CLS Quality Control & Process Improvement 2 — Questions and Answers
Question 1: A lubrication technician notices that oil analysis results for a gearbox show a sudden spike in iron particle count. Which corrective action should be prioritized first?
- Change the lubricant immediately without further investigation
- Increase the oil change frequency as a preventive measure
- Perform a follow-up sample to confirm the trend before escalating (Correct answer)
- Shut down the equipment and replace all bearings
Correct answer: Perform a follow-up sample to confirm the trend before escalating
A follow-up sample confirms whether the spike is a real trend or a sampling anomaly before costly actions are taken.
Question 2: In a Kaizen event focused on lubrication routes, which metric best measures the success of the improvement?
- Total volume of lubricant consumed per month
- Reduction in lubrication-related downtime and route completion time (Correct answer)
- Number of lubrication points added to the route
- Cost of lubricants purchased in the quarter
Correct answer: Reduction in lubrication-related downtime and route completion time
Kaizen success in lubrication is measured by tangible gains such as reduced downtime and more efficient route execution.
Question 3: Which statistical tool is most appropriate for identifying the root cause of lubricant contamination events occurring at different frequencies across multiple machines?
- Pareto chart (Correct answer)
- Gantt chart
- Control chart
- Scatter diagram
Correct answer: Pareto chart
A Pareto chart ranks contamination sources by frequency, helping prioritize the most impactful corrective actions.
Question 4: A facility wants to standardize lubricant storage to reduce cross-contamination risk. Which color-coding system element is most critical?
- Using different container sizes for different lubricant grades
- Assigning a unique color to each lubricant type and applying it consistently to all dispensing equipment (Correct answer)
- Labeling only the primary storage drums
- Storing all lubricants in the same room to simplify access
Correct answer: Assigning a unique color to each lubricant type and applying it consistently to all dispensing equipment
Consistent color coding applied to all dispensing tools, containers, and fittings prevents accidental mixing of lubricants.
Question 5: Which approach best supports a continuous improvement culture in a lubrication program?
- Relying solely on OEM recommendations without modification
- Conducting annual audits only when equipment failures occur
- Using a PDCA (Plan-Do-Check-Act) cycle for routine lubrication tasks (Correct answer)
- Delegating all improvement decisions to equipment manufacturers
Correct answer: Using a PDCA (Plan-Do-Check-Act) cycle for routine lubrication tasks
PDCA provides a structured iterative framework that embeds continuous improvement directly into daily lubrication practices.
Question 6: During an oil analysis review, a hydraulic fluid sample shows a viscosity 15% below specification. What is the most likely cause?
- Overgreasing of adjacent components
- Fuel dilution or solvent contamination (Correct answer)
- High particulate loading from wear debris
- Oxidation of the base oil
Correct answer: Fuel dilution or solvent contamination
Fuel or solvent dilution lowers viscosity significantly by thinning the base oil, making it a primary suspect when viscosity drops below spec.
Question 7: A facility implements ISO 16232 cleanliness standards for hydraulic systems. What does achieving a target cleanliness code primarily prevent?
- Lubricant evaporation during storage
- Abrasive wear and valve malfunction caused by solid particle contamination (Correct answer)
- Rust formation on external machine surfaces
- Thermal breakdown of the lubricant additive package
Correct answer: Abrasive wear and valve malfunction caused by solid particle contamination
ISO cleanliness codes target solid particle contamination, which is the leading cause of abrasive wear and hydraulic component failures.
CLS Quality Control & Process Improvement 2
A lubrication technician notices that oil analysis results for a gearbox show a sudden spike in iron particle count.
Which corrective action should be prioritized first?