Kansas Mechanical Journeyman Practice Test

These questions are part of the practice quiz. Start practicing

• Which of the following should not be used as a test medium for testing gas piping?
• What does duct sizing depend on in an HVAC system?
• What percentage of a wood stud's depth is allowed to be cut or notched in exterior walls and bearing partitions?
• What is the maximum BTU input rated appliance allowed in a mechanical room measuring 10' x 10' x 8'?
• Which material is mentioned in the qualifications of designing plenums that has temperature limitations?
• At what maximum interval must ducts be supported?
• What is a common feature of smart thermostats?
• Where can plastic (polyethylene) gas piping be installed?
• What can indicate an issue with a split system's indoor coil?
• Where should underground gas piping systems be located relative to other structures?
• What is the maximum number of amps that a 40 VA, 120 V transformer with a 24 V secondary can carry?
• How often should duct cleaning be performed to maintain air quality?
• How should refrigerant be disposed of according to regulations?
• How does a two-stage compressor enhance HVAC efficiency?
• What is the minimum clear vertical height of an attic space required to allow combustion air to be taken from that space?
• What is the minimum specific test pressure (in psig) to be used when testing a natural gas line?
• In what scenario do you select a high-efficiency furnace?
• What is the primary function of a gas valve in heating systems?
• For combustion air provisions, what shape must the ventilation pipe be that is placed in an exterior wall of the furnace enclosure?
• What is the minimum fire protection rating for a fire damper installed in assemblies rated less than 3 hours?
• What factor is critical in ensuring efficient duct design?
• Why is it important to consider a building's insulation during HVAC design?
• What is the refrigerant code name for water?
• What should be monitored during regular HVAC system maintenance?
• When making piping bends in a metallic gas pipe system, the pipe shall not be bent through an arc of more than how many degrees?
• Why is training in leak detection crucial for HVAC technicians?
• Gas piping systems that are to be supplied with gas of a specific gravity of what value or less can be sized directly from the tables provided in the international fuel gas code?
• What does the term 'static pressure' refer to in HVAC ductwork?
• What is a key requirement for the installation of unvented room heaters?
• On a type L appliance vent with a single wall connector clearance of 9", what can the clearance to combustible material be reduced to when using 1/2" thick insulation board over a ventilated air space?
• What should be checked during a routine HVAC system inspection?
• What is the main function of a water heater expansion tank?
• What effect does low refrigerant have on HVAC system efficiency?
• What is the minimum slope required for underground ducts to allow drainage?
• What is the required support spacing for 1 1/4" copper tubing (horizontal)?
• Why is it critical to balance air distribution in an HVAC system?
• What is the role of the air filter in HVAC systems?
• In a natural gas system, what standard should be followed for copper and brass piping?
• How does seasonal maintenance benefit an HVAC system?
• At what flash point is a liquid considered flammable?
• What is one way to enhance the efficiency of an HVAC system?
• What is the purpose of an air handler in an HVAC system?
• In mechanical systems, what does the acronym 'AFUE' mean?
• Why is it essential to establish a regular maintenance schedule for HVAC systems?
• What is the purpose of guards in the context of equipment near roof edges?
• What is the impact of oversizing an HVAC system?
• How many standard round pipes are required to provide combustion air for a 150,000 BTU/h input rated furnace in a confined space?
• What is the minimum wattage of the transformer needed for control circuits totaling 0.8 amps with a secondary voltage of 120V?
• On a natural gas metallic piping system, the unthreaded portion of piping outlets shall extend not less than how many inch(es) through a finished wall?
• Why is maintaining a clean workspace important in mechanical trades?
• In testing a natural gas line to an appliance, what is the minimum test pressure to be used regarding the maximum working pressure?
• According to regulations, what type of standards must copper and brass piping in a natural gas piping system comply with?
• What is an important factor to consider when installing an HVAC system?
• Name a common cause of sediment buildup in water heaters.
• What is an effect of poor insulation in conjunction with an HVAC system?
• Does a mechanical room with appliances rated at 140,000 BTU/h input in dimensions of 10' x 20' x 8' have adequate combustion air?
• What sign indicates that humidifier pads need replacing?
• Why are safety protocols vital when handling refrigerants?
• What might indicate a problem with the ignition system in a furnace?
• What common maintenance task can extend the life of an HVAC system?
• How can regular maintenance optimize air conditioning performance?
• What should technicians do before beginning any HVAC repair work?
• What size copper conductor is required for a branch circuit using type THHW 75C conductor installed in a raceway that contains not more than three current carrying conductors and drawing not more than 30 amps?
• How often should HVAC filters typically be changed?
