CEM Hazard Identification & Risk Analysis 2 — Questions and Answers
Question 1: Which quantitative risk analysis technique uses probability distributions to model uncertainty across thousands of simulated scenarios?
- Fault tree analysis
- Monte Carlo simulation (Correct answer)
- HAZOP study
- Delphi method
Correct answer: Monte Carlo simulation
Monte Carlo simulation runs thousands of random trials using probability distributions to estimate the range and likelihood of risk outcomes.
Question 2: In the context of a Hazard and Operability (HAZOP) study, what does the guide word 'MORE' indicate?
- A hazard has been eliminated
- A quantitative increase in a parameter beyond design intent (Correct answer)
- A complete absence of flow or activity
- A reversal of intended direction
Correct answer: A quantitative increase in a parameter beyond design intent
The guide word 'MORE' in HAZOP signifies a quantitative increase, such as higher pressure or greater flow than the design specification allows.
Question 3: A jurisdiction experiences flooding once every 50 years on average. What is the annual probability of flooding occurring in any given year?
- 5%
- 0.5%
- 2% (Correct answer)
- 50%
Correct answer: 2%
A 50-year return period corresponds to a 1/50 = 2% annual probability of occurrence.
Question 4: Which type of hazard analysis specifically examines the sequence of events leading to an undesired top event using a logic diagram?
- Event tree analysis
- Failure mode and effects analysis
- Fault tree analysis (Correct answer)
- Bow-tie analysis
Correct answer: Fault tree analysis
Fault tree analysis uses a top-down deductive logic diagram with AND/OR gates to trace all combinations of failures that could cause a specific top event.
Question 5: In risk communication, the 'outrage' factor developed by Peter Sandman refers to:
- The technical probability of a hazard occurring
- Non-technical factors that influence public perception of risk (Correct answer)
- The economic cost of a disaster event
- The number of fatalities caused by a hazard
Correct answer: Non-technical factors that influence public perception of risk
Sandman's outrage factors are non-technical elements—such as voluntariness, fairness, and trust—that heavily shape how the public perceives and responds to risk.
Question 6: Which element is NOT typically included in a community hazard profile?
- Frequency of past hazard events
- Geographic extent of hazard impact zones
- Individual household income data (Correct answer)
- Magnitude and intensity of potential hazards
Correct answer: Individual household income data
A hazard profile documents frequency, extent, magnitude, and historical occurrence of hazards—individual household income is a vulnerability indicator, not a hazard characteristic.
Question 7: The process of estimating the number of people, property values, and critical facilities exposed to a specific hazard is called:
- Consequence analysis
- Exposure analysis (Correct answer)
- Sensitivity mapping
- Risk indexing
Correct answer: Exposure analysis
Exposure analysis quantifies what is located within the hazard zone, including population, buildings, infrastructure, and critical facilities.
CEM Hazard Identification & Risk Analysis 2
Which quantitative risk analysis technique uses probability distributions to model uncertainty across thousands of simulated scenarios?