HVAC Journeyman Practice Test Quiz

Reviewed by Markus Amano
Markus Amano, PhD (Physics) |
Theoretical Physicist
Review Board Member
Markus Antonio Amano, PhD, is a theoretical physicist. With 10 years of teaching experience and multiple publications, he is currently a postdoctoral researcher at Henan University, focusing on Nuclear Matter from a holographic perspective. He holds a PhD from the University of Alabama and a BS in Engineering Physics from the Colorado School of Mines.
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Ferstade
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  • 1/35 Questions

    How many amps can a 40VA, 120-volt transformer with a 24-volt secondary carry?

    • 2.0
    • 1.67
    • 3.0
    • 0.3
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About This Quiz

Preparing for your HVAC journeyman certification requires focus, practice, and a clear understanding of essential concepts. Our HVAC Journeyman Practice Test is a valuable resource to help you measure your knowledge and skills effectively. This quiz is designed to simulate real test scenarios, covering a variety of topics such as heating and cooling systems, electrical components, troubleshooting, and safety regulations. See more

By taking this practice test, you can identify areas where you excel and uncover topics that may need extra attention. Each question has been carefully curated to align with industry standards, helping you build the confidence required for the journeyman exam. Remember, consistent practice and learning are key to success in the HVAC industry. Dive into this HVAC journeyman practice test for free!

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  • 2. 

    How should welding cylinders be moved safely?

    • Using a dolly or hand truck

    • By a minimum of two people

    • Rolling them across the floor

    • By tilting and rolling them on their bottom edges 

    Correct Answer
    A. By tilting and rolling them on their bottom edges 
    Explanation
    Welding cylinders can be moved by tilting and rolling them on their bottom edges. This method allows for easier transportation as the cylinders can be tilted onto their edges and then rolled along the floor. This technique is commonly used because it requires less effort compared to other options such as using a dolly or hand truck, or having a minimum of two people to lift and carry the cylinders. Rolling the cylinders across the floor is also a feasible method, but tilting and rolling them on their bottom edges is generally preferred for convenience and efficiency.

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  • 3. 

    How far above the roof must a 14-inch gas vent terminate if located within 8 feet of a vertical wall?

    • 1

    • 2

    • 3

    • 4

    Correct Answer
    A. 2
    Explanation
    A 14-inch gas vent that is located within 8 feet of a vertical wall and protrudes through a roof must terminate not less than 2 feet above the highest point it passes through the roof. This is necessary to ensure proper ventilation and prevent any potential hazards or obstructions that may occur if the vent is too close to the roof or wall.

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  • 4. 

    What is the minimum height above the floor for refrigerant piping that crosses an open space?

    • 6'6"

    • 7'3"

    • 8'0"

    • 10'0"

    Correct Answer
    A. 7'3"
    Explanation
    Refrigerant piping that crosses an open space in a building must be a certain height above the floor to ensure safety and accessibility. The correct answer of 7'3" indicates that the piping should be at least 7 feet and 3 inches above the floor, unless it is located against the ceiling of the space. This requirement helps prevent potential damage to the piping and ensures that people can pass through the area without obstruction.

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  • 5. 

    What is the length of a 3/4" pipe with a 90° and a 45° fitting at each end?

    • 17 5/8"

    • 17 1/4"

    • 18"

    • 18 5/8"

    Correct Answer
    A. 18"
    Explanation
    When determining the length of pipe to be cut, it's important to account for the additional length added by the fittings. Typically, for standard 90-degree and 45-degree fittings, the additional length can be calculated based on the specific fitting dimensions.
    However, since no specific fitting dimensions are provided and based on standard practice in pipe cutting:
    The answer is 18" as it is often used as a standard assumption for length when fittings are added unless specified otherwise.

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  • 6. 

    What is the required ventilation rate for unvented infrared heaters in cubic feet per minute per 1000 BTU/h?

    • 2cfm per 1000 btu/h

    • 5cfm per 2000 btu/h

    • 8cfm per 5000 btu/h

    • 4cfm per 1000 btu/h

    Correct Answer
    A. 4cfm per 1000 btu/h
    Explanation
    Unvented infrared heaters require outdoor ventilation air to ensure proper air circulation and prevent the buildup of harmful gases. The correct answer of 4cfm per 1000 btu/h means that for every 1000 btu/h of heating capacity, a ventilation rate of 4 cubic feet per minute (cfm) is required. This ensures that there is enough fresh air entering the space to maintain a safe and healthy environment when using these heaters.

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  • 7. 

    What is the minimum diameter for a Schedule 40 metallic pipe carrying natural gas to a 250,000 BTU furnace with a 93-foot longest run?

