South Carolina Ammonia Refrigeration
Technician Certification License Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. Anhydrous ammonia used in industrial refrigeration systems is
classified under OSHA as a:
A. Flammable liquid
B. Corrosive gas
C. Oxidizing agent
D. Non-toxic inert gas
Corrosive gas is the OSHA classification for anhydrous ammonia
because it causes severe irritation and damage to tissues upon
contact.
2. The primary purpose of a refrigerant receiver in an ammonia system is
to:
A. Filter out contaminants
B. Increase suction pressure
C. Store excess liquid ammonia
D. Act as a surge suppressor
A receiver stores excess liquid ammonia to ensure stable operation
and accommodate varying load demands.
,3. What is the OSHA permissible exposure limit (PEL) for ammonia over
an 8-hour work shift?
A. 10 ppm
B. 25 ppm
C. 50 ppm
D. 100 ppm
25 ppm is the established OSHA PEL for ammonia over an 8-hour
time-weighted average to protect worker health.
4. A common method for detecting ammonia leaks in a refrigeration
room is:
A. UV light inspection
B. Using ammonia detection sensors
C. Conductivity testing
D. Pressure decay test
Ammonia sensors detect the presence of ammonia gas and are
standard for leak detection in refrigeration spaces.
5. During normal operation, liquid ammonia is supplied to the evaporator
by the:
A. Compressor
B. Condenser
C. Expansion valve
D. Oil separator
The expansion valve regulates refrigerant flow and provides the
pressure drop needed for liquid ammonia to evaporate.
6. A flooded ammonia system is characterized by having:
A. Superheated refrigerant only
B. Excess liquid refrigerant in the evaporator
C. Low suction pressure
D. Dry expansion only
, Flooded systems maintain a pool of liquid refrigerant in the
evaporator to improve heat transfer.
7. What is the first action an operator should take if an ammonia alarm
sounds?
A. Reset the alarm
B. Evacuate and notify personnel
C. Increase ventilation fans
D. Check system pressures
Personal safety is paramount; evacuating and notifying is the first
step before troubleshooting.
8. In ammonia refrigeration, the primary function of the condenser is to:
A. Absorb heat from the space
B. Store refrigerant
C. Reject heat to the environment
D. Increase suction pressure
The condenser rejects heat absorbed in the system to the surrounding
environment.
9. Pressure-temperature relationship in ammonia indicates that as
pressure increases, the saturation temperature:
A. Decreases
B. Is unaffected
C. Increases
D. Goes to absolute zero
For refrigerants, including ammonia, saturation temperature rises
with increasing pressure.
10. A high-pressure cut-out control protects the system from:
A. Low suction pressure
B. Excessively high discharge pressure
C. Oil return failure
Technician Certification License Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. Anhydrous ammonia used in industrial refrigeration systems is
classified under OSHA as a:
A. Flammable liquid
B. Corrosive gas
C. Oxidizing agent
D. Non-toxic inert gas
Corrosive gas is the OSHA classification for anhydrous ammonia
because it causes severe irritation and damage to tissues upon
contact.
2. The primary purpose of a refrigerant receiver in an ammonia system is
to:
A. Filter out contaminants
B. Increase suction pressure
C. Store excess liquid ammonia
D. Act as a surge suppressor
A receiver stores excess liquid ammonia to ensure stable operation
and accommodate varying load demands.
,3. What is the OSHA permissible exposure limit (PEL) for ammonia over
an 8-hour work shift?
A. 10 ppm
B. 25 ppm
C. 50 ppm
D. 100 ppm
25 ppm is the established OSHA PEL for ammonia over an 8-hour
time-weighted average to protect worker health.
4. A common method for detecting ammonia leaks in a refrigeration
room is:
A. UV light inspection
B. Using ammonia detection sensors
C. Conductivity testing
D. Pressure decay test
Ammonia sensors detect the presence of ammonia gas and are
standard for leak detection in refrigeration spaces.
5. During normal operation, liquid ammonia is supplied to the evaporator
by the:
A. Compressor
B. Condenser
C. Expansion valve
D. Oil separator
The expansion valve regulates refrigerant flow and provides the
pressure drop needed for liquid ammonia to evaporate.
6. A flooded ammonia system is characterized by having:
A. Superheated refrigerant only
B. Excess liquid refrigerant in the evaporator
C. Low suction pressure
D. Dry expansion only
, Flooded systems maintain a pool of liquid refrigerant in the
evaporator to improve heat transfer.
7. What is the first action an operator should take if an ammonia alarm
sounds?
A. Reset the alarm
B. Evacuate and notify personnel
C. Increase ventilation fans
D. Check system pressures
Personal safety is paramount; evacuating and notifying is the first
step before troubleshooting.
8. In ammonia refrigeration, the primary function of the condenser is to:
A. Absorb heat from the space
B. Store refrigerant
C. Reject heat to the environment
D. Increase suction pressure
The condenser rejects heat absorbed in the system to the surrounding
environment.
9. Pressure-temperature relationship in ammonia indicates that as
pressure increases, the saturation temperature:
A. Decreases
B. Is unaffected
C. Increases
D. Goes to absolute zero
For refrigerants, including ammonia, saturation temperature rises
with increasing pressure.
10. A high-pressure cut-out control protects the system from:
A. Low suction pressure
B. Excessively high discharge pressure
C. Oil return failure
