Page 1 of 167
New Mexico Journeyman Refrigeration JR Exam
Actual Test Questions and Correct Answers With
Rationales LATEST THIS YEAR
New Mexico (NM) JR Journeyman Refrigeration Practice Exam (continued)—BONUS TEST –ACTUAL
EXAM WITH QUESTION 1-200 IS AFTER THIS
Question 84. What is the typical state of the refrigerant at the outlet of the condenser?
A) Low-pressure liquid
B) High-pressure liquid
C) Low-pressure vapor
D) High-pressure vapor
Answer: B
Explanation: The function of the condenser is to reject heat, causing the refrigerant to condense from a
high-pressure vapor into a high-pressure liquid .
Question 85. In a refrigeration system, which component creates a pressure drop that causes the
refrigerant to cool rapidly?
A) Compressor
B) Condenser
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C) Expansion device
D) Evaporator
Answer: C
Explanation: The expansion device (TXV, capillary tube, or orifice) causes a sudden drop in pressure,
which correspondingly drops the temperature of the refrigerant (Joule-Thomson effect) .
Question 86. R-410A is classified as which type of refrigerant?
A) CFC
B) HCFC
C) HFC
D) HFO
Answer: C
Explanation: R-410A is a hydrofluorocarbon (HFC) blend (R-32 and R-125). It has zero Ozone Depletion
Potential (ODP) but a high Global Warming Potential (GWP) .
Question 87. What is the primary purpose of an accumulator in a refrigeration system?
A) Store liquid refrigerant for peak loads
B) Prevent liquid refrigerant from entering the compressor
C) Filter debris from the oil
D) Increase the subcooling of the liquid line
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Answer: B
Explanation: The accumulator is installed on the suction line between the evaporator and the
compressor to trap any liquid refrigerant "floodback," ensuring only vapor returns to the compressor to
prevent damage.
Question 88. According to the New Mexico Mechanical Code, what is the minimum required spacing for
pipe hangers on a 1-inch copper refrigerant line?
A) 4 feet
B) 6 feet
C) 8 feet
D) 10 feet
Answer: B
Explanation: The NM Mechanical Code dictates specific hanger spacing based on pipe size. For 1-inch
copper piping, the maximum spacing is generally 6 feet .
Question 89. Which of the following refrigerants is considered "A1" under ASHRAE Standard 34?
A) R-290 (Propane)
B) R-600a (Isobutane)
C) R-134a
D) R-717 (Ammonia)
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Answer: C
Explanation: ASHRAE Standard 34 classifications: "A" denotes low toxicity, "1" denotes no flame
propagation. R-134a is A1 (non-toxic and non-flammable). R-290 is A3 (highly flammable) .
Question 90. The primary purpose of a purge unit on a low-pressure chiller (R-123) is to remove:
A) Refrigerant oil
B) Water
C) Non-condensables (air)
D) Acid
Answer: C
Explanation: Low-pressure chillers operate below atmospheric pressure, making them prone to air
leakage. Non-condensables (air) collect in the condenser, raising head pressure. The purge unit extracts
this air.
Question 91. If a three-phase compressor is rotating backwards, what is the most likely symptom?
A) Normal amp draw but no cooling
B) Extremely high amp draw and loud noise
C) Low amp draw and no pressure differential
D) Continuous operation of the crankcase heater
New Mexico Journeyman Refrigeration JR Exam
Actual Test Questions and Correct Answers With
Rationales LATEST THIS YEAR
New Mexico (NM) JR Journeyman Refrigeration Practice Exam (continued)—BONUS TEST –ACTUAL
EXAM WITH QUESTION 1-200 IS AFTER THIS
Question 84. What is the typical state of the refrigerant at the outlet of the condenser?
A) Low-pressure liquid
B) High-pressure liquid
C) Low-pressure vapor
D) High-pressure vapor
Answer: B
Explanation: The function of the condenser is to reject heat, causing the refrigerant to condense from a
high-pressure vapor into a high-pressure liquid .
Question 85. In a refrigeration system, which component creates a pressure drop that causes the
refrigerant to cool rapidly?
A) Compressor
B) Condenser
, Page 2 of 167
C) Expansion device
D) Evaporator
Answer: C
Explanation: The expansion device (TXV, capillary tube, or orifice) causes a sudden drop in pressure,
which correspondingly drops the temperature of the refrigerant (Joule-Thomson effect) .
Question 86. R-410A is classified as which type of refrigerant?
A) CFC
B) HCFC
C) HFC
D) HFO
Answer: C
Explanation: R-410A is a hydrofluorocarbon (HFC) blend (R-32 and R-125). It has zero Ozone Depletion
Potential (ODP) but a high Global Warming Potential (GWP) .
Question 87. What is the primary purpose of an accumulator in a refrigeration system?
A) Store liquid refrigerant for peak loads
B) Prevent liquid refrigerant from entering the compressor
C) Filter debris from the oil
D) Increase the subcooling of the liquid line
, Page 3 of 167
Answer: B
Explanation: The accumulator is installed on the suction line between the evaporator and the
compressor to trap any liquid refrigerant "floodback," ensuring only vapor returns to the compressor to
prevent damage.
Question 88. According to the New Mexico Mechanical Code, what is the minimum required spacing for
pipe hangers on a 1-inch copper refrigerant line?
A) 4 feet
B) 6 feet
C) 8 feet
D) 10 feet
Answer: B
Explanation: The NM Mechanical Code dictates specific hanger spacing based on pipe size. For 1-inch
copper piping, the maximum spacing is generally 6 feet .
Question 89. Which of the following refrigerants is considered "A1" under ASHRAE Standard 34?
A) R-290 (Propane)
B) R-600a (Isobutane)
C) R-134a
D) R-717 (Ammonia)
, Page 4 of 167
Answer: C
Explanation: ASHRAE Standard 34 classifications: "A" denotes low toxicity, "1" denotes no flame
propagation. R-134a is A1 (non-toxic and non-flammable). R-290 is A3 (highly flammable) .
Question 90. The primary purpose of a purge unit on a low-pressure chiller (R-123) is to remove:
A) Refrigerant oil
B) Water
C) Non-condensables (air)
D) Acid
Answer: C
Explanation: Low-pressure chillers operate below atmospheric pressure, making them prone to air
leakage. Non-condensables (air) collect in the condenser, raising head pressure. The purge unit extracts
this air.
Question 91. If a three-phase compressor is rotating backwards, what is the most likely symptom?
A) Normal amp draw but no cooling
B) Extremely high amp draw and loud noise
C) Low amp draw and no pressure differential
D) Continuous operation of the crankcase heater
