CPE CPE Environmental Ergonomics Questions and Answers 2

Question 1

The predicted mean vote (PMV) index by Fanger predicts thermal comfort based on how many variables?

Accepted Answer

6

Answer

Fanger's PMV model uses six variables: air temperature, radiant temperature, air velocity, humidity, metabolic rate, and clothing insulation (clo).

Question 2

What is the primary ergonomic concern with vibration frequencies in the range of 4–8 Hz for seated workers?

Accepted Answer

Resonance with the lumbar spine, increasing injury risk

Answer

The 4–8 Hz frequency range resonates with the lumbar spine and abdomen of seated workers, amplifying internal vibration and increasing low back disorder risk.

Question 3

Carbon dioxide (CO2) concentration in an office space above what level is considered an indicator of inadequate ventilation?

Accepted Answer

1,000 ppm

Answer

ASHRAE guideline 62.1 uses 1,000 ppm CO2 as an indicator that outdoor air ventilation is insufficient, correlating with increased occupant complaints.

Question 4

Illuminance is measured in which unit?

Accepted Answer

Lux (lx)

Answer

Illuminance is the amount of light falling on a surface, measured in lux (lx) where 1 lux equals 1 lumen per square meter.

Question 5

Heat acclimatization for workers newly exposed to hot environments typically requires how many days to achieve significant physiological adaptation?

Accepted Answer

7–14 days

Answer

Meaningful heat acclimatization — including improved sweating efficiency and cardiovascular adaptation — typically requires 7–14 days of progressive heat exposure.

(CPE) Certified Professional Ergonomist Practice Test

(CPE) Certified Professional Ergonomist Practice Test

CPE CPE Environmental Ergonomics Questions and Answers 2