Page 1 of 114
First Class Stationary Air Conditioning – 636-LA
Contractor Exam Questions & Answers
VERIFIED SOLUTIONS LATEST UPDATE THIS
YEAR
First Class Stationary Air Conditioning – 636-LA Contractor Exam
Exam Overview
The 636-LA First Class Stationary Air Conditioning exam is administered by the International
Code Council (ICC) and is required for stationary engineer licensing in New Orleans and
throughout Louisiana . This is an advanced-level exam for professionals working on large-scale
commercial and industrial systems.
Exam Detail Information
Exam Code 636-LA
Administering Body ICC
Format Multiple choice
Passing Score 70%
Reference ICC exam outline, New Orleans stationary engineer requirements
Exam Coverage Summary
Based on the official ICC exam outline and verified exam materials, this exam covers :
• Heating & Cooling Fundamentals: Thermodynamics, psychrometrics, sensible/latent
heat, First and Second Laws, heat transfer, load calculations
• Refrigeration Cycle: Compressors, condensers, evaporators, expansion devices,
refrigerant properties, superheat/subcooling
• Large Commercial Systems: Centrifugal chillers, absorption chillers (LiBr), cooling
towers, water-cooled condensers, purge units
,Page 2 of 114
• Refrigerants: Properties, safety classifications (ASHRAE), EPA Section 608, retrofitting,
ozone depletion, global warming potential
• Air Distribution & Controls: Duct design, DDC/pneumatic controls, zone dampers,
airflow measurement
• Electrical & Controls: Motors, starters, contactors, capacitors, relays, safety devices,
wiring diagrams, phase rotation
• System Operations: Chiller operation, approach temperature, coefficient of
performance (COP), troubleshooting
• Codes & Safety: Louisiana contractor regulations, OSHA, EPA Section 608, confined
space, fire safety
PRACTICE QUESTIONS
Domain 1: Heating & Cooling Fundamentals
1. According to the First Law of Thermodynamics, the net heat added to a closed system
equals the change in which property?
A) Entropy
B) Internal energy
C) Pressure
D) Volume
Answer: B) The First Law states ΔU = Q – W; for a closed system with no work, the net heat
added equals the change in internal energy .
,Page 3 of 114
2. Sensible heat in an air-conditioning system is best described as:
A) Heat absorbed during a phase change
B) Heat that changes the temperature of air without altering its moisture content
C) Heat removed by latent cooling coils
D) Heat generated by electrical components
Answer: B) Sensible heat changes the dry-bulb temperature of the air while moisture content
remains constant; latent heat involves phase change .
3. The SEER rating of an air-conditioning unit measures:
A) Seasonal Energy Efficiency Ratio – cooling output per watt-hour over a typical cooling season
B) Standard Energy Efficiency Ratio – a single-point measurement at 95°F outdoor
C) Specific Energy Emission Ratio – a measure of greenhouse gas output
D) System Energy Evaluation Rate – a maintenance metric
Answer: A) SEER is a seasonal average efficiency metric for cooling performance .
, Page 4 of 114
4. When the pressure in a refrigerant circuit is increased, the boiling point of the refrigerant
will:
A) Decrease
B) Remain unchanged
C) Increase
D) Drop to absolute zero
Answer: C) As pressure increases, the boiling point of a refrigerant rises proportionally .
Domain 2: Refrigeration Systems & Large Commercial Equipment
5. For large commercial air conditioning systems, the refrigerant commonly used in low-
pressure centrifugal chillers is:
A) R-410A
B) R-134a
First Class Stationary Air Conditioning – 636-LA
Contractor Exam Questions & Answers
VERIFIED SOLUTIONS LATEST UPDATE THIS
YEAR
First Class Stationary Air Conditioning – 636-LA Contractor Exam
Exam Overview
The 636-LA First Class Stationary Air Conditioning exam is administered by the International
Code Council (ICC) and is required for stationary engineer licensing in New Orleans and
throughout Louisiana . This is an advanced-level exam for professionals working on large-scale
commercial and industrial systems.
Exam Detail Information
Exam Code 636-LA
Administering Body ICC
Format Multiple choice
Passing Score 70%
Reference ICC exam outline, New Orleans stationary engineer requirements
Exam Coverage Summary
Based on the official ICC exam outline and verified exam materials, this exam covers :
• Heating & Cooling Fundamentals: Thermodynamics, psychrometrics, sensible/latent
heat, First and Second Laws, heat transfer, load calculations
• Refrigeration Cycle: Compressors, condensers, evaporators, expansion devices,
refrigerant properties, superheat/subcooling
• Large Commercial Systems: Centrifugal chillers, absorption chillers (LiBr), cooling
towers, water-cooled condensers, purge units
,Page 2 of 114
• Refrigerants: Properties, safety classifications (ASHRAE), EPA Section 608, retrofitting,
ozone depletion, global warming potential
• Air Distribution & Controls: Duct design, DDC/pneumatic controls, zone dampers,
airflow measurement
• Electrical & Controls: Motors, starters, contactors, capacitors, relays, safety devices,
wiring diagrams, phase rotation
• System Operations: Chiller operation, approach temperature, coefficient of
performance (COP), troubleshooting
• Codes & Safety: Louisiana contractor regulations, OSHA, EPA Section 608, confined
space, fire safety
PRACTICE QUESTIONS
Domain 1: Heating & Cooling Fundamentals
1. According to the First Law of Thermodynamics, the net heat added to a closed system
equals the change in which property?
A) Entropy
B) Internal energy
C) Pressure
D) Volume
Answer: B) The First Law states ΔU = Q – W; for a closed system with no work, the net heat
added equals the change in internal energy .
,Page 3 of 114
2. Sensible heat in an air-conditioning system is best described as:
A) Heat absorbed during a phase change
B) Heat that changes the temperature of air without altering its moisture content
C) Heat removed by latent cooling coils
D) Heat generated by electrical components
Answer: B) Sensible heat changes the dry-bulb temperature of the air while moisture content
remains constant; latent heat involves phase change .
3. The SEER rating of an air-conditioning unit measures:
A) Seasonal Energy Efficiency Ratio – cooling output per watt-hour over a typical cooling season
B) Standard Energy Efficiency Ratio – a single-point measurement at 95°F outdoor
C) Specific Energy Emission Ratio – a measure of greenhouse gas output
D) System Energy Evaluation Rate – a maintenance metric
Answer: A) SEER is a seasonal average efficiency metric for cooling performance .
, Page 4 of 114
4. When the pressure in a refrigerant circuit is increased, the boiling point of the refrigerant
will:
A) Decrease
B) Remain unchanged
C) Increase
D) Drop to absolute zero
Answer: C) As pressure increases, the boiling point of a refrigerant rises proportionally .
Domain 2: Refrigeration Systems & Large Commercial Equipment
5. For large commercial air conditioning systems, the refrigerant commonly used in low-
pressure centrifugal chillers is:
A) R-410A
B) R-134a
