Maintenance and Reliability Flashcards
7 cards from real CPM practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Maintenance and Reliability flashcards as text
The 'P-F interval' in predictive maintenance refers to:
Answer: The time between a potential failure signal and functional failure
The P-F interval is the time between the point where a potential failure becomes detectable (P) and when it becomes a functional failure (F), defining the window for intervention.
Which maintenance key performance indicator (KPI) directly measures the percentage of total maintenance time spent on unplanned repairs?
Answer: Reactive maintenance ratio
The reactive maintenance ratio tracks the proportion of maintenance hours spent on unplanned, emergency repairs versus total maintenance hours.
In a Failure Mode and Effects Analysis (FMEA), the Risk Priority Number (RPN) is calculated as:
Answer: Severity × Occurrence × Detection
RPN = Severity × Occurrence × Detection, where each factor is rated on a scale (typically 1–10) to prioritize failure modes for corrective action.
A plant uses thermographic infrared scanning during operation to detect hot spots in electrical panels. This is an example of:
Answer: Condition-based monitoring
Infrared thermography is a condition monitoring technique that detects thermal anomalies indicating developing faults without requiring equipment shutdown.
Which term describes the probability that a system will perform its required function for a specified period under stated conditions?
Answer: Reliability
Reliability is specifically defined as the probability of a system performing its intended function without failure over a given time under defined conditions.
A plant's computerized maintenance management system (CMMS) is BEST used to:
Answer: Track work orders, asset history, and spare parts inventory
A CMMS is fundamentally a database and workflow tool that manages work orders, asset records, maintenance history, and inventory rather than replacing engineering judgment.
When performing a criticality analysis, assets are ranked based on:
Answer: Consequence of failure and probability of failure
Criticality analysis ranks assets by combining the consequence of failure (safety, production, cost impact) with the likelihood of failure to prioritize maintenance resources.