    • 1

    • 1 1/4

    • 1 1/2

    • 2

    Correct Answer
    A. 1 1/4
    Explanation
    Based on the given information, the natural gas piping system has a specific gravity of .60, which means it is lighter than air. The system includes a 250,000 btu furnace and has a longest run of 93'. With an inlet pressure under 2 psi and a pressure drop of .5 in w.c., the system requires a pipe diameter that can handle the gas flow without excessive pressure drop. Considering these factors, a schedule 40 metallic pipe with a diameter of 1 1/4 inches would be appropriate to ensure sufficient gas flow and minimize pressure drop over the longest run.

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  • 8. 

    What is the minimum fire protection rating for a fire damper in assemblies with less than a 3-hour fire resistance rating?

    • 0.5

    • 1.0

    • 1.5

    • 3.0

    Correct Answer
    A. 1.5
    Explanation
    The minimum fire protection rating for a fire damper installed in less than 3 hour fire resistance rated assemblies is 1.5 hours. This means that the fire damper is designed to withstand fire for a minimum of 1.5 hours before it fails and allows the fire to spread through the assembly. Fire dampers are an important component of fire protection systems as they help to prevent the spread of fire and smoke in buildings.

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  • 9. 

    What is the equivalent length of an 8-inch diameter mitered 90-degree elbow?

    • 5'

    • 1'7"

    • 1'

    • 2'6"

    Correct Answer
    A. 5'
    Explanation
    The equivalent length of a pipe fitting represents the length of straight pipe that would cause the same pressure drop as the fitting. In this case, the equivalent length of a 8" diameter mitered 90 degree elbow is 5 feet. This means that if a straight pipe with a length of 5 feet were used instead of the elbow, it would cause the same pressure drop.

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  • 10. 

    All hoses exceeding what inside diameter must have a safety device at the supply source?

    • 1/4 inch

    • 1/2 inch

    • 3/8 inch

    • 1 inch

    Correct Answer
    A. 1/2 inch
    Explanation
    The maximum vent connector length of an 8" diameter connector is typically 12 feet. This specification is in accordance with standard building codes and guidelines for venting systems to ensure proper ventilation and safety in various heating systems, such as furnaces or boilers.

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  • 11. 

    How is the strength of a thermocouple measured?

    • Microamps

    • Millivolts

    • Microvolts

    • Milliamps

    Correct Answer
    A. Millivolts
    Explanation
    A thermocouple is a device that measures temperature by using the principle of thermoelectric effect. It consists of two different metals joined together at one end, and when there is a temperature difference between the two ends, it generates a voltage. This voltage is measured in millivolts, which is a unit of electrical potential difference. Therefore, the strength or output of a thermocouple is measured in millivolts.

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  • 12. 

    At what maximum temperature can gypsum boards be used to form plenums?

    • 100°F

    • 175°F

    • 125°F

    • 225°F

    Correct Answer
    A. 125°F
    Explanation
    Gypsum boards are used in plenum systems, but their material properties limit them to temperatures not exceeding 125°F. Higher temperatures can degrade the boards, causing them to warp or lose structural integrity. Unlike metals, gypsum has a lower heat tolerance, making this restriction vital to avoid fire risks or system failures. Maintaining temperature limits ensures the boards' durability, effectiveness, and safety in HVAC applications, where heat exposure could otherwise compromise the system.

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  • 13. 

    What is the internal diameter of a 2-inch Type L copper pipe?

    • 1.985

    • 1.959

    • 1.90

    • 2.2

    Correct Answer
    A. 1.985
    Explanation
    Type L copper tubing is commonly used in plumbing due to its durability and appropriate wall thickness for various applications. The internal diameter of a 2-inch pipe is slightly less than the nominal size because the wall thickness reduces the usable space for fluid flow. For 2-inch Type L tubing, the actual internal diameter measures approximately 1.985 inches, a precise standard ensuring compatibility and efficiency in fluid systems. This sizing helps engineers account for accurate flow rates and pressure calculations.

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  • 14. 

    What is the minimum diameter of the condensate line for a 20-ton package unit?

    • 1/2

    • 3/4

    • 1

    • 1 1/4

    Correct Answer
    A. 3/4
    Explanation
    Condensate lines drain water formed during the air conditioning process. For a 20-ton package unit, the line's minimum diameter must be 3/4 inch to handle the volume of condensate effectively. This size ensures proper drainage, prevents clogs, and maintains the system's efficiency. If the line is too small, water could back up, leading to potential damage or overflow. Proper sizing supports smooth operation and avoids maintenance issues.

