CHST Confined Space Entry and Rescue

Question 1

Which OSHA standard specifically governs confined spaces in construction?

Accepted Answer

29 CFR 1926 Subpart AA (1926.1200-1213)

Answer

29 CFR 1910.146

Answer

29 CFR 1926.502

Answer

29 CFR 1926.650

Question 2

What oxygen concentration range is considered acceptable for entry into a confined space?

Accepted Answer

19.5% to 23.5%

Answer

14.5% to 23.5%

Answer

16% to 21%

Answer

18% to 25%

Question 3

Before an authorized entrant enters a permit-required confined space, which atmospheric tests must be conducted?

Accepted Answer

Oxygen content, flammable gases, and toxic contaminants

Answer

Oxygen content only

Answer

Flammable gases only

Answer

Carbon monoxide only

Question 4

At what percentage of the Lower Explosive Limit (LEL) must workers immediately evacuate a permit-required confined space?

Accepted Answer

10% LEL

Answer

5% LEL

Answer

15% LEL

Answer

25% LEL

Question 5

Who has the authority and responsibility to cancel a confined space entry permit if conditions become unsafe?

Accepted Answer

The entry supervisor

Answer

The authorized entrant

Answer

The attendant

Answer

The company safety director

Question 6

What is the primary role of the confined space attendant during entry operations?

Accepted Answer

To remain outside, monitor entrants and conditions, and initiate rescue if needed

Answer

To assist entrants with work tasks from just inside the entrance

Answer

To continuously test the atmosphere inside the confined space

Answer

To document entry procedures for compliance records

Question 7

A confined space is classified as 'permit-required' when it meets the definition of a confined space AND:

Accepted Answer

Contains or has the potential to contain a serious safety or health hazard

Answer

Has a volume of less than 300 cubic feet

Answer

Requires more than one worker to perform tasks inside

Answer

Is located below grade or underground