Answers Verified by Experts
Which of the following statements regarding changes in SCBA is INCORRECT?
-The weight of standard 30 minute SCBA has been reduced approximately 40% since 1980
-New regulation designs provide increased airflow and redundancy
-All SCBA used or manufactured for fire department must not be positive pressure
-Newer SCBA units have the PASS device incorporated in the unit All SCBA used or
manufactured for fire department must not be positive pressure
When tightening the straps on a SCBA face piece, the ______ straps should always be tightened
first. Lower
As the oxygen supply in any given area falls below _____ percent, unconsciousness can occur.
9
The FIRST noticeable sign of oxygen deficiency are: Increased respiratory rate and
impaired muscular coordination
,Four hazardous atmospheres that firefighters are likely to encounter at a fire are super-
heated air, toxic gases, oxygen deficiency, and smoke
The open-circuit, positive pressure breathing apparatus operates by: maintaining a
pressure inside the mask that is slightly higher than atmospheric pressure.
Rescue from sewers, grain silos, and similarly confined spaces requires the use of self-contained
breathing apparatus due to the danger of: Toxic gases and oxygen deficiency
PASS devices are designed to assist rescuers attempting to? locate trapped firefighters
All breathing apparatus must be stored so that it is ready to be: donned and used
Trapped firefighters awaiting rescue will use less air if they control their breathing
A closed circuit or "rebeather" type breathing apparatus uses a cylinder of ______ in its
operation. Oxygen
, The Primary function of the bypass valve on SCBA is: for use if the regulator fails
The proper position of the bypass valve on positive-pressure SCBA under normal conditions is:
Fully closed
All SCBA regulators should ;be provided with a _________ valve to be opened in the event of
regulator failure. bypass
A firefighter is susceptible to poisoning or irritation from carbon monoxide through:
inhalation
Which type of breathing apparatus recycles the users exhaled breath after removing carbon
dioxide and adding supplement oxygen? Closed-circuit
What are the two general types of self-contained breathing apparatus? open-circuit and
closed-circuit
On breathing apparatus equipped with a low pressure hose, the low-pressure hose brings air from
the: Regulator to the face piece