Kentucky HVAC Journeyman Practice Exam

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• The maximum air temperature within nonmetallic ducts shall not exceed what temperature?
• The ventilation rate required for repair garages for natural and hydrogen fueled vehicles is specified in cubic feet per minute per how many cubic feet of room volume?
• What is the required distance for exhaust outlets and ducts dischargeing explosive or flammable vapors to be from property lines?
• What are the safety requirements for working with refrigerants?
• What is the recommended method for vacuuming a refrigerant system?
• What safety device is used to prevent excess pressure in a refrigeration system?
• What type of vent must oil-burning appliances be listed and labeled for venting with?
• What is a function of the thermostat in an HVAC system?
• How often should HVAC air filters typically be replaced?
• Air intake openings should be located a minimum of how many feet from lot lines or buildings on the same lot?
• How high must mechanical draft system vents terminate above any forced air inlet located within 10 feet?
• What is the minimum slope required for underground ducts to facilitate drainage?
• How can HVAC systems contribute to energy savings in a home?
• For flooded lead acid and other types of batteries, the ventilation system must limit hydrogen concentration to what percentage of the total volume of the room?
• In ducts with an installed damper, a smoke detector must be placed within how many feet of the damper?
• What is the primary function of a variable speed blower motor in an HVAC system?
• In HVAC, what do "latent heats" refer to?
• Ducts operating at temperatures above what limit need sufficient thermal insulation to limit surface temperature?
• What term describes the pressure difference created by a vent or chimney due to height and temperature differences?
• What is the main function of a thermostat in an HVAC system?
• Chimney connectors for low-heat appliances must use sheet steel pipe with a diameter of 7 inches and a minimum thickness of what gauge for galvanized steel?
• At what pressure does a steam-heating boiler operate when not exceeding this threshold?
• What type of system uses a furnace and an air conditioner in conjunction?
• What are the typical materials used for ductwork in residential systems?
• What is a typical method for insulating ductwork?
• Ozone cabinets and ozone gas-generator rooms for systems with a maximum ozone generating capacity of 1/2 pound or more shall be mechanically ventilated at a rate of not less than how many air changes per hour?
• What is the minimum mechanical ventilation rate required per square foot of floor area over a storage area?
• What percentage of nominal thickness is assumed for duct insulation to determine R-value?
• Liquids with flash points between 100°F and 140°F are classified as what type of combustible liquid?
• What is the significance of the Return Air Duct?
• The operating temperature of a fire damper actuating device shall be approximately how many degrees above the normal temperature within the duct system?
• Masonry chimney flues must have a cleanout opening with a minimum height of what dimension?
• Fire dampers are not required at penetrations of shafts where the penetrations are in parking garage exhaust or supply shafts that are separated from other building shafts by not less than how many hours of fire-resistance-rated construction?
• Venting systems shall be designed and constructed so as to develop a ______ flow adequate to convey all combustion products to the outside atmosphere.
• What is the minimum pitch required for connectors rising vertically to a chimney or vent?
• Class B Refrigerants must have toxicity at concentrations below what level based on TLV-TWA data?
• What technology can be used to improve indoor air quality in HVAC systems?
• To properly connect to a chimney flue, at what minimum height must connectors be positioned above the lowest portion of the flue?
• Which of the following describes the maximum allowed flue area for a solid-fuel-burning appliance?
• What is the minimum continuous ventilation rate required for battery storage rooms?
• In which area should the inlet to an exhaust system be located?
• The operating temperature of a fire damper actuating device is typically how much above the normal temperature in the duct system?
• How does humidity affect the effectiveness of an air conditioning system?
• What might cause a thermostat to malfunction in an HVAC system?
• What is the minimum flash point for liquid adhesive coatings used on air filters for air conditioning or heating systems?
• What is required for the proper disposal of refrigerants?
• What does the process of "air balancing" involve in HVAC systems?
• What is the minimum size required for exhaust openings in screens, louvers, and grilles that terminate outdoors?
• How does a programmable thermostat help enhance energy efficiency?
• Commercial kitchen exhaust outlets that terminate above the roof must locate the discharge opening at least how many inches above the roof surface?
• Intake openings shall be located not less than 3 feet below contaminant sources where such sources are located within _____ of the opening.
• What is the minimum distance the breathing zone region must be from the walls or fixed air-conditioning equipment?
• Which of the following is NOT an advantage of using ductless mini-split systems?
• What is a primary benefit of a variable speed blower motor?
• Which type of vents are gas appliances listed and labeled for venting?
• What might indicate that an air conditioning system is underperforming?
• What does "zone control" allow in an HVAC system?
• What is one safety concern when handling refrigerants?
• Ozone gas-generator rooms must be ventilated to achieve how many air changes per hour for safety?
