Page 1 of 108
OK HVAC Journeyman Test ALL 300
QUESTIONS AND CORRECT ANSWERS
LATEST UPDATE THIS YEAR
Oklahoma HVAC Journeyman Exam
FINAL EXAMINATION
Academic Year: 2026–2027
Exam Title: HVAC Journeyman Exam
Content: All Questions, Multiple-Choice Format with Rationales
Edition: Latest Update This Year
EXAMINATION INSTRUCTIONS
This examination evaluates knowledge of HVAC system design, mechanical codes, ventilation,
duct sizing, refrigerant handling, and safety compliance.
Each question has four options (A–D). Choose the best answer.
Rationales are provided to reinforce understanding of correct answers.
Answer all questions based on IMC standards, OSHA requirements, and industry best practices.
EXAM COVERAGE
• Vacuum procedures and refrigerant handling
• Minimum ventilation and exhaust requirements
• Duct sizing and Manual J calculations
• Outdoor ventilation rates for residential buildings
• OSHA safety regulations for power tools
• Sheet metal and pipe gauge requirements
• Refrigerant piping and installation standards
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EXAM QUESTIONS
Question 1 – Deep Vacuum Evacuation
A deep vacuum is an evacuation method in which a technician uses a vacuum pump (or the
system’s compressor) to pull a vacuum until no moisture or other vapor remains in the system.
If the compressor is used for this procedure but cannot produce a deep vacuum, which of the
following is the likely problem?
A) Bad TXV
B) Low refrigerant
C) Leaky suction valve
D) Leaky exhaust valve
Correct Answer:
C) Leaky suction valve
Rationale:
A suction valve leak prevents the system from holding a vacuum, even when the compressor or
vacuum pump is operating properly. TXV and low refrigerant typically affect system operation,
not vacuum performance.
Question 2 – Minimum Ventilation for a Darkroom
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What would be the minimum ventilation exhaust flow rate for a 1,000 Sq-ft darkroom? The
ventilation system must supply the required rate continuously during occupancy.
A) 10,000 CFM
B) 1,000 CFM
C) 180 CFM
D) 120 CFM
Correct Answer:
B) 1,000 CFM
Rationale:
IMC Table 403.3.1.1 lists darkrooms at 1.0 CFM per Sq-ft. Therefore: 1.0 × 1,000 Sq-ft = 1,000
CFM.
Question 3 – Round Steel Duct Size
Use a duct slide rule to determine required round steel duct size for a sheet metal duct system
with:
• Pressure drop: 0.25 IWC
• Airflow: 1,000 CFM
• Total effective length: 263 ft
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• Friction rate: 0.095 IWC/100
A) 12 inch diameter
B) 10 inch diameter
C) 16 inch diameter
D) 14 inch diameter
Correct Answer:
D) 14 inch diameter
Rationale:
Using the ACCA Ductulator (duct slide rule): align 0.095 IWC/100 with 1,000 CFM → required
14-inch round duct.
Question 4 – Minimum Outdoor Ventilation for a Residence
What is the minimum required outdoor ventilation rate for a residence with three bedrooms,
bathrooms, one kitchen, and a 133 Sq-ft one-car garage? (Assume continuous exhaust for
kitchen and bathrooms.)
A) 115 CFM
B) 175 CFM
C) 225 CFM
D) 295 CFM
4
OK HVAC Journeyman Test ALL 300
QUESTIONS AND CORRECT ANSWERS
LATEST UPDATE THIS YEAR
Oklahoma HVAC Journeyman Exam
FINAL EXAMINATION
Academic Year: 2026–2027
Exam Title: HVAC Journeyman Exam
Content: All Questions, Multiple-Choice Format with Rationales
Edition: Latest Update This Year
EXAMINATION INSTRUCTIONS
This examination evaluates knowledge of HVAC system design, mechanical codes, ventilation,
duct sizing, refrigerant handling, and safety compliance.
Each question has four options (A–D). Choose the best answer.
Rationales are provided to reinforce understanding of correct answers.
Answer all questions based on IMC standards, OSHA requirements, and industry best practices.
EXAM COVERAGE
• Vacuum procedures and refrigerant handling
• Minimum ventilation and exhaust requirements
• Duct sizing and Manual J calculations
• Outdoor ventilation rates for residential buildings
• OSHA safety regulations for power tools
• Sheet metal and pipe gauge requirements
• Refrigerant piping and installation standards
1
, Page 2 of 108
EXAM QUESTIONS
Question 1 – Deep Vacuum Evacuation
A deep vacuum is an evacuation method in which a technician uses a vacuum pump (or the
system’s compressor) to pull a vacuum until no moisture or other vapor remains in the system.
If the compressor is used for this procedure but cannot produce a deep vacuum, which of the
following is the likely problem?
A) Bad TXV
B) Low refrigerant
C) Leaky suction valve
D) Leaky exhaust valve
Correct Answer:
C) Leaky suction valve
Rationale:
A suction valve leak prevents the system from holding a vacuum, even when the compressor or
vacuum pump is operating properly. TXV and low refrigerant typically affect system operation,
not vacuum performance.
Question 2 – Minimum Ventilation for a Darkroom
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, Page 3 of 108
What would be the minimum ventilation exhaust flow rate for a 1,000 Sq-ft darkroom? The
ventilation system must supply the required rate continuously during occupancy.
A) 10,000 CFM
B) 1,000 CFM
C) 180 CFM
D) 120 CFM
Correct Answer:
B) 1,000 CFM
Rationale:
IMC Table 403.3.1.1 lists darkrooms at 1.0 CFM per Sq-ft. Therefore: 1.0 × 1,000 Sq-ft = 1,000
CFM.
Question 3 – Round Steel Duct Size
Use a duct slide rule to determine required round steel duct size for a sheet metal duct system
with:
• Pressure drop: 0.25 IWC
• Airflow: 1,000 CFM
• Total effective length: 263 ft
3
, Page 4 of 108
• Friction rate: 0.095 IWC/100
A) 12 inch diameter
B) 10 inch diameter
C) 16 inch diameter
D) 14 inch diameter
Correct Answer:
D) 14 inch diameter
Rationale:
Using the ACCA Ductulator (duct slide rule): align 0.095 IWC/100 with 1,000 CFM → required
14-inch round duct.
Question 4 – Minimum Outdoor Ventilation for a Residence
What is the minimum required outdoor ventilation rate for a residence with three bedrooms,
bathrooms, one kitchen, and a 133 Sq-ft one-car garage? (Assume continuous exhaust for
kitchen and bathrooms.)
A) 115 CFM
B) 175 CFM
C) 225 CFM
D) 295 CFM
4
