Machinery Lubrication

Machinery Lubrication May-June 2019

Machinery Lubrication magazine published by Noria Corporation

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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 42 | May - June 2019 | www . 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. 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. 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 fl uid movement (mid oil level). A minimum clearance of 2 inches from any dynamic or static surface should be maintained. 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 contam- ination 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. 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 fl exible, drop-tube, vacuum sample C) Using a fl exible, drop-tube, vacuum sample from the bottom of the sump D) Obtaining a mid oil level sample from a fi xed rigid tube within the sump E) ese 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

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