) Using a flexible, drop-tube, vacuum sample from the bottom of the sump D) Obtaining a mid oil level sample from a fixed rigid tube within the sump E) These systems should not be sampled 3. Visually checking the color of a used oil sample can indicate: A) Oxidation B) Soot C) Water contamination D) A change in base number E) Answers A, B and C 3. E Visual inspection can indicate oxidation, as oxidized oils tend to be darker. Soot is a heavy, black substance usually seen at the bottom of a sample bottle. Water contamination also can be easily observed as free water in the bottom of the bottle if the concentration is high. Other oils tend to emulsify, producing a milky appearance. 2. D The best method is to install a sampling valve equipped with a rigid stainless-steel tube. The tube should be manipulated to be close to the zone of fluid movement (mid oil level). A minimum clearance of 2 inches from any dynamic or static surface should be maintained. 1. E Abrasive wear normally occurs in sliding contact applications. However, it is not limited to just pure sliding contact. It is seen in all applications where abrasive particles get between mating surfaces. This includes pistons, cylinders, cams, rolling-element bearings, gears, etc. Answers: 24 | May - June 2013 |

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