CMSP CMSP Occupational Health & Industrial Hygiene 3 — Questions and Answers
Question 1: Whole-body vibration (WBV) in mining is primarily associated with which type of equipment operation?
- Stationary drilling machines
- Haulage vehicles, scoops, and load-haul-dump (LHD) units (Correct answer)
- Fixed conveyor belts
- Electric cable reels
Correct answer: Haulage vehicles, scoops, and load-haul-dump (LHD) units
Operators of mobile haulage and LHD equipment experience significant WBV transmitted through the seat, which over time can cause musculoskeletal disorders.
Question 2: Under MSHA's mandatory medical surveillance requirements for dust-exposed miners, chest X-ray examinations must be offered:
- Once at hire and never again
- Initially and at periodic intervals based on years of dust exposure (Correct answer)
- Only after a diagnosed lung disease
- Every year regardless of exposure duration
Correct answer: Initially and at periodic intervals based on years of dust exposure
MSHA requires chest X-rays at specified intervals tied to the miner's duration of exposure to coal dust to enable early detection of pneumoconiosis.
Question 3: What is the IDLH (Immediately Dangerous to Life or Health) concentration for hydrogen sulfide (H₂S)?
- 10 ppm
- 50 ppm
- 100 ppm (Correct answer)
- 500 ppm
Correct answer: 100 ppm
NIOSH establishes the IDLH for H₂S at 100 ppm, the concentration above which escape without respiratory protection becomes impaired or life-threatening.
Question 4: Which of the following is a key component of an effective hearing conservation program (HCP) in mining?
- Annual audiometric testing for noise-exposed miners (Correct answer)
- Monthly inspection of mining equipment
- Daily air sampling for dust
- Quarterly safety meetings
Correct answer: Annual audiometric testing for noise-exposed miners
Annual audiometric testing is a core HCP element required by MSHA to detect early signs of NIHL and trigger further protective measures.
Question 5: In industrial hygiene risk assessment, the 'anticipation' step involves:
- Measuring existing contaminant concentrations
- Identifying potential hazards before operations begin or change (Correct answer)
- Selecting appropriate PPE for known hazards
- Evaluating the effectiveness of implemented controls
Correct answer: Identifying potential hazards before operations begin or change
Anticipation is the proactive step of recognizing potential hazards in advance of work activities, enabling preventive controls to be designed in from the start.
Question 6: Which document does MSHA require mine operators to maintain to demonstrate compliance with the Part 90 dust standard for coal miners?
- Material safety data sheet (MSDS)
- Dust control plan and sampling records (Correct answer)
- Annual injury and illness summary
- Emergency response plan
Correct answer: Dust control plan and sampling records
Mine operators must maintain a current approved dust control plan and associated sampling records to demonstrate Part 90 compliance for miners who elect this protection.
CMSP CMSP Occupational Health & Industrial Hygiene 3
Whole-body vibration (WBV) in mining is primarily associated with which type of equipment operation?