• What is the approximate gas input rating for a 30 to 40-gallon natural gas-fired water heater?
• Which component is essential for controlling the cooling process in an HVAC system?
• What is the maximum hydrogen sulfide content allowed in natural gas for the use of copper and brass piping?
• What is the danger of a refrigerant leak?
• What type of motors must not be placed inside booths and ducts driving exhaust fans?
• How do you determine the cooling load for a specific room?
• What is the purpose of air balancing in an HVAC system?
• What is the maximum spacing for supporting a gas line indicated in feet?
• True or False: Plastic gas line piping shall be installed outside and underground only.
• For round metal ducts in a single dwelling unit of 16" size, what gauge should they be?
• What does the acronym 'CFM' represent in HVAC terminology?
• How can poor insulation affect HVAC systems?
• What is the formula for calculating BTU (British Thermal Unit)?
• What is the formula represented by Ohm's Law?
• What is the importance of understanding psychrometrics in HVAC?
• What is the maximum temperature for using gypsum board to form plenums?
• What gauge material is required for round metal ducts serving a single dwelling?
• What role do dampers play in duct systems?
• What is the minimum outdoor ventilation air rate required for unvented infrared heaters per 1000 BTU/h?
• When is it essential to replace compressor oil?
• What HVAC component is primarily responsible for generating heat?
• What is the minimum depth at which underground gas piping systems must be buried below grade?
• What is the primary purpose of a mechanical license in Kansas?
• Which tool is used to measure air pressure in ducts?
• What is the purpose of a primary and secondary drain in an HVAC system?
• What is thermal bridging?
• Which type of pipe is commonly used for natural gas in residential installations?
• What impact do dirty air filters have on an HVAC system?
• What is the maximum length for an 8" diameter vent connector?
• What can happen if a system is overcharged with refrigerant?
• At what pressure must vapor pressure not exceed for a liquid to be considered flammable?
• Tests requiring a pressure of 10 pounds per sq. in. or less shall utilize a testing gauge having increments of what psi or less?
• Which factor influences the efficiency of an HVAC system most directly?
• How do variable refrigerant flow systems operate?
• What is one of the main benefits of maintaining a clean air filter in an HVAC system?
• What is the advantage of using a programmable thermostat?
• What does the term 'SEER' stand for?
• What is the primary function of a compressor in an HVAC system?
• What maintenance step should be taken for combustion appliances?
• The register of a floor furnace must have a minimum walking distance width of what measurement on two adjoining sides?
• What is the minimum size cast iron piping that can be utilized for gas piping?
• What is a common indicator of a failing air compressor?
• What is the purpose of the airflow indicator on a ducted system?
• What is the ideal humidity range for a comfortable indoor environment?
• What is the recommended method for cleaning HVAC coils?
• In electrical systems, what does the term 'resistance' refer to?
• What minimum distance should a vent be from a vertical wall according to regulations discussed?
• How often must a one-inch horizontal steel gas pipe be supported, according to regulations?
• What is the size of the round combustion air opening required for gas appliances totaling 350,000 BTU/h using the one opening method?
• In terms of fire safety, what is a crucial requirement for ducts penetrating fire partitions?
• Why is proper ventilation important in residential spaces?
• What is the key benefit of using a programmable thermostat?
• How far must a vent terminate through a 12/12 slope?
• For a natural gas piping system with a 250,000 BTU furnace and a longest run of 93', what is the minimum diameter of schedule 40 metallic pipe required?
• What can result from improperly sized HVAC equipment?
• How can thermographic inspections assist HVAC technicians?
• Which of the following describes a safe practice regarding roof hatch openings?
• What is a benefit of using a heat pump?
• How does external temperature affect the load calculation of an HVAC system?
• Which attribute is most important for an adhesive used in filters?
• What safety device is essential in gas-fired heating systems?
• What is the importance of verifying proper refrigerant charge in HVAC systems?
• What is the primary concern with the location of equipment near roof edges?
• What is the minimum length piping outlet must extend above the floor where extending through a floor slab?
• What role does insulation play in HVAC efficiency?
• Why is it recommended to use a multimeter in electrical troubleshooting?
• What is the significance of following the manufacturer's installation instructions?
• What is the correct term for the pressure at which a gas system must be designed?
• What is a common application of ductless mini-split systems?
• What crucial step follows the installation of a new HVAC system?
• Where should thermostats be placed for the most accurate temperature readings?
• Which of the following can contribute to a system's operational issues over time?
• When might you advise a homeowner to upgrade their HVAC system?
• Why is moisture control crucial in HVAC systems?
• What is the minimum level surface space required in front of an appliance mounted in an attic?
