COSS Safety Skills 2 — Questions and Answers
Question 1: When conducting a Job Hazard Analysis (JHA), which step comes FIRST?
- Select the job to be analyzed (Correct answer)
- Identify hazards associated with each step
- Break the job down into successive steps
- Determine preventive measures
Correct answer: Select the job to be analyzed
The first step in a JHA is selecting the job to be analyzed, typically prioritizing jobs with high injury rates or severe potential consequences.
Question 2: A worker is exposed to a noise level of 95 dBA for 4 hours per day. According to OSHA's permissible exposure limits, this situation:
- Exceeds the PEL and requires immediate controls (Correct answer)
- Is within the PEL since only 4 hours of exposure occurred
- Requires only hearing protection with no engineering controls needed
- Is below the action level and requires no action
Correct answer: Exceeds the PEL and requires immediate controls
OSHA's PEL for 95 dBA is 4 hours, so 4 hours of exposure at 95 dBA exactly meets but does not exceed the PEL; however, if combined with other noise sources, it could exceed it.
Question 3: Which hierarchy of controls option is considered most effective for eliminating workplace hazards?
- Administrative controls
- Personal protective equipment
- Engineering controls
- Elimination (Correct answer)
Correct answer: Elimination
Elimination physically removes the hazard from the workplace and is the most effective control method in the hierarchy.
Question 4: Under OSHA's Lockout/Tagout standard (29 CFR 1910.147), an 'authorized employee' is defined as one who:
- Has completed general safety orientation
- Locks out or tags out machines to perform servicing (Correct answer)
- Operates equipment in normal production mode
- Supervises others performing lockout procedures
Correct answer: Locks out or tags out machines to perform servicing
An authorized employee is specifically the person who locks out or tags out the machine or equipment to perform service or maintenance.
Question 5: What does the term 'residual risk' mean in safety management?
- Risk that remains after all feasible controls have been implemented (Correct answer)
- Risk identified but not yet assessed
- The total risk before any controls are applied
- Risk transferred to an insurance carrier
Correct answer: Risk that remains after all feasible controls have been implemented
Residual risk is the risk that remains after all practicable hazard controls have been implemented and is accepted by management.
Question 6: A safety professional discovers that a confined space contains an oxygen concentration of 19.0%. This atmosphere is classified as:
- Oxygen enriched and immediately dangerous
- Within the normal acceptable range
- Oxygen deficient and potentially hazardous (Correct answer)
- Safe but requiring continuous monitoring only
Correct answer: Oxygen deficient and potentially hazardous
OSHA defines an oxygen-deficient atmosphere as one with less than 19.5% oxygen by volume, making 19.0% oxygen deficient.
Question 7: Which type of fire extinguisher is specifically appropriate for use on energized electrical equipment fires (Class C)?
- Water extinguisher
- CO2 or dry chemical extinguisher (Correct answer)
- Class K wet chemical extinguisher
- Class A foam extinguisher
Correct answer: CO2 or dry chemical extinguisher
CO2 and dry chemical extinguishers are rated for Class C fires because they are non-conductive and will not cause electrical shock.
COSS Safety Skills 2
When conducting a Job Hazard Analysis (JHA), which step comes FIRST?