CES Environmental Ergonomics

Question 1

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

Accepted Answer

90 dBA

Answer

85 dBA

Answer

95 dBA

Answer

100 dBA

Question 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)?

Accepted Answer

30–50 fc

Answer

10–20 fc

Answer

70–100 fc

Answer

150–200 fc

Question 3

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

Accepted Answer

Discomfort glare

Answer

Reflected glare

Answer

Disability glare

Answer

Veiling glare

Question 4

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

Accepted Answer

Heat stress

Answer

Noise exposure

Answer

Whole-body vibration

Answer

Indoor air quality

Question 5

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

Accepted Answer

70–76°F (21–24°C)

Answer

64–68°F (18–20°C)

Answer

78–84°F (26–29°C)

Answer

86–90°F (30–32°C)

Question 6

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

Accepted Answer

Color rendering index (CRI)

Answer

Luminous efficacy

Answer

Color temperature (CCT)

Answer

Lux level

Question 7

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

Accepted Answer

Raynaud's phenomenon (vibration white finger)

Answer

Carpal tunnel syndrome

Answer

Lateral epicondylitis

Answer

Thoracic outlet syndrome