• Why should you verify electrical connections and settings in HVAC units?
• Why are safety glasses necessary when working in mechanical trades?
• What might cause increased noise levels in an HVAC system?
• What percentage of the floor area being naturally ventilated must be openable to the outdoors?
• Which of the following is a common use for a capacitor in electrical circuits?
• What is the required size of openings between a 1344 ft³ mechanical room and a 4800 ft³ mechanical room for a 110,000 BTU/h?
• What factor can lead to premature HVAC system failure?
• Which aspect of a confined space impacts the combustion air requirements for appliances like a furnace?
• True or False: The pressure testing of a natural gas line should never exceed allowable limits.
• What is the accepted refrigerant for modern HVAC systems?
• What does 'ventilation' achieve in indoor environments?
• What is the maximum design operating pressure for a natural gas piping system inside a building?
• What is the purpose of a thermal expansion valve (TXV) in HVAC systems?
• Which of the following features is NOT required for liquid adhesives used on filters?
• What must HVAC technicians understand about building codes?
• What regular action is recommended to ensure optimal air quality?
• Which agency is responsible for regulating mechanical licensing in Kansas?
• What is the required exhaust airflow rate for a barber shop?
• What is the primary purpose of an energy audit in HVAC systems?
• What will happen to the secondary voltage if a 240v transformer is connected to a 208v supply voltage?
• How does a programmable thermostat enhance HVAC efficiency?
• What does the term 'flash point' refer to in HVAC fluids?
• What is the significance of pressure testing gas lines?
• What is the significance of a double-walled vent?
• When should a mechanical journeyman inspect a smoke detector?
• Why is it important to integrate an HVAC solution with building management systems?
• For equipment installed on roofs over how many feet must access be provided by a permanent approved means?
• Why is understanding combustion analysis critical for HVAC technicians?
• How does proper system drainage prevent HVAC problems?
• For an individual outside light or grill, what is the minimum depth below grade for gas piping installation?
• When is it recommended to schedule regular HVAC maintenance?
• What type of vent is listed and labeled for use with wall furnaces?
• Which legislation requires pneumatic tools to be inspected regularly?
• What is a common sign of a failing thermostat?
• What is the minimum flash point required for liquid adhesive coatings used on filters?
• What is a major cause of heat exchanger failure?
• Which of the following is a requirement for a vent connector for certain types of appliances?
• What is the function of regulating the pressure drop in a natural gas system?
• What are the benefits of performing a load calculation before system installation?
• Which equation embodies the laws of thermodynamics related to heat transfer?
• What is the minimum distance a gas vent must terminate above the roof level when located near a vertical wall?
• Why is it crucial for all gas appliances to be vented outside?
• What is the minimum number of years required to become a Kansas Mechanical Journeyman?
• When is it essential to use a vacuum pump during HVAC service?
• What can happen if the HVAC system is oversized for a space?
• What thickness must a steel sleeve lining be for a duct to penetrate a fire partition without needing a fire damper?
• What preventative measure can help prolong compressor life in HVAC systems?
• What is the minimum diameter for the condensate line of a 20-ton package unit?
• True or False: Equipment shutoff valves located in the firebox of a fireplace shall be installed in accordance with the appliance manufacturer's instructions.
• How does soil type specifically affect HVAC geothermal systems?
• Why is condensation drain cleaning important?
• How many days after the filing date is an application for a permit considered abandoned?
• What indicates that fresh air intake is needed in a mechanical system?
• In terms of venting, what is necessary for proper functioning of a fuel gas appliance?
• How can energy recovery ventilators (ERV) benefit an HVAC system?
• What is the minimum clearance from grade for the lowest portion of a floor furnace?
• What should HVAC technicians do if they find low refrigerant levels?
• What must be performed following a refrigerant leak repair?
• When calculating gas pipe sizes, what is the significance of the pressure drop?
• Which of the following is a required characteristic of vent materials used with wall furnaces?
• How deep should underground gas piping be buried to ensure compliance?
• How high must all gas piping installed on top of roofs be elevated off the roof surface?
• What does 'duct leakage' refer to in HVAC contexts?
• What is the purpose of an economizer in an HVAC system?
• What is the maximum flow capacity for the transfer medium in a hydronic system, considering safety?
• For a gas vent protruding through a roof and located within 8 feet of a vertical wall, what is the minimum required height above the highest point it passes through the roof?
• What does a desiccant do in air conditioning?
• What should be done if an HVAC system is making unusual noises?
• What is the minimum height above the floor refrigerant piping must be when crossing an open space?
• What type of system typically includes both heating and cooling components?
