OHST Industrial Hygiene & Exposure Assessment 3

Question 1

According to the hierarchy of controls, which control method is considered most effective for eliminating chemical hazards?

Accepted Answer

Elimination or substitution of the hazard

Answer

Elimination removes the hazard entirely and substitution replaces it with a less hazardous option; both rank at the top of the hierarchy of controls.

Question 2

A local exhaust ventilation (LEV) system reduces worker exposure by:

Accepted Answer

Capturing contaminants at or near their source before they reach the breathing zone

Answer

LEV systems capture contaminants at their source of generation, preventing them from dispersing into the work environment and exposing workers.

Question 3

Which level of respiratory protection is considered the minimum for protection against nuisance dusts in an otherwise safe atmosphere?

Accepted Answer

N95 filtering facepiece respirator

Answer

An N95 filtering facepiece respirator filters at least 95% of airborne particles and is appropriate minimum protection for nuisance dusts.

Question 4

OSHA requires employers to establish a written respiratory protection program when:

Accepted Answer

Any employee uses a respirator in the workplace

Answer

OSHA 29 CFR 1910.134 requires a written respiratory protection program whenever any employee uses a respirator, including certain voluntary use situations.

Question 5

What is the primary advantage of engineering controls over other control methods in industrial hygiene?

Accepted Answer

They reduce exposure without relying on worker behavior or compliance

Answer

Engineering controls physically modify the work environment or process to reduce exposure, making them effective regardless of worker behavior or compliance.

OHST Exam Practice Test

OHST Exam Practice Test

OHST Industrial Hygiene & Exposure Assessment 3