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Environmental Ergonomics Flashcards

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

Read the first 7 Environmental Ergonomics flashcards as text

  1. According to OSHA's permissible exposure limit (PEL), what is the maximum noise exposure allowed for an 8-hour workday without hearing protection?

    Answer: 90 dBA

    OSHA's PEL for noise is 90 dBA as an 8-hour time-weighted average (TWA); exposure above this requires engineering controls or hearing protection.

  2. What is the recommended illuminance level (in foot-candles) for general office tasks such as reading and writing according to the Illuminating Engineering Society (IES)?

    Answer: 30–50 fc

    IES recommends 30–50 foot-candles (300–500 lux) for general office work such as reading printed materials.

  3. Which type of glare occurs when a bright light source is directly within the visual field, causing discomfort or loss of visibility?

    Answer: Discomfort glare

    Discomfort glare causes visual discomfort from a bright source within the field of view, while disability glare actually reduces visual performance.

  4. The Wet Bulb Globe Temperature (WBGT) index is used by ergonomists primarily to assess which environmental stressor?

    Answer: Heat stress

    WBGT integrates air temperature, humidity, radiant heat, and air movement to provide a composite index for evaluating heat stress risk.

  5. According to ASHRAE Standard 55, the recommended operative temperature range for sedentary office work in summer conditions is approximately:

    Answer: 70–76°F (21–24°C)

    ASHRAE 55 specifies approximately 70–76°F (21–24°C) for sedentary work in summer, accounting for lighter clothing insulation.

  6. Which metric is used to describe the strength of a light source's ability to reveal colors accurately compared to a reference light?

    Answer: Color rendering index (CRI)

    The Color Rendering Index (CRI) rates a lamp's ability to reproduce colors faithfully, with 100 indicating perfect rendering compared to a reference source.

  7. Hand-arm vibration (HAV) exposure is most closely associated with which occupational health condition?

    Answer: Raynaud's phenomenon (vibration white finger)

    Prolonged HAV exposure causes damage to blood vessels and nerves in the fingers, leading to Raynaud's phenomenon (vibration white finger) characterized by episodic blanching.