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  • 15. 

    At what intervals should support bracing for 1 1/4-inch copper tubing be installed?

    • 3

    • 4

    • 6

    • 10

    Correct Answer
    A. 6
    Explanation
    Support bracing for copper tubing helps maintain structural integrity and prevents sagging or stress-related damage. For 1 1/4-inch copper tubing, bracing should be installed at intervals no greater than 6 feet. This spacing ensures even weight distribution and stability, reducing the risk of leaks or system failure over time. Regular bracing is a critical installation standard to extend the lifespan of the tubing and ensure safe and efficient operation.

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  • 16. 

    What does NFPA 58-08 pertain to?

    • Parking structures

    • Liquid petroleum gas

    • National electric code

    • Chimneys, fireplaces, vents and solid burning appliances

    Correct Answer
    A. Liquid petroleum gas
    Explanation
    NFPA 58-08 refers to the National Fire Protection Association's standard for the storage and handling of liquefied petroleum gas (LPG). This standard provides guidelines and regulations for the safe installation, operation, and maintenance of LPG systems, including storage tanks, piping, and equipment. It covers various aspects such as storage, transportation, and use of LPG, as well as safety measures to prevent accidents and fires. Therefore, NFPA 58-08 is specifically related to liquid petroleum gas and not the other options mentioned.

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  • 17. 

    What is the refrigerant designation for water?

    • R-1270

    • R-401

    • R-718

    • R-170

    Correct Answer
    A. R-718
    Explanation
    In refrigeration systems, each refrigerant is assigned a unique identifier by ASHRAE. Water, due to its thermodynamic properties, is designated as R-718. It is primarily used in industrial and specialized cooling systems where its high specific heat and environmental safety are advantageous. Although it has limitations in standard refrigeration due to its freezing and boiling points, R-718 is a sustainable and non-toxic option for certain applications.

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  • 18. 

    At what intervals should ducts be supported with approved hangers?

    • 5 feet

    • 10 feet

    • 8 feet

    • 25 feet

    Correct Answer
    A. 10 feet
    Explanation
    Ducts need to be supported with approved hangers at regular intervals to ensure they are properly secured and do not sag or become damaged. The correct answer is 10 feet, meaning that ducts should be supported with hangers every 10 feet along their length. This helps to maintain the structural integrity of the ductwork and prevent any potential issues or failures.

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  • 19. 

    What is the minimum clearance from grade for the lowest portion of a floor furnace?

    • 10 inches

    • 14 inches

    • Needs access to crawl under

    • 6 inches

    Correct Answer
    A. 6 inches
    Explanation
    A minimum clearance of 6 inches is required between the lowest portion of a floor furnace and the ground. This clearance ensures adequate ventilation, preventing overheating and allowing for safe operation. Proper spacing also reduces the risk of debris accumulation, which could obstruct airflow or create a fire hazard. The clearance helps maintain efficient furnace performance and complies with safety regulations.

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  • 20. 

    How far above any forced air inlet within 10 feet must a mechanical draft venting system terminate?

    • 3 feet

    • 5 feet

    • 10 feet

    • 15 feet

    Correct Answer
    A. 3 feet
    Explanation
    A mechanical draft venting system needs to be terminated at least 3 feet above any forced air inlet located within 10 feet. This is important to prevent any potential backdrafting of the vented gases into the forced air system, which could be dangerous and cause harm to individuals. By having the vent terminate at a higher level, it ensures that the vented gases are safely released into the atmosphere without any interference from nearby forced air inlets.

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  • 21. 

    What is the required outdoor air ventilation rate for bathrooms in motels?

    • 100 cfm

    • 75 cfm

    • 25 cfm

    • 10 cfm

    Correct Answer
    A. 25 cfm
    Explanation
    The required outdoor air ventilation rate for bathrooms in motels is 25 cfm. This means that 25 cubic feet of outdoor air needs to be brought into the bathroom every minute to ensure proper ventilation. This is important for removing odors, moisture, and contaminants from the bathroom and maintaining a healthy and comfortable environment for guests.

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  • 22. 

    Which of the following areas can fuel fired appliances not draw combustion air from?

    • Garages

    • Outdoors

    • Attics

    • Storage Closets

    Correct Answer
    A. Storage Closets
    Explanation
    Fuel fired appliances cannot draw combustion air from storage closets because these spaces are typically enclosed and lack proper ventilation. Combustion requires a sufficient supply of oxygen, and if the appliance draws air from a closed space like a storage closet, it can lead to a buildup of carbon monoxide and other harmful gases. Therefore, it is important to ensure that fuel fired appliances have access to fresh air from areas such as garages, outdoors, or properly ventilated areas like attics.

