CIH Personal Protective Equipment (PPE) 2

Question 1

What is the OSHA-assigned Assigned Protection Factor (APF) for a powered air-purifying respirator (PAPR) with a loose-fitting facepiece?

Accepted Answer

25

Answer

OSHA assigns an APF of 25 to PAPRs with loose-fitting facepieces; the continuous positive airflow reduces but does not fully eliminate inward leakage.

Question 2

How is Maximum Use Concentration (MUC) calculated using the Assigned Protection Factor (APF)?

Accepted Answer

MUC = OEL × APF

Answer

MUC = OEL × APF represents the highest airborne concentration at which a respirator may be used while still providing adequate worker protection.

Question 3

Which type of eye protection provides complete perimeter sealing around the orbital area and is required when handling liquid chemical splash hazards?

Accepted Answer

Chemical splash goggles

Answer

Chemical splash goggles use indirect ventilation and a sealed perimeter to prevent liquid chemicals from reaching the eyes from any direction.

Question 4

What is the minimum filtration efficiency required for an N95 respirator to receive NIOSH approval?

Accepted Answer

95%

Answer

N95 respirators must filter at least 95% of airborne particles (0.3 micron test aerosol) to receive NIOSH approval under the N-series classification.

Question 5

What is the best estimate of combined noise attenuation when an employee wears both earplugs and earmuffs simultaneously?

Accepted Answer

Add 5 dB to the higher NRR value

Answer

When dual hearing protection is used, OSHA and NIOSH recommend adding approximately 5 dB to the higher NRR because bone conduction limits the combined attenuation achievable.

CIH - Certified Industrial Hygienist Exam Practice Test

CIH - Certified Industrial Hygienist Exam Practice Test

CIH Personal Protective Equipment (PPE) 2