Safety Trained Supervisor Basic Industrial Hygiene Questions and Answers 1 — Questions and Answers
Question 1: An industrial hygienist is evaluating worker exposure to an airborne chemical. Which of the following is considered the MOST common route of exposure for workplace chemicals?
- Absorption (skin contact)
- Ingestion (swallowing)
- Inhalation (breathing) (Correct answer)
- Injection (skin puncture)
Correct answer: Inhalation (breathing)
Inhalation is the most common and often most dangerous route of exposure in the workplace because airborne contaminants like gases, vapors, and dusts can be easily and quickly breathed into the lungs and absorbed into the bloodstream.
Question 2: A supervisor at a manufacturing plant needs to evaluate noise levels for workers who move between several noisy areas throughout their shift. Which instrument is BEST suited for measuring an individual worker's total noise dose over an 8-hour day?
- An octave band analyzer
- A sound level meter
- A noise dosimeter (Correct answer)
- An acoustic calibrator
Correct answer: A noise dosimeter
A noise dosimeter is a small, body-worn device that measures and stores a worker's cumulative noise exposure throughout their entire shift. This is the ideal instrument for mobile workers or those in environments with fluctuating noise levels, as it provides a time-weighted average (TWA) exposure.
Question 3: Which of the following is a key difference between OSHA's Permissible Exposure Limits (PELs) and the ACGIH's Threshold Limit Values (TLVs)?
- TLVs are legally enforceable federal standards, while PELs are recommendations.
- PELs are based solely on health factors, while TLVs consider economic feasibility.
- PELs are legally enforceable limits, while TLVs are health-based guidelines. (Correct answer)
- TLVs are updated less frequently than OSHA PELs.
Correct answer: PELs are legally enforceable limits, while TLVs are health-based guidelines.
OSHA's PELs are legal limits in the United States that employers must comply with. ACGIH TLVs are recommendations developed by a scientific organization based on available health data and are not legally enforceable, though they are often considered industry best practice and may be more protective than the often-outdated PELs.
Question 4: At a welding station, a new ventilation system is installed that uses a capture hood to draw fumes away from the welder's breathing zone before they can spread into the general work area. This type of system is known as:
- General dilution ventilation
- Comfort ventilation
- Natural ventilation
- Local exhaust ventilation (LEV) (Correct answer)
Correct answer: Local exhaust ventilation (LEV)
Local exhaust ventilation (LEV) is an engineering control designed to capture and remove contaminants at or very near their source. This is in contrast to general or dilution ventilation, which reduces contaminant levels by mixing clean air into the entire workspace.
Question 5: The fundamental principles of industrial hygiene are often summarized as a four-step process. Which of the following correctly lists these four steps in their logical order?
- Evaluation, Recognition, Control, Anticipation
- Recognition, Control, Evaluation, Anticipation
- Anticipation, Recognition, Evaluation, Control (Correct answer)
- Control, Anticipation, Recognition, Evaluation
Correct answer: Anticipation, Recognition, Evaluation, Control
The correct sequence of the industrial hygiene process is Anticipation (proactively considering potential hazards), Recognition (identifying existing hazards), Evaluation (assessing the level of exposure and risk), and Control (implementing measures to reduce or eliminate the hazard).
Question 6: A supervisor in a healthcare facility is concerned about workers' potential exposure to infectious diseases when handling patient samples. This type of workplace hazard falls into which category?
- Chemical Hazard
- Physical Hazard
- Ergonomic Hazard
- Biological Hazard (Correct answer)
Correct answer: Biological Hazard
Biological hazards include exposure to living organisms such as bacteria, viruses, fungi, and other microorganisms that can cause illness. In a healthcare setting, handling patient samples poses a risk of exposure to bloodborne pathogens and other infectious agents, which are classic examples of biological hazards.
Safety Trained Supervisor Basic Industrial Hygiene Questions and Answers 1
An industrial hygienist is evaluating worker exposure to an airborne chemical.
Which of the following is considered the MOST common route of exposure for workplace chemicals?