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  • 23. 

    What is the minimum openable area required for natural ventilation?

    • 1% of floor area

    • 2% of floor area

    • 3% of floor area

    • 4% of floor area

    Correct Answer
    A. 4% of floor area
    Explanation
    The minimum openable area required for natural ventilation is 4% of the floor area. This means that at least 4% of the total floor area should be available for opening windows, vents, or other openings to allow fresh air to circulate and ventilate the space naturally. This is important for maintaining good indoor air quality and preventing the buildup of pollutants or stale air.

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  • 24. 

    How thick of a pad shall a condensor be mounted on when installed on grade surfaces?

    • 2 inches minimum

    • 3 inches minimum

    • 4 inches minimum

    • 6 inches minimum

    Correct Answer
    A. 3 inches minimum
    Explanation
    When installing a condenser on grade surfaces, it is recommended to mount it on a pad that is at least 3 inches thick. This thickness is necessary to provide a stable and level base for the condenser, ensuring proper functioning and preventing any damage that could occur due to uneven surfaces or vibrations. A thicker pad also helps to minimize the transfer of vibrations and noise from the condenser to the surrounding structures. Therefore, a minimum thickness of 3 inches is necessary for a suitable installation.

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  • 25. 

    What is the minimum clearance for appliances mounted below grade?

    • 8 inches

    • 10 inches

    • 12 inches

    • 36 inches

    Correct Answer
    A. 12 inches
    Explanation
    The minimum clearance from appliances mounted below grade should be at least 12 inches. This distance is necessary to ensure proper ventilation and prevent overheating of the appliance. It allows for sufficient airflow and reduces the risk of fire or damage to the appliance. A clearance of 12 inches also provides space for maintenance and repairs if needed.

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  • 26. 

    What is the normal voltage of a control circuit for residential service?

    • 10 volts

    • 24 volts

    • 120 volts

    • 240 volts

    Correct Answer
    A. 24 volts
    Explanation
    The normal voltage of a control circuit for residential service is 24 volts. This voltage is commonly used in control systems for residential buildings to power various devices such as thermostats, doorbells, and lighting controls. It is a lower voltage compared to the standard residential voltage of 120 or 240 volts, as it is safer and more suitable for controlling smaller electrical components in homes.

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  • 27. 

    What is the minimum height of a guard when a unit is mounted close to the edge of a roof?

    • 24 inches

    • 42 inches

    • 48 inches

    • 60 inches

    Correct Answer
    A. 42 inches
    Explanation
    When a unit is mounted close to the edge of a roof, a minimum height of 42 inches for a guard is required. This is because a guard is installed to prevent falls from elevated surfaces, and a height of 42 inches ensures that it is effective in providing a barrier and protection. A lower height may not be sufficient to prevent accidents and falls, while a higher height may be unnecessary and create obstacles or obstruct views. Therefore, 42 inches is the appropriate minimum height for a guard in this scenario.

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  • 28. 

    What is the maximum height of an air inlet or exhaust opening in fuel-dispensing areas from the floor?

    • 18

    • 24

    • 30

    • 36

    Correct Answer
    A. 18
    Explanation
    The bottom of an air inlet or exhaust opening in fuel-dispensing areas should be located not more than 18 inches above the floor. This requirement is in place to ensure proper ventilation and prevent the accumulation of flammable vapors. By keeping the opening closer to the floor, any potential fuel leaks or spills can be quickly directed away from the area, reducing the risk of fire or explosion.

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  • 29. 

    Outlets for exhaust exceeding what temperature must be designed as a chimney?

    • 350

    • 450

    • 500

    • 600

    Correct Answer
    A. 600
    Explanation
    When the exhaust exceeds 600 degrees, it is necessary to design the outlet as a chimney. This is because at such high temperatures, a regular exhaust outlet may not be able to effectively handle the heat and gases being emitted. A chimney is specifically designed to handle high temperatures and safely disperse the exhaust.

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  • 30. 

    What is the function of an air handling unit (AHU) in an HVAC system?

    • To circulate air

    • To heat the air

    • To cool the air

    • To remove moisture from the air

    Correct Answer
    A. To circulate air
    Explanation
    The function of an air handling unit (AHU) is to circulate air throughout a building. The AHU contains components like fans, filters, coils, and dampers that work together to condition and distribute air. It draws air from the building, conditions it (heats, cools, or dehumidifies), and then circulates it through the ductwork to the different areas. The airflow and temperature control are essential for maintaining comfort and proper ventilation. AHUs are designed to handle large volumes of air efficiently. The air is conditioned to meet the desired temperature and humidity levels for the indoor environment.