• What is the required clearance to combustible construction for commercial kitchen exhaust equipment serving a Type I hood?
• What is the maximum design temperature for air conveyed in flexible air ducts and connectors?
• What minimum ventilation airflow rate is needed in cubic feet per minute to maintain required conditions in an enclosed parking garage floor area?
• What is the importance of proper refrigerant levels in an AC system?
• Positive mechanical ventilation in limited spraying spaces must provide a minimum of how many complete air changes per hour?
• What is the minimum air velocity required within commercial kitchen grease duct systems serving a Type I hood?
• What is a common issue when installing HVAC systems in historic buildings?
• How does the size of ductwork typically affect airflow in an HVAC system?
• How does a reversing valve function in heat pump systems?
• Which component of an HVAC system is responsible for heat removal in refrigeration?
• What is the minimum vertical height that vents should terminate above the highest connected appliance flue collar?
• What is a key benefit of using a ductless mini-split HVAC system?
• What type of air conditioning system utilizes water to cool the air?
• What are the two types of air conditioning systems commonly used in HVAC?
• What is the minimum clearance for commercial cloth dryer ducts to combustible materials?
• Fire dampers are not required at shaft penetrations if steel exhaust ducts extend vertically at least how many inches?
• What is the minimum thickness of corrosion-resistant steel covering foam plastic insulation?
• Smoke detectors shall be installed in return air systems with a design capacity greater than ______, in the return air duct or plenum upstream of any filters.
• What is the minimum clearance required for chimney and vent connectors to electric and oil incinerators?
• What is the ideal humidity level for indoor air in a residential setting?
• What does the efficiency rating of a heat pump indicate?
• Why is regular maintenance important for HVAC systems?
• What type of maintenance is crucial for ensuring HVAC efficiency?
• What is a potential consequence of failing to regularly maintain a heating system?
• What is the temperature limit for air in systems using gypsum boards to form plenums?
• What does "de-superheating" refer to in HVAC systems?
• In order to ensure all welded and brazed joints are liquid tight, what power rating must the lamp used for the light test have at minimum?
• In which scenario is it advisable to use a programmable thermostat?
• Underground commercial kitchen grease ducts must be encased in concrete with a minimum thickness of how many inches?
• What is a common symptom of a refrigerant overcharge?
• What is a key requirement for cleanouts in grease ducts?
• Which tool is commonly used to measure refrigerant pressure in HVAC systems?
• Fuel oil is defined as kerosene or any hydrocarbon oil having a flash point not less than what temperature?
• What is superheating in the context of refrigeration?
• What is the minimum temperature rating for gasket and sealing materials used for duct to exhaust fan connections?
• What is the primary function of an air filter in an HVAC system?
• As per Department of Transportation (DOT) specification, cylinders with a maximum water capacity of _____ shall be used for completely self-contained hand torches and similar applications.
• What is the minimum height that the vertical termination of mechanical draft systems must be above walkways?
• What type of gas is typically used in natural gas heating systems?
• What is the primary purpose of an HVAC filter?
• What is the typical lifespan of a residential HVAC system?
• The minimum openable area to the outdoors, for naturally ventilated floor areas, should be what percentage of the floor area?
• What type of insulation is required for make-up air ducts installed within 18 inches of a Type I commercial kitchen hood?
• What is the maximum air temperature that can be tolerated in nonmetallic duct work?
• What standard governs the installation of HVAC systems in Kentucky?
• How does the configuration of a building influence HVAC design?
• What environmental issue is commonly associated with traditional refrigerants?
• What does "hybrid heating" refer to in HVAC systems?
• What is a key indicator that a capacitor may be failing in an HVAC system?
• Which of the following is a common refrigerant used in HVAC systems?
• Which is a sign that an HVAC system may be experiencing a refrigerant leak?
• What should be the first step if an air conditioner is icing up?
• How can an HVAC technician effectively measure air duct leakage?
• Low-pressure boilers operate at pressures less than or equal to what for steam?
• Ducts shall be supported with approved hangers at intervals not exceeding _____.
• What type of refrigerant is commonly used in modern HVAC systems?
• How much ventilation is required for mechanical systems in parking garages?
• At what temperature is kerosene classified as fuel oil in terms of flash point?
• What factor is crucial for ensuring safety when operating HVAC systems?
• What is the minimum air flow required for a standard residential HVAC system?
• What are typical indicators of poor indoor air quality?
• Which component is responsible for converting the refrigerant from a gas to a liquid?
• How far must the vent vertical termination for a mechanical draft system be located horizontally from any portion of the roof structure?
• The pressure classification of ducts shall equal or ______ the design pressure of the air distribution in which the ducts are utilized.
• What is the purpose of a heat exchanger in an HVAC system?
• What is the purpose of an expansion valve in an HVAC system?
