CES Environmental Ergonomics 2

Question 1

The EU Physical Agents (Vibration) Directive sets a daily exposure action value (EAV) for whole-body vibration (WBV) at:

Accepted Answer

0.5 m/s²

Answer

1.15 m/s²

Answer

2.5 m/s²

Answer

5.0 m/s²

Question 2

In ergonomic lighting design, what is the purpose of using task lighting in addition to ambient (general) lighting?

Accepted Answer

To provide targeted higher illuminance at specific work surfaces without over-lighting the entire space

Answer

To reduce overall energy consumption by eliminating ambient fixtures

Answer

To replace natural daylighting when windows are unavailable

Answer

To eliminate all shadows in the workspace

Question 3

Relative humidity in an office environment is ideally maintained in which range to balance occupant comfort and minimize health complaints?

Accepted Answer

30–60%

Answer

10–20%

Answer

65–75%

Answer

80–90%

Question 4

Which control measure is the most effective ergonomic intervention for reducing whole-body vibration exposure in vehicle operators?

Accepted Answer

Installing a suspension seat with a low-transmissibility rating

Answer

Requiring operators to wear anti-vibration gloves

Answer

Scheduling shorter work shifts only

Answer

Applying vibration-dampening floor mats

Question 5

An ergonomist discovers that workers near a noisy machine experience noise levels of 95 dBA. Under OSHA's noise standard (29 CFR 1910.95), what is the maximum permissible exposure duration at this level?

Accepted Answer

4 hours

Answer

8 hours

Answer

2 hours

Answer

1 hour

Question 6

The 'thermal comfort zone' described in ASHRAE Standard 55 is primarily determined by which combination of factors?

Accepted Answer

Operative temperature, humidity, air speed, and clothing/activity levels

Answer

Air temperature and carbon dioxide concentration

Answer

Surface reflectance and illuminance levels

Answer

Barometric pressure and oxygen concentration

Question 7

Which indoor air pollutant is most commonly associated with 'sick building syndrome' and is primarily emitted from building materials, furniture, and adhesives?

Accepted Answer

Volatile organic compounds (VOCs)

Answer

Carbon monoxide (CO)

Answer

Radon gas

Answer

Particulate matter (PM2.5)