CMRT Preventive and Predictive Maintenance Questions and Answers

Question 1

A technician uses infrared thermography to inspect an electric motor and identifies a bearing housing with a significantly higher temperature than identical motors operating under similar loads.
This is an early indicator of a potential failure.
Which maintenance concept does this scenario best illustrate?

Accepted Answer

Predictive Maintenance (PdM)

Answer

Reactive Maintenance

Answer

Preventive Maintenance

Answer

Corrective Maintenance

Question 2

On the P-F Curve, what does the 'P-F Interval' represent?

Accepted Answer

The time from when a potential failure is first detectable to when a functional failure occurs.

Answer

The total operational life of the asset.

Answer

The time between a scheduled preventive maintenance task and the asset's failure.

Answer

The period required to perform a full functional check on the equipment.

Question 3

A maintenance team is implementing a predictive maintenance program for a critical gearbox. Which of the following techniques would be most effective for detecting wear particles from gears and bearings, as well as assessing the health of the lubricant itself?

Accepted Answer

Oil Analysis

Answer

Vibration Analysis

Answer

Ultrasonic Testing

Answer

Motor Circuit Analysis

Question 4

A technician is using an ultrasonic detector in a plant with high levels of audible background noise. Which of the following issues is this technology exceptionally good at identifying in this environment?

Accepted Answer

Compressed air system leaks

Answer

Structural cracks in building foundations

Answer

Overheating in an electrical panel

Answer

Misalignment in a pump coupling

Question 5

Which of the following describes a primary difference between Preventive Maintenance (PM) and Predictive Maintenance (PdM)?

Accepted Answer

PM schedules tasks based on time or usage intervals, while PdM schedules tasks based on equipment condition.

Answer

PM is proactive, while PdM is reactive.

Answer

PM requires advanced diagnostic tools, while PdM relies only on technician senses.

Answer

PM is only performed after a failure has occurred, while PdM is performed before.

Question 6

A vibration analyst is reviewing data from a routine survey of a centrifugal pump. The spectral data shows a distinct peak at one times (1x) the running speed of the pump. This is most often an early indication of what type of fault?

Accepted Answer

Imbalance

Answer

Bearing outer race defect

Answer

Gear mesh wear

Answer

Looseness