CHST Confined Space Entry and Rescue 2

Question 1

Under OSHA definitions, 'engulfment' in a confined space refers to:

Accepted Answer

The surrounding and effective capture of a person by finely divided solids or liquid

Answer

OSHA defines engulfment as the surrounding and effective capture of a person by a liquid or finely divided flowable solid, which can cause asphyxiation, strangulation, constriction, or crushing.

Question 2

When a non-permit confined space must be reclassified as permit-required, which condition most commonly triggers this change?

Accepted Answer

Work activities inside the space create additional hazards such as welding fumes or oxygen displacement

Answer

When work performed inside a non-permit confined space introduces new hazards—such as welding that generates toxic fumes or displaces oxygen—the space must be reclassified as permit-required.

Question 3

Which type of forced ventilation is most effective for purging a confined space of vapors heavier than air?

Accepted Answer

Forced air supply directed near the bottom of the space

Answer

Vapors heavier than air settle at the lowest points of confined spaces; directing forced air supply near the bottom effectively displaces and purges these vapors upward and out.

Question 4

What information is NOT required on an OSHA-compliant confined space entry permit?

Accepted Answer

The employer's general liability insurance policy number

Answer

Entry permits must contain safety and operational information including space identification, hazards, atmospheric test results, authorized personnel, and emergency procedures—not financial or insurance data.

Question 5

A hydrogen sulfide (H₂S) concentration of 300 ppm inside a confined space represents what condition?

Accepted Answer

An IDLH (Immediately Dangerous to Life or Health) condition

Answer

NIOSH establishes the IDLH for hydrogen sulfide at 100 ppm; a concentration of 300 ppm far exceeds this threshold and represents an immediately life-threatening condition requiring immediate evacuation.

CHST - Construction Health and Safety Technician Practice Test

CHST - Construction Health and Safety Technician Practice Test

CHST Confined Space Entry and Rescue 2