COSS Safety Skills 4

Question 1

A safety professional is calculating the Incidence Rate (IR) for recordable injuries. The facility had 12 recordable injuries, 200,000 employees, and 450,000 hours worked. What is the correct IR?

Accepted Answer

5.3

Answer

IR = (Number of injuries × 200,000) / Hours worked = (12 × 200,000) / 450,000 = 5.33, rounded to 5.3.

Question 2

Which of the following best describes the 'Swiss Cheese Model' of accident causation?

Accepted Answer

Multiple layers of defenses each have holes, and when holes align an accident occurs

Answer

James Reason's Swiss Cheese Model illustrates that accidents occur when holes in multiple defensive layers (barriers) momentarily align, allowing a hazard to reach the victim.

Question 3

Under OSHA's General Industry standard, the minimum illumination level required in a first aid station is:

Accepted Answer

30 foot-candles

Answer

OSHA 29 CFR 1910.303 and Table S-1 specify a minimum of 30 foot-candles for first aid stations and infirmaries.

Question 4

A combustible dust explosion requires which five elements to be present simultaneously (the 'Dust Explosion Pentagon')?

Accepted Answer

Fuel, oxygen, heat, ignition source, and confinement

Answer

The Dust Explosion Pentagon adds dispersion and confinement to the classic fire triangle, requiring fuel (dust), oxygen, heat (ignition), dispersion, and confinement for a dust explosion.

Question 5

In process safety, a Process Hazard Analysis (PHA) must be performed before initial startup of a covered process and then updated at least every:

Accepted Answer

5 years

Answer

OSHA's PSM standard (29 CFR 1910.119) requires PHAs to be updated and revalidated at least every five years after the initial PHA.

COSS - Certified Occupational Safety Specialist Practice Test

COSS - Certified Occupational Safety Specialist Practice Test

COSS Safety Skills 4