CRE Risk Assessment and Mitigation 3

Question 1

In Bow-Tie analysis, the 'top event' represents:

Accepted Answer

The hazardous event at the center connecting threats and consequences

Answer

The top event in a Bow-Tie diagram is the central hazardous event that separates threat-side barriers from consequence-side barriers.

Question 2

Which technique is most appropriate for identifying common-cause failures that can defeat redundant systems?

Accepted Answer

Common Cause Failure (CCF) analysis

Answer

CCF analysis specifically examines shared dependencies and environmental factors that can simultaneously affect multiple redundant components.

Question 3

The beta factor model in common-cause failure analysis represents:

Accepted Answer

The fraction of total failure rate attributed to common-cause events

Answer

The beta factor (β) is the proportion of component failures that are common-cause failures relative to the total failure rate.

Question 4

Which risk assessment output is most useful for prioritizing corrective actions in a resource-constrained environment?

Accepted Answer

Risk Priority Number (RPN) ranking

Answer

RPN = Severity × Occurrence × Detection provides a ranked list that helps teams prioritize corrective actions when resources are limited.

Question 5

Residual risk is best defined as:

Accepted Answer

Risk that remains after all planned mitigation measures are implemented

Answer

Residual risk is the level of risk that persists after controls and mitigations have been applied, which must then be evaluated for acceptability.

(CRE) Certified Reliability Engineer Practice Test