CMC Regulatory Compliance and Standards 2

Question 1

Under OSHA 29 CFR 1915.12, what is the minimum acceptable oxygen concentration for a worker to enter a confined space without supplied-air respiratory protection?

Accepted Answer

19.5%

Answer

16.0%

Answer

18.0%

Answer

20.5%

Question 2

NFPA 306 classifies a vessel space as 'Gas Free' for hot work when flammable vapor concentration is at or below what percentage of the Lower Explosive Limit (LEL)?

Accepted Answer

10%

Answer

0%

Answer

5%

Answer

25%

Question 3

Which federal regulation specifically governs hot work operations aboard vessels in shipyards and requires a Marine Chemist certificate for certain operations?

Accepted Answer

46 CFR Part 35

Answer

29 CFR 1910.146

Answer

29 CFR 1915.14

Answer

49 CFR Part 172

Question 4

Under 29 CFR 1915.7, who is authorized to certify a vessel space as safe for hot work when a Marine Chemist is not available?

Accepted Answer

A Coast Guard Marine Inspector or a shipyard competent person

Answer

A licensed ship officer

Answer

Any OSHA-trained safety officer

Answer

A certified industrial hygienist

Question 5

When testing a confined space atmosphere before entry, OSHA 29 CFR 1915.12 requires testing to be performed in what sequence?

Accepted Answer

Oxygen, then flammable, then toxic

Answer

Flammable, then toxic, then oxygen

Answer

Toxic, then oxygen, then flammable

Answer

Flammable, then oxygen, then toxic

Question 6

Under NFPA 306, how frequently must a Marine Chemist re-test and re-certify a vessel space during continuous hot work operations if conditions remain unchanged?

Accepted Answer

Only if conditions change or work is interrupted more than 30 minutes

Answer

Every 30 minutes

Answer

Every 2 hours

Answer

Before each new work shift

Question 7

An oxygen concentration of 23.6% in a vessel compartment creates what type of hazard classification under OSHA 29 CFR 1915?

Accepted Answer

Oxygen-enriched atmosphere

Answer

Oxygen-deficient atmosphere

Answer

Immediately Dangerous to Life or Health (IDLH)

Answer

Non-permit required confined space