Atmospheric oxygen levels above  ______ at sea level is considered as hazardous atmosphere in confined space:

Which of the following ingredients are required for an atmosphere to become flammable or explosive: (Multiple Answer Question)

Airborne combustible dust at an explosive concentration would obscure vision at a distance of
_____ or less.

All portable electric hand tools and temporary lighting systems should utilize ______.

Which one of the following is not an examples of secondary irritant:

Between _____ of oxygen concentration results in physiologic effects are increased breathing volume, accelerated heartbeat and very poor muscular coordination

In the fermentation process and bacterial action oxygen is ______ :

The use of which of the following gas to inert a confined space has claimed more lives:

Oxygen enrichment refers to air containing more than _____ oxygen in confined space:

The entry permit should be kept on file for a period of ______.

Always test for atmospheric hazards in the following order:
O – Oxygen deficiency
T – Toxic or corrosive atmospheres
F – Flammable or explosive atmospheres

Which one of the following is/are personal fall protection equipment:

Temporary lighting provided in confined space must not be grounded for avoiding electrical shock for operating personnel:

Ventilation is one of the most common engineering controls used in confined spaces

____of all confined space fatalities occur among would-be rescuers: