RETA CARO
RETA CARO Exam Review Set Graded A 2026
10,000 PPM
1% concentration of Ammonia is equal to what in PPM?
11.6
Ammonia is what on a PH scale?
100, 24
Fill in the blanks: More than _____ pounds released of ammonia in _____ hours is
a reportable release.
Thermal burns, dehydration burns, respiratory damage, and chemical burns.
What are the four primary types of injury that can occur due to exposure to
ammonia?
50
What is the Permissible Exposure Limit (PEL) set forth by Federal OSHA for
ammonia in PPM?
full faced air purifying respirator (APR)
Fill in the blank: The PEL tells an operator that they must put on a ____-_____ ___
_________ __________ if they want to stay in that atmosphere.
300
What is the IDLH (immediately dangerous to life and health) set forth by Federal
OSHA for ammonia in PPM?
15
What is the LEL (lower explosive limit) for ammonia in percentage?
150,000
What is the LEL (lower explosive limit) for ammonia in PPM?
28
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What is the UEL (upper explosive limit) for ammonia in percentage?
280,000
What is the UEL (upper explosive limit) for ammonia in PPM?
Health 3, Flammability 1, Reactivity 0
What is the NFPA diamond for ammonia outdoors?
Health 3, Flammability 3, Reactivity 0
What is the NFPA diamond for ammonia in an enclosed space?
Blue, red, yellow
What colors correspond on the NFPA diamond for ammonia to health,
flammability, and reactivity?
No
Can an operator wear contact lenses at work?
Hydrostatic expansion
Fill in the blank: When liquid ammonia is trapped in a vessel or pipe that is
completely full, a temperature rise can cause an effect called ___________
_________.
Sulfur stick and pH or litmus paper
What are the two primary ways of finding small ammonia leaks?
15
Fill in the blank: An operator must flush the body or eyes for a minimum of __
minutes when exposed to ammonia.
heat transfer in BTUs per time
What is tonnage?
PSIA
What pressure scale must be used to calculate a compression ratio?
3 groups (CFCs, HCFCs, HFCs)
RETA CARO
RETA CARO Exam Review Set Graded A 2026
10,000 PPM
1% concentration of Ammonia is equal to what in PPM?
11.6
Ammonia is what on a PH scale?
100, 24
Fill in the blanks: More than _____ pounds released of ammonia in _____ hours is
a reportable release.
Thermal burns, dehydration burns, respiratory damage, and chemical burns.
What are the four primary types of injury that can occur due to exposure to
ammonia?
50
What is the Permissible Exposure Limit (PEL) set forth by Federal OSHA for
ammonia in PPM?
full faced air purifying respirator (APR)
Fill in the blank: The PEL tells an operator that they must put on a ____-_____ ___
_________ __________ if they want to stay in that atmosphere.
300
What is the IDLH (immediately dangerous to life and health) set forth by Federal
OSHA for ammonia in PPM?
15
What is the LEL (lower explosive limit) for ammonia in percentage?
150,000
What is the LEL (lower explosive limit) for ammonia in PPM?
28
RETA CARO
, RETA CARO
What is the UEL (upper explosive limit) for ammonia in percentage?
280,000
What is the UEL (upper explosive limit) for ammonia in PPM?
Health 3, Flammability 1, Reactivity 0
What is the NFPA diamond for ammonia outdoors?
Health 3, Flammability 3, Reactivity 0
What is the NFPA diamond for ammonia in an enclosed space?
Blue, red, yellow
What colors correspond on the NFPA diamond for ammonia to health,
flammability, and reactivity?
No
Can an operator wear contact lenses at work?
Hydrostatic expansion
Fill in the blank: When liquid ammonia is trapped in a vessel or pipe that is
completely full, a temperature rise can cause an effect called ___________
_________.
Sulfur stick and pH or litmus paper
What are the two primary ways of finding small ammonia leaks?
15
Fill in the blank: An operator must flush the body or eyes for a minimum of __
minutes when exposed to ammonia.
heat transfer in BTUs per time
What is tonnage?
PSIA
What pressure scale must be used to calculate a compression ratio?
3 groups (CFCs, HCFCs, HFCs)
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