CSS Risk & Hazard Control 2 — Questions and Answers
Question 1: Which risk assessment methodology uses a matrix to plot likelihood against consequence severity?
- Failure Mode and Effects Analysis (FMEA)
- Risk probability-severity matrix (Correct answer)
- Job Hazard Analysis (JHA)
- Root Cause Analysis (RCA)
Correct answer: Risk probability-severity matrix
A risk probability-severity matrix plots the likelihood of an event against its potential severity to prioritize hazard controls.
Question 2: The substitution method of hazard control involves:
- Adding warning signs near the hazard
- Replacing a hazardous substance or process with a less hazardous one (Correct answer)
- Isolating workers from the hazard using barriers
- Providing PPE to reduce exposure
Correct answer: Replacing a hazardous substance or process with a less hazardous one
Substitution replaces a hazardous material or process with a safer alternative, making it the second most effective control after elimination.
Question 3: A residual risk is best defined as:
- Risk that exists before any controls are applied
- Risk remaining after all feasible controls have been implemented (Correct answer)
- Risk that is acceptable without any further action
- Risk identified during an emergency response
Correct answer: Risk remaining after all feasible controls have been implemented
Residual risk is the level of risk that remains after all practicable control measures have been put in place.
Question 4: When conducting a Job Hazard Analysis (JHA), the first step is to:
- Identify all potential hazards for each task step
- Select the job to be analyzed (Correct answer)
- Determine corrective actions for each hazard
- Train employees on the identified hazards
Correct answer: Select the job to be analyzed
The first step in a JHA is selecting the job to be analyzed, typically prioritized by frequency of accidents, severity potential, or new tasks.
Question 5: Which chemical hazard control measure is considered an engineering control?
- Chemical-resistant gloves
- Safety data sheet (SDS) review
- Local exhaust ventilation (LEV) (Correct answer)
- Restricted access sign posting
Correct answer: Local exhaust ventilation (LEV)
Local exhaust ventilation is an engineering control that captures and removes airborne contaminants at the source before workers can be exposed.
Question 6: The primary purpose of a process hazard analysis (PHA) in a chemical facility is to:
- Train employees in emergency evacuation procedures
- Identify, evaluate, and control hazards associated with hazardous chemical processes (Correct answer)
- Conduct routine safety inspections of equipment
- Develop personal protective equipment requirements
Correct answer: Identify, evaluate, and control hazards associated with hazardous chemical processes
A PHA systematically identifies and evaluates potential hazards in chemical processes to prevent releases, fires, explosions, and other incidents.
Question 7: In the context of risk management, 'risk tolerance' refers to:
- The maximum injury rate an organization will accept
- The level of risk an organization is willing to accept after controls are applied (Correct answer)
- An employee's physical ability to handle dangerous work
- The time allowed before a risk must be corrected
Correct answer: The level of risk an organization is willing to accept after controls are applied
Risk tolerance defines the threshold of residual risk that an organization deems acceptable given its values, resources, and regulatory requirements.
CSS Risk & Hazard Control 2
Which risk assessment methodology uses a matrix to plot likelihood against consequence severity?