Certified Maintenance & Reliability Professional (CMRP) Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

Prepare for the Certified Maintenance and Reliability Professional Exam with challenging questions and comprehensive answers. Sharpen your skills in maintenance best practices, reliability engineering, and management to ensure success!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

Which sample represents cleaner oil: 16/14/11 or 22/21/17?

16/14/11
22/21/17
Both are equally clean
Neither is clean

The correct answer is: 16/14/11

The correct answer is based on the ISO cleanliness standards for oil, which utilize a three-number code to indicate the levels of particles present in the oil. Each of the three numbers corresponds to a specific range of particle counts measured in sizes: over 4 microns, over 6 microns, and over 14 microns. For the sample marked 16/14/11, the first number (16) indicates the count of particles larger than 4 microns, the second number (14) is for particles larger than 6 microns, and the last number (11) refers to particles larger than 14 microns. The lower these numbers, the cleaner the oil is considered to be. In comparison, the sample marked 22/21/17 has higher values across all particle size ranges which indicates a greater number of particles present in the oil. This suggests that this sample is significantly more contaminated than the other one. Thus, the sample 16/14/11 represents cleaner oil because it has lower particle counts in each measured size category, making it more suitable for machinery requiring clean oil for optimal operation and reliability.