Hazmat Ops - MFRI - chapter 5 UPDATED
ACTUAL Exam Questions and CORRECT
Answers
Threshold Limit Value (TLV) - CORRECT ANSWER - the point at which a hazardous
material begins to affect a person
Permissable Exposure Level (PEL) - CORRECT ANSWER - the established standard limit
of exposure to a hazardous material
threshold limit value/short term exposure limit - CORRECT ANSWER - the maximum
concentration of a hazardous material that a person can be exposed to in 15 minute intervals, up
to four time per day, without experiencing irritation or chronic or irreversible tissue damage
threshold limit value/time weighted average - CORRECT ANSWER - maximum airborne
concentration of a hazardous material that a worker should not be exposed to, even for an instant
threshold limit value/skin - CORRECT ANSWER - indicates that direct or airborne
contact with a material could result in possible and significant exposure from absorption through
the skin, mucous membranes, and eyes.
Recommended exposure level (REL) - CORRECT ANSWER - a value established by the
National Institute for Occupational Safety and Health and is comparable to OSHAs PEL.
Immediate danger to life and health (IDLH) - CORRECT ANSWER - an atmospheric
concentration of a toxic, corrosive, or asphyxiant substance poses an immediate threat to life or
could cause irreversible or delayed adverse health effects.
safe atmosphere - CORRECT ANSWER - no harmful hazardous material effects exist, so
personnel can handle routine emergencies without donning specialized PPE.
, unsafe atmosphere - CORRECT ANSWER - a hazardous material that is not longer
contained has created an unsafe condition or atmosphere. A person who is exposed to the
material for long enough will probably experience some form of acute or chronic injury
dangerous atmosphere - CORRECT ANSWER - serious, irreversible injury or death can
occur in the environment without PPE
yellow environments - CORRECT ANSWER - are transitional, whereby hazard is
increasing, and some level of PPE is required
green environments - CORRECT ANSWER - could be considered low hazard and low
risk. do not require PPE
red environments - CORRECT ANSWER - are those that pose a high hazard and high risk;
therefore you must wear the highest level of skin and respiratory protection
isolation of the hazard area - CORRECT ANSWER - one of the first actions responders
must take at a hazardous material incident
nonintervention - CORRECT ANSWER - occurs when the hazard of entering the hot zone
is too great for some reason allowing the incident to self stabilize makes more sense and is much
safer.
level A ensemble - CORRECT ANSWER - fully encapsulating garment that completely
envelops both the wearer and the respiratory protection, gloves, boots and communications
equipment. This is used when the hazardous material identify requires the highest level of
protection for the skin, eyes and respiratory tract.
level B ensemble - CORRECT ANSWER - consists of chemical protective clothing, boots,
gloves and SCBA. This type of PPE should be used when the type and atmospheric
concentration of identified substances require a high level of respiratory protection but less skin
protection.
ACTUAL Exam Questions and CORRECT
Answers
Threshold Limit Value (TLV) - CORRECT ANSWER - the point at which a hazardous
material begins to affect a person
Permissable Exposure Level (PEL) - CORRECT ANSWER - the established standard limit
of exposure to a hazardous material
threshold limit value/short term exposure limit - CORRECT ANSWER - the maximum
concentration of a hazardous material that a person can be exposed to in 15 minute intervals, up
to four time per day, without experiencing irritation or chronic or irreversible tissue damage
threshold limit value/time weighted average - CORRECT ANSWER - maximum airborne
concentration of a hazardous material that a worker should not be exposed to, even for an instant
threshold limit value/skin - CORRECT ANSWER - indicates that direct or airborne
contact with a material could result in possible and significant exposure from absorption through
the skin, mucous membranes, and eyes.
Recommended exposure level (REL) - CORRECT ANSWER - a value established by the
National Institute for Occupational Safety and Health and is comparable to OSHAs PEL.
Immediate danger to life and health (IDLH) - CORRECT ANSWER - an atmospheric
concentration of a toxic, corrosive, or asphyxiant substance poses an immediate threat to life or
could cause irreversible or delayed adverse health effects.
safe atmosphere - CORRECT ANSWER - no harmful hazardous material effects exist, so
personnel can handle routine emergencies without donning specialized PPE.
, unsafe atmosphere - CORRECT ANSWER - a hazardous material that is not longer
contained has created an unsafe condition or atmosphere. A person who is exposed to the
material for long enough will probably experience some form of acute or chronic injury
dangerous atmosphere - CORRECT ANSWER - serious, irreversible injury or death can
occur in the environment without PPE
yellow environments - CORRECT ANSWER - are transitional, whereby hazard is
increasing, and some level of PPE is required
green environments - CORRECT ANSWER - could be considered low hazard and low
risk. do not require PPE
red environments - CORRECT ANSWER - are those that pose a high hazard and high risk;
therefore you must wear the highest level of skin and respiratory protection
isolation of the hazard area - CORRECT ANSWER - one of the first actions responders
must take at a hazardous material incident
nonintervention - CORRECT ANSWER - occurs when the hazard of entering the hot zone
is too great for some reason allowing the incident to self stabilize makes more sense and is much
safer.
level A ensemble - CORRECT ANSWER - fully encapsulating garment that completely
envelops both the wearer and the respiratory protection, gloves, boots and communications
equipment. This is used when the hazardous material identify requires the highest level of
protection for the skin, eyes and respiratory tract.
level B ensemble - CORRECT ANSWER - consists of chemical protective clothing, boots,
gloves and SCBA. This type of PPE should be used when the type and atmospheric
concentration of identified substances require a high level of respiratory protection but less skin
protection.
