Kentucky HVAC Journeyman Practice Exam

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