• What is the primary function of a combustion analyzer in HVAC systems?
• The PVC duct for domestic kitchen cooking appliances equipped with a downdraft exhaust system shall extend not more than how many inches above the indoor concrete floor surface?
• What is the primary function of a thermal expansion valve (TXV) in refrigeration systems?
• Which classification of flammable liquid has a flash point below 73°F (23°C) and a boiling point below 100°F (38°C)?
• What does a hybrid heating system aim to achieve?
• Which of the following is a common refrigerant found in modern HVAC systems?
• What is a common cause of airflow restrictions in duct systems?
• What is the role of an expansion valve in an HVAC system?
• Ferrous fan blades shall only be used for fans located within the ductwork and through which hazardous materials are exhausted.
• What is the minimum ventilation airflow rate required per square foot for enclosed parking garage floor areas?
• Why might older HVAC systems be less energy-efficient than modern ones?
• What indicates a possible refrigerant overcharge in a system?
• What does "BTU" stand for in HVAC terminology?
• What is one of the most common signs that an HVAC system needs maintenance?
• How far horizontally from a smoke damper should a spot-type detector be installed?
• How far must the horizontal termination point for a mechanical draft system be from an interior corner formed by two walls?
• Which term describes refrigerants removed from a system without necessarily testing or processing them?
• What does the abbreviation "SEER" stand for in HVAC terminology?
• What component is responsible for circulating air in a ducted HVAC system?
• For flue serving a solid-fuel-burning appliance, the cross-sectional area must not exceed what multiple of the appliance flue collar?
• The ventilation rate for repair garages for natural and hydrogen fueled vehicles shall be at least how many cubic feet per minute per 12 cubic feet of room volume?
• What does "R-410A" represent in HVAC applications?
• What is the minimum thickness required for a vent connector made of galvanized steel?
• How far should cleanouts be located from changes in direction greater than 45 degrees in horizontal grease ducts?
• What can be a consequence of using dirty air filters in an HVAC system?
• How does an air handler differ from a furnace?
• Where the vent vertical termination is located below an adjacent roof structure, the termination point of the mechanical draft system shall be located at least _____ from such structure.
• What is the minimum horizontal distance that outdoor air intake openings must be located from any contaminant source?
• What is the function of a condensate drain in an HVAC system?
• What is the main purpose of checking temperature differentials in an HVAC system?
• Automatic operation of the system shall not reduce the ventilation airflow rate below how many cfm per square foot of the enclosed parking garage floor area?
• To prevent air recirculation in a swimming pool area, what is the maximum relative humidity permitted?
• What is the fire damper rating required for penetrations into less than 3-hour fire resistance rated assemblies?
• In an HVAC system, what is the role of the expansion valve?
• What is the purpose of venting in furnace systems?
• Should manual dampers be installed in connectors for solid fuel-burning appliances?
• What phenomenon occurs if an HVAC system is oversized?
• Cloth dryer exhaust ducts need to be supported at what maximum intervals?
• What is the standard for the installed duct insulation thickness used for determining thermal resistance?
• When might a ducted HVAC system be preferred over a ductless system?
• When is it necessary to perform a refrigerant leak test?
• What is the main purpose of a heat exchanger in HVAC systems?
• What is the required distance that exhaust outlets and ducts must be located from property lines?
• The fire damper rating is particularly important for what type of assembly?
• Which type of insulation material is commonly used for ductwork?
• The maximum horizontal length of a single-wall connector shall be ______ of the height of the chimney or vent.
• What is a common troubleshooting method for assessing HVAC system efficiency?
• Smoke dampers are not required in corridor penetrations if the duct is made of steel of what minimum thickness?
• How can extreme weather affect HVAC system performance?
• The termination of chimneys or vents of mechanical draft systems equipped with power exhausters shall be located a minimum of ______ from the lot line or from adjacent buildings.
• What is the maximum input rating in Btuh gas for an individual modular boiler?
• What is one effect of using a dirty evaporator coil?
• What is the typical lifespan of an HVAC system?
• What is the purpose of a refrigerant changeover valve?
• How often should HVAC filters be replaced or cleaned?
• What performance issue can indicate problems with airflow in an HVAC system?
• The mechanical draft system vent shall vertically terminate at least how many feet below window or gravity air inlet for the building?
• What action should be taken if an HVAC system is short cycling?
• What is one common maintenance task for HVAC systems?
• Which of the following can be a sign of duct leakage in an HVAC system?
• When should an HVAC technician perform a smoke test?
• When is an HVAC system's performance deemed optimal?
• What equipment is essential for measuring the temperature and pressure in an HVAC system?
• What is the effect of a malfunctioning blower motor on HVAC system performance?
• The insulation on externally insulated ducts used for cooling should be covered with a vapor retarder that has a maximum permeance of what value?