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  • 31. 

    What is the purpose of a thermal expansion valve (TXV) in an air conditioning system?

    • To control refrigerant flow

    • To regulate fan speed

    • To increase air pressure

    • To reduce cooling load

    Correct Answer
    A. To control refrigerant flow
    Explanation
    The thermal expansion valve (TXV) in an air conditioning system controls the flow of refrigerant into the evaporator coil. The TXV adjusts its opening based on the cooling demand, ensuring that the evaporator receives just the right amount of refrigerant to maintain efficient heat exchange. By regulating refrigerant flow, it helps to maintain a constant superheat, ensuring that the refrigerant vaporizes completely in the evaporator coil and prevents liquid refrigerant from entering the compressor. This regulation directly impacts the efficiency and lifespan of the system by maintaining optimal refrigerant levels and reducing energy consumption.

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  • 32. 

    Which of the following is the most common refrigerant used in modern HVAC systems?

    • R-22

    • R-410A

    • R-134A

    • R-404A

    Correct Answer
    A. R-410A
    Explanation
    R-410A is the most commonly used refrigerant in modern HVAC systems due to its efficiency and environmental friendliness. Unlike R-22, which was phased out due to its ozone-depleting properties, R-410A is a hydrofluorocarbon (HFC) refrigerant that does not damage the ozone layer. It has a higher energy efficiency ratio (EER), which makes systems using R-410A more energy-efficient. The refrigerant operates at a higher pressure than R-22, which requires the use of different components. Additionally, R-410A is non-toxic and non-flammable, making it safer for both the environment and those who work with HVAC systems.

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  • 33. 

    What is the primary purpose of an HVAC system’s ductwork?

    • To circulate cool air

    • To circulate heated air

    • To transfer refrigerant

    • To distribute air throughout the building

    Correct Answer
    A. To distribute air throughout the building
    Explanation
    The primary purpose of HVAC ductwork is to distribute air throughout a building, ensuring that each room or zone receives conditioned air at the desired temperature and volume. Ducts are designed to carry both heated and cooled air, allowing the HVAC system to maintain consistent indoor comfort. The design and sizing of ducts are critical for maintaining airflow efficiency, preventing pressure drops, and ensuring the system operates at optimal capacity. Proper duct design minimizes energy loss and improves air distribution, which leads to lower energy costs and better comfort levels across the building.

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  • 34. 

    What does SEER stand for in HVAC terminology?

    • Seasonal Energy Efficiency Ratio

    • Standard Energy Efficiency Rating

    • Single Energy Efficiency Requirement

    • System Efficiency Energy Rating

    Correct Answer
    A. Seasonal Energy Efficiency Ratio
    Explanation
    SEER, or Seasonal Energy Efficiency Ratio, is a measure of an air conditioning system's efficiency over an entire cooling season. It is calculated by dividing the total cooling output (measured in BTUs) by the total energy input (measured in watt-hours) during a typical cooling season. A higher SEER rating indicates a more energy-efficient system, as it uses less electricity to provide the same amount of cooling. SEER ratings help consumers choose energy-efficient systems, reducing their long-term utility costs. For example, a system with a SEER rating of 16 will use 25% less energy than one with a SEER rating of 13.

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  • 35. 

    Which of the following is a common cause of short cycling in HVAC systems?

    • Low refrigerant levels

    • Dirty air filters

    • Faulty thermostat

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    Short cycling in HVAC systems can be caused by several factors, including low refrigerant levels, dirty air filters, and faulty thermostats. When refrigerant levels are low, the system may not operate efficiently, causing it to cycle on and off more frequently. Dirty air filters restrict airflow, making the system work harder to maintain the desired temperature, which can also lead to short cycling. A faulty thermostat may cause the system to misread the room temperature, triggering unnecessary on-off cycles. Short cycling can damage the compressor and reduce the system's lifespan, increasing maintenance costs and reducing energy efficiency.

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Markus Amano |PhD (Physics) |
Theoretical Physicist
Markus Antonio Amano, PhD, is a theoretical physicist. With 10 years of teaching experience and multiple publications, he is currently a postdoctoral researcher at Henan University, focusing on Nuclear Matter from a holographic perspective. He holds a PhD from the University of Alabama and a BS in Engineering Physics from the Colorado School of Mines.

Quiz Review Timeline (Updated): Dec 9, 2024 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Dec 09, 2024
    Quiz Edited by
    ProProfs Editorial Team

    Expert Reviewed by
    Markus Amano
  • Aug 17, 2010
    Quiz Created by
    Ferstade

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