Equipment Reliability Flashcards
7 cards from real CMRT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Equipment Reliability flashcards as text
Reliability-Centered Maintenance (RCM) selects maintenance tasks based primarily on which criterion?
Answer: Consequences of the failure mode
RCM selects maintenance tasks based on the consequences of failure modes — safety, environmental, operational, and economic — to preserve system function.
A Weibull shape parameter (β) of less than 1.0 indicates which type of failure pattern?
Answer: Infant mortality with decreasing failure rate
A Weibull β 1 indicates increasing failure rate (wear-out).
Which maintenance strategy should be applied to a failure mode with hidden function, low severity, and no time-based wear-out pattern?
Answer: Failure-finding task (scheduled inspection)
Failure-finding tasks are scheduled to detect hidden failures before they combine with another failure to cause a hazardous or operationally significant event.
In the context of equipment reliability, 'P-F interval' refers to:
Answer: The interval between the point of potential failure detection and functional failure
The P-F interval is the time from when a potential failure (P) can first be detected to when it degrades into a functional failure (F), defining the window for condition monitoring.
Which reliability improvement technique involves redesigning a system so that a single component failure cannot cause total system loss of function?
Answer: Redundancy
Redundancy adds backup components or subsystems so that the system continues operating even when one element fails.
Equipment criticality ranking is used in maintenance planning to:
Answer: Prioritize maintenance resources toward assets with the greatest risk impact
Criticality ranking scores equipment based on failure consequence and probability, enabling maintenance teams to focus resources where failure impact is greatest.
A plant switches a centrifugal pump from scheduled time-based overhauls every 6 months to vibration-based monitoring with overhaul only when needed. This change represents a shift from:
Answer: Preventive to predictive maintenance
Condition-based (predictive) maintenance uses real-time equipment health data to schedule interventions, replacing fixed-interval preventive overhauls.