Industrial Refrigeration Ammonia
exam questions and answers
2025(graded A+)
OSHA - answer Occupational Safety and Health Administration
EPA - answer Environmental Protection Agency
hazardous chemical - answer Any chemical that is a health hazard
or a physical hazard
MSDS - answer Material Safety Data Sheet
Hazardous routes of entry - answer Absorption, Inhalation,
Ingestion, and Injection
PEL - answer Permissible Exposure Limit
Permissible Exposure Limit (PEL) - answer the maximum legal
limits established by OSHA for regulated substances. These are
based on employee exposure that is time weighted over an 8 hour
work shift. When these limits are exceeded, employers must take
proper steps to reduce employee exposure. For ammonia, the PEL is
50 ppm.
IDHL - answer Immediately Dangerous to Life and Health
LEL - answer Lower Explosive Limit, for Ammonia 15%
, UEL - answer Upper Explosive Limit, for Ammonia 28%
Vapor Density - answer Weight of a given volume of pure vapor or
gas compared to the weight of an equal volume of dry air at the
same temperature and pressure. A ___________ less than 1 indicates a
vapor lighter than air; a ___________ greater than 1 indicates a vapor
heavier than air. for ammonia, .6
Aerosols - answer a substance consisting of very fine particles of a
liquid or solid suspended in a gas
NRC - answer National Response Center (800)-424-8802
NH3 - answer ammonia
-28 degrees F - answer Ammonia boiling point
exothermic reaction - answer A reaction that releases energy in
the form of heat
Hydrostatic expansion - answer pressure due to temperature rise
of liquid refrigerant trapped in or between closed valves.
pull tube, electronic - answer the two forms of monitoring
Fire Diamond - answer designed for emergencies when information
about the effects of short, or acute, exposure is needed. Specific
hazard, health hazard, fire hazard, and reactivity
pressure - answer force/area
exam questions and answers
2025(graded A+)
OSHA - answer Occupational Safety and Health Administration
EPA - answer Environmental Protection Agency
hazardous chemical - answer Any chemical that is a health hazard
or a physical hazard
MSDS - answer Material Safety Data Sheet
Hazardous routes of entry - answer Absorption, Inhalation,
Ingestion, and Injection
PEL - answer Permissible Exposure Limit
Permissible Exposure Limit (PEL) - answer the maximum legal
limits established by OSHA for regulated substances. These are
based on employee exposure that is time weighted over an 8 hour
work shift. When these limits are exceeded, employers must take
proper steps to reduce employee exposure. For ammonia, the PEL is
50 ppm.
IDHL - answer Immediately Dangerous to Life and Health
LEL - answer Lower Explosive Limit, for Ammonia 15%
, UEL - answer Upper Explosive Limit, for Ammonia 28%
Vapor Density - answer Weight of a given volume of pure vapor or
gas compared to the weight of an equal volume of dry air at the
same temperature and pressure. A ___________ less than 1 indicates a
vapor lighter than air; a ___________ greater than 1 indicates a vapor
heavier than air. for ammonia, .6
Aerosols - answer a substance consisting of very fine particles of a
liquid or solid suspended in a gas
NRC - answer National Response Center (800)-424-8802
NH3 - answer ammonia
-28 degrees F - answer Ammonia boiling point
exothermic reaction - answer A reaction that releases energy in
the form of heat
Hydrostatic expansion - answer pressure due to temperature rise
of liquid refrigerant trapped in or between closed valves.
pull tube, electronic - answer the two forms of monitoring
Fire Diamond - answer designed for emergencies when information
about the effects of short, or acute, exposure is needed. Specific
hazard, health hazard, fire hazard, and reactivity
pressure - answer force/area
