Preventative Maintenance & Equipment Calibration 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 Preventative Maintenance & Equipment Calibration flashcards as text
Trending vibration readings on a pump bearing to schedule replacement before failure is an example of which maintenance strategy?
Answer: Predictive maintenance
Predictive maintenance uses condition monitoring data such as vibration to time repairs before failure.
In the United States, calibration standards should be traceable to which organization?
Answer: NIST
The National Institute of Standards and Technology maintains the national measurement standards that US calibrations trace back to.
An instrument's as-found readings have been out of tolerance at its last three calibrations. What is the best action?
Answer: Shorten the calibration interval
Repeated as-found failures show the instrument drifts faster than the current interval allows, so the interval should be shortened.
What minimum test accuracy ratio between the reference standard and the unit under test is commonly recommended?
Answer: 4:1
A 4:1 ratio means the standard is at least four times more accurate than the device being calibrated.
What is a common result of over-greasing a sealed or shielded electric motor bearing?
Answer: Increased bearing temperature and seal damage
Excess grease causes churning and friction that raises bearing temperature and can blow out seals.
During PM, infrared thermography is most often used to detect what problem?
Answer: Loose or high-resistance electrical connections
High-resistance electrical connections produce heat that appears as hot spots on a thermal image.
What does MTBF stand for in maintenance reliability metrics?
Answer: Mean Time Between Failures
MTBF is the average operating time between failures of repairable equipment.