SHP Environmental Health & Industrial Hygiene 2 ā Questions and Answers
Question 1: Which sequence correctly represents the industrial hygiene process?
- Recognition ā Anticipation ā Evaluation ā Control
- Anticipation ā Recognition ā Evaluation ā Control (Correct answer)
- Evaluation ā Recognition ā Anticipation ā Control
- Recognition ā Evaluation ā Anticipation ā Control
Correct answer: Anticipation ā Recognition ā Evaluation ā Control
The industrial hygiene process begins with Anticipation (predicting potential hazards), then Recognition (identifying existing hazards), Evaluation (measuring exposure), and Control (implementing corrective measures).
Question 2: The Wet Bulb Globe Temperature (WBGT) index is the standard tool used to evaluate which occupational health hazard?
- Chemical vapor concentration
- Noise-induced hearing loss risk
- Heat stress in outdoor and indoor environments (Correct answer)
- Ionizing radiation dose rates
Correct answer: Heat stress in outdoor and indoor environments
WBGT is a composite temperature index incorporating dry bulb temperature, natural wet bulb temperature, and globe temperature to assess heat stress risk for workers.
Question 3: Ultraviolet (UV) radiation produced during welding operations is classified as which type of radiation?
- Ionizing radiation
- Non-ionizing radiation (Correct answer)
- Particulate radiation
- Neutron radiation
Correct answer: Non-ionizing radiation
UV radiation from welding is non-ionizing radiation because it lacks sufficient energy to remove electrons from atoms, unlike X-rays or gamma rays which are ionizing.
Question 4: Which air sampling approach is most appropriate for comparing a worker's exposure to an 8-hour time-weighted average occupational exposure limit?
- Short-term grab sampling
- Fixed area sampling
- Full-shift personal breathing zone sampling (Correct answer)
- Peak ceiling value sampling
Correct answer: Full-shift personal breathing zone sampling
Full-shift personal sampling captures the worker's breathing zone exposure across the entire work period, which is the appropriate method for comparing to 8-hour TWA occupational exposure limits.
Question 5: Why is local exhaust ventilation (LEV) generally preferred over general dilution ventilation for controlling chemical exposures?
- LEV systems are significantly less expensive to install and maintain
- LEV captures contaminants at or near the source before they disperse into the work environment (Correct answer)
- Dilution ventilation requires more complex airflow design calculations
- LEV is more effective in large open work areas with multiple contaminant sources
Correct answer: LEV captures contaminants at or near the source before they disperse into the work environment
LEV removes contaminants at the point of generation before they can enter workers' breathing zones, making it far more protective than dilution ventilation which disperses contaminants throughout the space.
Question 6: Which combination of ergonomic risk factors most significantly increases the risk of work-related musculoskeletal disorders (MSDs)?
- Adequate lighting and proper workstation height
- Repetitive motion combined with awkward posture and high force exertions (Correct answer)
- Infrequent heavy lifting using proper body mechanics
- Using well-fitted personal protective equipment consistently
Correct answer: Repetitive motion combined with awkward posture and high force exertions
The combination of repetitive motion, awkward posture, and forceful exertions creates cumulative trauma that dramatically elevates MSD risk, as each factor compounds the others.
Question 7: OSHA's Respirable Crystalline Silica standard (29 CFR 1910.1053) establishes a PEL of how many micrograms per cubic meter for general industry?
- 100 Āµg/mĀ³ as an 8-hour TWA
- 50 Āµg/mĀ³ as an 8-hour TWA (Correct answer)
- 250 Āµg/mĀ³ as an 8-hour TWA
- 10 Āµg/mĀ³ as an 8-hour TWA
Correct answer: 50 Āµg/mĀ³ as an 8-hour TWA
OSHA's silica PEL is 50 Āµg/mĀ³ as an 8-hour TWA for general industry, a significant reduction from previous limits due to the serious risk of silicosis and lung cancer.
SHP Environmental Health & Industrial Hygiene 2
Which sequence correctly represents the industrial hygiene process?