Machinery Lubrication

Machinery Lubrication March April 2014

Machinery Lubrication magazine published by Noria Corporation

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36 | March - April 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. Surface fatigue can be described as: A) Adhesion B) Pitting caused by surface corrosion C) Metal fracturing due to chemical damage D) Surface-initiated pit formation caused by cyclic loading E) Plastic deformation of the metal's surface 2. Oxidation stability is not detectable and not monitored with: A) Acid number B) Karl Fischer C) RPVOT D) Fourier transform infrared (FTIR) spectroscopy E) Voltammetry 3. Sampling a wet sump gearbox with a small oil circulation system should be done where? A) Downstream of the pump, upstream of the main pressure-line filter B) Downstream of the sump, upstream of the pump (before the pump) C) Downstream of the main pressure- line filter D) From the sump E) From the gearbox drain plug Answers: 1. D Other names for surface fatigue include contact fatigue, spalling, pitting, etc. It is associated with components such as anti-friction bearings, gear teeth at the pitchline, cams and rollers. Surface fatigue usually begins with denting due to the presence of particles. The dent forms a stress riser. Repeated cyclic loading causes surface fatigue, which eventually results in pits and then large spalls. 2. B The Karl Fischer test is used to quantify water content and is not used to detect or monitor oxidation. The other listed tests are used to detect or measure oxidation stability of oil. 3. A This is to assess the actual condition of the oil before it gets filtered. test your knOwledge

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