Predictive & Preventive Maintenance Flashcards
7 cards from real MMC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Predictive & Preventive Maintenance flashcards as text
Which oil analysis parameter is most useful for detecting bearing wear in rotating equipment?
Answer: Ferrographic particle count
Ferrographic particle count identifies ferrous wear particles shed by bearings, providing early warning of mechanical degradation.
A PM task requiring lubrication every 500 operating hours is best triggered by which method?
Answer: Equipment runtime meter
An equipment runtime meter directly tracks actual operating hours, ensuring lubrication is performed at the correct interval regardless of calendar time.
What does a rising trend in ultrasonic decibel readings from a steam trap most likely indicate?
Answer: Trap is blowing live steam (failed open)
A steam trap failed open passes live steam continuously, generating elevated high-frequency ultrasonic noise detectable with an ultrasonic instrument.
In a preventive maintenance program, 'task bundling' refers to:
Answer: Grouping multiple PM tasks on the same equipment during a single shutdown
Task bundling reduces total downtime by performing several PM activities on one piece of equipment during a single planned outage.
Which condition monitoring technique measures changes in the physical properties of lubricating oil without sending samples to a lab?
Answer: In-line oil quality sensor
In-line oil quality sensors measure real-time parameters such as dielectric constant, moisture, and viscosity directly in the lubrication system.
The primary purpose of establishing P-F intervals in predictive maintenance is to:
Answer: Define the window between potential failure detection and functional failure
The P-F interval is the time between when a potential failure becomes detectable (P) and when functional failure occurs (F), defining how much lead time maintenance has.
Which type of preventive maintenance task is considered 'on-condition' rather than time-based?
Answer: Inspecting belt tension and replacing only if out of tolerance
On-condition tasks defer replacement until an inspection reveals the item has reached a defined threshold, rather than replacing at a fixed interval.