Risk Assessment & Mitigation Flashcards
7 cards from real CLS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Risk Assessment & Mitigation flashcards as text
In lubrication risk management, what is the purpose of establishing a 'lubricant rationalization' program?
Answer: To reduce the number of lubricant types used, minimizing cross-contamination and inventory risk
Lubricant rationalization consolidates the number of products used to the minimum necessary, reducing wrong-lubricant application errors and simplifying inventory management.
What specific risk does water contamination above 0.1% (1000 ppm) pose in a circulating oil system?
Answer: Promotion of microbial growth and hydrogen embrittlement in steel components
Water above threshold levels promotes bacterial/fungal growth that produces acids and slime, and can cause hydrogen embrittlement cracking in high-strength steel components.
Which risk factor is most significantly increased when lubricating equipment operating under combined high-load and low-speed conditions?
Answer: Boundary lubrication failure due to insufficient hydrodynamic film formation
At low speeds, hydrodynamic pressure cannot build a full separating film, creating boundary lubrication conditions where EP additives and surface films must carry the load.
A maintenance team is evaluating the risk of extending oil drain intervals beyond OEM recommendations. Which analysis result would be the STRONGEST justification for the extension?
Answer: Trending oil analysis shows stable TAN, TBN, viscosity, and low wear metals at the proposed extended interval
Objective oil analysis data trending the key degradation and wear indicators provides the only defensible, equipment-specific evidence for safely extending drain intervals.
When assessing fire risk in a system that uses fire-resistant hydraulic fluids (FRHF), which fluid type offers the HIGHEST level of fire resistance?
Answer: Phosphate ester synthetics (HFDR)
Phosphate ester (HFDR) fluids are inherently fire-resistant synthetic fluids with no water content that can evaporate, offering the highest fire resistance among FRHF types.
In a risk-based maintenance framework, what does the term 'probability of failure on demand (PFD)' most directly measure in a lubrication safety context?
Answer: The likelihood that a safety-instrumented lubrication system will fail to respond when needed
PFD measures the probability that a protective system (e.g., low-lube-pressure shutdown) will fail to function when a demand (dangerous condition) actually occurs.
What risk does 'lubricant creep' or 'oil migration' pose in precision equipment, and which lubricant property most directly controls this risk?
Answer: Surface tension and spreading coefficient determine how far a lubricant migrates beyond its intended application area
Lubricant migration is governed by surface tension and spreading behavior; lubricants with low surface tension spread aggressively and can contaminate sensitive components like optics or electrical contacts.