Millwright Predictive and Preventive Maintenance Flashcards
6 cards from real Millwright Certification practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Millwright Predictive and Preventive Maintenance flashcards as text
Which statement best describes the primary difference between Preventive Maintenance (PM) and Predictive Maintenance (PdM)?
Answer: PM is based on a fixed schedule, while PdM is based on the actual condition of the equipment.
Preventive Maintenance involves performing tasks at predetermined intervals (time or cycles) to reduce the likelihood of failure. Predictive Maintenance uses condition-monitoring tools to assess equipment condition in real-time and perform maintenance only when needed.
Vibration analysis is most effective for detecting which of the following mechanical faults in rotating equipment?
Answer: Imbalance, misalignment, and bearing defects
Vibration analysis measures the frequency and amplitude of machine vibrations. Each common mechanical fault, such as imbalance, misalignment, looseness, or bearing wear, generates a unique and identifiable vibration signature.
An infrared thermography inspection of an electrical cabinet reveals a connection point that is significantly hotter than similar connections under the same load. This most likely indicates:
Answer: High resistance due to a loose or corroded connection
According to the formula P = I²R, heat generated at a connection is proportional to its resistance. A loose or corroded connection increases resistance (R), causing it to heat up under normal current (I) flow, which is easily detected by an infrared camera.
Which of the following is a classic example of a Preventive Maintenance (PM) task?
Answer: Changing the oil in a gearbox every 2,000 operating hours
This is a time-based task performed regardless of the oil's actual condition, which is the defining characteristic of preventive maintenance. The other options are examples of predictive or condition-based maintenance.
What is the primary goal of Root Cause Failure Analysis (RCFA)?
Answer: To identify and correct the underlying systemic reasons for a failure to prevent recurrence
RCFA is a problem-solving method that aims to go beyond the immediate cause of a failure to find the fundamental, or 'root,' causes. Correcting the root cause is the only way to prevent the problem from happening again.
In maintenance terminology, what does the acronym MTBF stand for?
Answer: Mean Time Between Failures
Mean Time Between Failures (MTBF) is a key performance indicator for reliability. It represents the average time that a piece of equipment operates between one failure and the next, and a higher MTBF indicates greater reliability.