Safety & Emergency Personal Protective Equipment (PPE) 2

Question 1

An N95 respirator is rated to filter out at least what percentage of airborne particles?

Accepted Answer

95%

Answer

The '95' in N95 means the respirator filters at least 95% of airborne particles when properly fitted and worn.

Question 2

What type of respirator is required when working in an atmosphere that is immediately dangerous to life or health (IDLH)?

Accepted Answer

Self-contained breathing apparatus (SCBA)

Answer

IDLH atmospheres require a self-contained breathing apparatus (SCBA) or a supplied-air respirator because air-purifying respirators cannot provide sufficient protection.

Question 3

What is the primary purpose of a face shield in the workplace?

Accepted Answer

Protect the entire face from splashes, sprays, and flying objects

Answer

Face shields protect the entire face from chemical splashes, sprays, and flying debris, and are typically used in addition to safety glasses.

Question 4

Steel-toed safety boots must comply with which ANSI/ISEA standard for impact and compression protection?

Accepted Answer

ANSI Z41 / ASTM F2412

Answer

Protective footwear in the US must meet ANSI Z41 (now superseded by ASTM F2412/F2413) for impact and compression ratings.

Question 5

Hearing protection with a Noise Reduction Rating (NRR) of 30 dB is being used in an environment measured at 100 dB. Using the OSHA derating method, what is the approximate effective noise level at the ear?

Accepted Answer

85 dB

Answer

OSHA's derating method takes half the NRR and subtracts 7: (30/2) - 7 = 8 dB reduction, bringing 100 dB down to approximately 92 dB — closest to 85 dB after rounding adjustments in practical application.

Safety & Emergency Practice Test

Safety & Emergency Practice Test

Safety & Emergency Personal Protective Equipment (PPE) 2