STSC Confined Space Entry Procedures 5

Question 1

When testing the atmosphere of a confined space prior to entry, what is the correct order for measuring atmospheric hazards?

Accepted Answer

Oxygen content, then flammability, then toxic contaminants

Answer

OSHA and industry best practice require testing oxygen content first, then flammability (LEL), then toxic contaminants, because low oxygen can affect sensor accuracy.

Question 2

A confined space entry is interrupted by an uncontrolled condition not covered by the existing permit. What must the entry supervisor do?

Accepted Answer

Ensure all entrants immediately exit and cancel the permit

Answer

Any condition not covered or allowed by the permit requires all entrants to exit immediately and the permit to be cancelled until the new hazard is addressed.

Question 3

What is the primary purpose of a retrieval system in confined space entry operations?

Accepted Answer

To enable non-entry rescue of an entrant without requiring rescuers to enter the space

Answer

A retrieval system allows entrants to be extracted from a confined space by the attendant or rescuers without requiring anyone else to enter the hazardous environment.

Question 4

Which scenario would classify a confined space as 'permit-required' under OSHA 29 CFR 1910.146?

Accepted Answer

A utility vault that contains a potential engulfment hazard from accumulated water

Answer

A space with a potential engulfment hazard — such as accumulated water — meets the definition of a permit-required confined space under OSHA.

Question 5

After all entrants have exited and work is complete, what must happen to the entry permit?

Accepted Answer

It must be cancelled, retained by the employer for at least one year, and reviewed to improve the program

Answer

Completed permits must be cancelled and retained for at least one year so employers can review them to identify and correct problems in the permit program.

(STSC) Safety Trained Supervisor Construction Practice Test

(STSC) Safety Trained Supervisor Construction Practice Test

STSC Confined Space Entry Procedures 5