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Occupational Health and Industrial Hygiene Flashcards

7 cards from real HSE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Occupational Health and Industrial Hygiene flashcards as text

  1. Which OSHA permissible exposure limit (PEL) type represents the maximum concentration a worker can be exposed to for any 15-minute period?

    Answer: Short-term exposure limit (STEL)

    A STEL is the maximum airborne concentration permissible during any 15-minute period, not to be exceeded more than four times per shift.

  2. A worker is exposed to a noise level of 95 dBA for 4 hours per day. According to OSHA's permissible noise standard, what is the maximum additional hours of exposure at 90 dBA allowed?

    Answer: 2 hours

    At 95 dBA the PEL is 4 hours; at 90 dBA it is 8 hours, so the fraction used is 4/4 = 1.0, meaning no additional 90 dBA exposure is allowed without exceeding the dose.

  3. What term describes the process of drawing a contaminant-containing air sample through a collection medium at a known flow rate to measure worker exposure?

    Answer: Active sampling

    Active sampling uses a pump to pull air through a sorbent tube, filter, or impinger at a calibrated flow rate over the sampling period.

  4. Which biological monitoring marker is most appropriate for assessing recent benzene exposure in a worker?

    Answer: Urinary trans,trans-muconic acid

    Trans,trans-muconic acid is a specific urinary metabolite of benzene and is the preferred biological exposure index (BEI) for recent benzene exposure.

  5. According to the hierarchy of controls, which measure most effectively eliminates an occupational health hazard?

    Answer: Substitution of the hazardous substance

    Substitution removes the hazard entirely by replacing it with a less hazardous material, making it the most effective control below elimination.

  6. A gas with a vapor density greater than 1.0 tends to accumulate in which location within an enclosed space?

    Answer: Low-lying areas and floor level

    Vapors denser than air (vapor density > 1) sink and collect at the lowest points of a space, creating oxygen-deficient or flammable zones near the floor.

  7. Which type of ventilation system dilutes contaminated workplace air with fresh air rather than capturing contaminants at their source?

    Answer: General dilution ventilation

    General dilution ventilation introduces fresh air to reduce overall contaminant concentration, unlike local exhaust which captures emissions at the source.