OHST Industrial Hygiene & Exposure Assessment

Question 1

What does the acronym TLV-TWA stand for in industrial hygiene?

Accepted Answer

Threshold Limit Value - Time-Weighted Average

Answer

TLV-TWA stands for Threshold Limit Value - Time-Weighted Average, representing the average airborne concentration for a normal 8-hour workday published by ACGIH.

Question 2

Which organization publishes Permissible Exposure Limits (PELs) that are legally enforceable in U.S. workplaces?

Accepted Answer

OSHA

Answer

OSHA publishes PELs as legally enforceable federal standards under the Occupational Safety and Health Act.

Question 3

What is the purpose of the Short-Term Exposure Limit (STEL)?

Accepted Answer

To set the maximum concentration for a 15-minute period not to be exceeded

Answer

The STEL is the maximum concentration to which workers can be exposed for up to 15 minutes without suffering acute adverse effects.

Question 4

The designation 'IDLH' in industrial hygiene represents a concentration that is:

Accepted Answer

Immediately Dangerous to Life or Health

Answer

IDLH (Immediately Dangerous to Life or Health) is a NIOSH value representing the maximum concentration from which one could escape without irreversible health effects.

Question 5

Which route of entry is typically the primary concern for most airborne industrial chemicals?

Accepted Answer

Inhalation

Answer

Inhalation is the primary exposure route for airborne chemicals because the lungs provide a large surface area and rapid transfer into the bloodstream.

OHST Exam Practice Test

OHST Exam Practice Test

OHST Industrial Hygiene & Exposure Assessment