CMRT Equipment Reliability 3

Question 1

In a Failure Mode and Effects Analysis (FMEA), the Risk Priority Number (RPN) is calculated by multiplying which three factors?

Accepted Answer

Severity, Occurrence, Detection

Answer

RPN = Severity × Occurrence × Detection, and higher RPN values indicate higher priority failure modes for corrective action.

Question 2

Which root cause analysis technique uses a diagram resembling a fish skeleton to organize potential causes of a failure?

Accepted Answer

Ishikawa diagram

Answer

The Ishikawa (fishbone) diagram organizes potential causes into major categories branching from the effect, resembling a fish skeleton.

Question 3

A bearing fails prematurely showing spalling on one race. What failure mechanism is most likely responsible?

Accepted Answer

Fatigue

Answer

Spalling (surface pitting and material breakaway) on bearing races is a classic sign of rolling contact fatigue.

Question 4

Which failure analysis method uses Boolean logic to evaluate combinations of component failures that lead to a top-level system failure?

Accepted Answer

Fault Tree Analysis

Answer

Fault Tree Analysis uses AND/OR logic gates to graphically map how combinations of lower-level failures cause a specific top-level undesired event.

Question 5

When performing a '5-Why' analysis on a gearbox failure, the primary purpose is to:

Accepted Answer

Identify the physical, human, and latent root causes

Answer

The 5-Why method drills down through successive 'why' questions to uncover physical, human, and latent systemic root causes.

(CMRT) Certified Maintenance and Reliability Technician Practice Test