Machinery Lubrication

Machinery Lubrication Mar Apr 2013

Machinery Lubrication magazine published by Noria Corporation

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Page 33 of 82

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. What percentage by volume of SAE 10W-30 is SAE 30? A) 0% B) 25% C) 50% D) 75% E) 100% 2. Magnetic plug inspections: A) Crudely indicate presence of iron wear B) Indicate water contamination C) Indicate copper wear rates D) Indicate oil circulation rates E) Indicate corrosion is occurring 3. A filter's differential pressure slowly increases over time. What's wrong? A) The filter has burst B) The filter bypass valve is open C) ISO particle counts should be taken D) Filter differential pressure does not increase E) Nothing, it's removing dirt 3. E This is an indication that the filter is functioning properly. On the other hand, if the oil is contaminated and the differential pressure is continuously low, this indicates the filter is not functioning (perhaps in bypass). 2. A Magnetic plug inspections can indicate the presence of ferrous wear (iron and steel). The magnetic plug will hold ferrous wear particles but not other particles. 1. A SAE 10W-30 and SAE 30 are totally different oils. SAE 10W-30 is a multi-grade oil in which a viscosity-index improver has been added so the oil can be utilized over a wide range of temperatures. SAE 10W-30 oil works as SAE 10 at cold temperatures and as SAE 30 at high temperatures. Answers: 32 | March - April 2013 |

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