Ammonia Refrigeration Exam
Questions and Answers (Latest
Update 2026)
OSHA stands for what? -
correct answer ✅Occupational Safety and Health Administration
Permissible Exposure Limit (PEL) -
correct answer ✅The level of exposure to a hazardous substance
based on a 8- hour time weighted average, at or above which an
individual must use Personal Protective Equipment.
(The limit can range from 25-50 PPM.)
At ICS we use 25PPM.
Immediate danger to life and health (IDLH) -
correct answer ✅The level of exposure to a hazardous substance
which may result in immediate, irreversible damage to life or health
or may impair your ability to escape.
*300PPM based on a 1 hour hour exposure is considered an
amount for (IDLH)
*500ppm and above you must me in a level A suit.
Lower Explosive Limit (LEL) -
correct answer ✅The concentration of an non-flammable
explosive substance below which the mixture is to lean to explode.
, Ammonia Refrigeration Exam
Questions and Answers (Latest
Update 2026)
15-16%= 150,000ppm= Pure ammonia
5-7%= 50,000-70,000ppm
Cant see pure ammonia vapors
atmospheric pressure -
correct answer ✅14.7 psi
Upper Explosive Limit (UEL) -
correct answer ✅The concentration of a non-Flammable explosive
substance above which the mixture is too rich to explode.
28%- 280,000 PPM
Between (UEL) and (LEL) -
correct answer ✅In between is explosive
No oxygen -
correct answer ✅= No Fire
Questions and Answers (Latest
Update 2026)
OSHA stands for what? -
correct answer ✅Occupational Safety and Health Administration
Permissible Exposure Limit (PEL) -
correct answer ✅The level of exposure to a hazardous substance
based on a 8- hour time weighted average, at or above which an
individual must use Personal Protective Equipment.
(The limit can range from 25-50 PPM.)
At ICS we use 25PPM.
Immediate danger to life and health (IDLH) -
correct answer ✅The level of exposure to a hazardous substance
which may result in immediate, irreversible damage to life or health
or may impair your ability to escape.
*300PPM based on a 1 hour hour exposure is considered an
amount for (IDLH)
*500ppm and above you must me in a level A suit.
Lower Explosive Limit (LEL) -
correct answer ✅The concentration of an non-flammable
explosive substance below which the mixture is to lean to explode.
, Ammonia Refrigeration Exam
Questions and Answers (Latest
Update 2026)
15-16%= 150,000ppm= Pure ammonia
5-7%= 50,000-70,000ppm
Cant see pure ammonia vapors
atmospheric pressure -
correct answer ✅14.7 psi
Upper Explosive Limit (UEL) -
correct answer ✅The concentration of a non-Flammable explosive
substance above which the mixture is too rich to explode.
28%- 280,000 PPM
Between (UEL) and (LEL) -
correct answer ✅In between is explosive
No oxygen -
correct answer ✅= No Fire
