Firefighter Technical Rescue 2

Question 1

In confined space rescue, what atmospheric hazard is most commonly fatal to would-be rescuers?

Accepted Answer

Oxygen deficiency

Answer

Oxygen deficiency kills many confined-space rescuers who enter without testing or SCBA.

Question 2

What is the minimum acceptable oxygen concentration for a normal breathable atmosphere in a confined space?

Accepted Answer

19.5%

Answer

OSHA defines 19.5% as the minimum safe oxygen level; below that is oxygen-deficient.

Question 3

During a trench rescue, at what depth does OSHA require a protective system?

Accepted Answer

5 feet

Answer

Trenches 5 feet or deeper require shoring, sloping, or a trench box.

Question 4

What soil action is the leading cause of trench collapse fatalities?

Accepted Answer

Sudden cave-in burying workers

Answer

A sudden cave-in can bury and crush a worker in seconds.

Question 5

Before entering a trench for rescue, spoil piles should be kept how far from the edge?

Accepted Answer

At least 2 feet

Answer

Spoil piles must be set back at least 2 feet to reduce edge loading and fall-in.

Firefighter Practice Test