• What formula is used to calculate the area of a round pipe?
• Which standard regulates electrical wiring, controls, and connections to equipment and appliances?
• According to UL standards, what is the minimum temperature at which medium heat appliance flue gases must comply with UL 959?
• What common household item can be an indicator of humidity problems?
• If a 20 mfd capacitor and a 40 mfd capacitor are installed in parallel, what is the total capacitance?
• What is the benefit of utilizing digital pressure gauges in HVAC?
• What is the minimum flash point of a transfer fluid in a hydronic piping system above the maximum system operating pressure?
• What safety measure is crucial when working with pressurized systems?
• What is the minimum unobstructed width required for passageways around all sides of boilers?
• When are guards required regarding appliances, equipment, or components located near the roof edge?
• What do you do if you suspect a gas leak?
• What is the minimum depth at which underground gas piping must be installed below grade?
• What is the maximum input rating for unvented room heaters?
• What factor is essential when selecting a furnace for a home?
• What is the primary goal of preventive maintenance in HVAC systems?
• What is the function of an expansion tank in plumbing?
• Is oxygen an approved medium for pressure testing a gas line?
• What is a common effect of excessive humidity in indoor environments?
• How many pounds must lifelines be secured to support from an anchorage?
• Mechanical draft vents must terminate a minimum of how many feet above a public walkway?
• NFP 58-08 is primarily concerned with what type of gas?
• The inside radius of a bend in a fuel gas metallic piping system must not be less than what multiple of the outside diameter of the pipe?
• What is the maximum vertical distance between hangers on a 2" steel gas pipe?
• What unit is used to determine the volume of natural gas provided based on appliance ratings?
• How is airflow measured in HVAC systems?
• What occurs if the proper combustion air is not supplied to a 150,000 BTU/h rated furnace?
• For two mechanical rooms with a combined volume needing combustion air for 110,000 BTU/h, can they have sufficient air if one room is 12' x 14' x 8' and the other is 30' x 20' x 8'?
• Why is it important to calibrate HVAC controls?
• What can indicate that a furnace needs repair?
• What does a combustion analyzer measure?
• What is the function of a fan coil unit in a hydronic system?
• Which maintenance step is vital for the longevity of a heat pump?
• What can cause short cycling in an HVAC system?
• What does 'R-value' measure in insulation?
• Which standard must fire dampers comply with for testing requirements?
• What is a key safety consideration when using unvented infrared heaters?
• Does a fire damper need to be installed if a duct is correctly lined with a steel sleeve?
• What standard is generally required for utilities regarding the burying of underground gas lines?
• What is considered the most efficient type of heating system for cold climates?
• In a compressor, the run winding has what resistance relative to the start winding?
• What is the purpose of a fire damper in HVAC systems?
• A circuit with a supply voltage of 240V and a resistance of 100 ohms will have what amperage reading?
• What is the minimum test pressure used when testing new gas systems?
• Above ground gas piping installed outdoors must be elevated above the grade by at least how many inches?
• How can seasonal factors impact HVAC performance?
• Why is it essential to use a compatible refrigerant for HVAC repairs?
• What is an example of a variable speed fan in HVAC systems?
• Vented wall furnaces must be located such that any door swing does not come closer than how many inches to any air inlet or outlet?
• What is the role of a condensate drain in an HVAC system?
• What does a thermostat do in an HVAC system?
• What is the benefit of using Energy Star-rated appliances?
• Which factor can negatively affect the performance of an HVAC system?
• Where should ducts be supported to ensure compliance with installation standards?
• What is the minimum nominal size for a supply line required for two furnaces rated at 135,000 BTU/h each?
• What type of HVAC system is typically installed on the roof of a building?
• For a furnace with a 120,000 BTU/h input rating, what is the required volume for sufficient combustion air in an ordinarily tight construction building?
• How many square feet of vent area is needed for a barbershop if deemed necessary based on airflow recommendations?
• What could indicate a malfunctioning blower motor?
• What is the operational benefit of zone heating systems?
• What is the function of a backflow preventer?
• What physical property of a refrigerant is essential for its effectiveness?
• What is the primary function of a thermostat in an HVAC system?
• What must technicians check for a safe air conditioning installation?
• What is one requirement for venting gas appliances?
• What is the maximum flame spread and smoke development rating for duct covering insulation in assembly occupancy?
• What is the purpose of duct insulation?
• What happens if the flash point of a liquid adhesive coating is below the required level?
• What does a carbon monoxide detector prevent?
• What does HVAC stand for in mechanical systems?
• What is the role of a gas regulator in heating systems?
• What equipment is used to detect leaks in a refrigeration system?
• For systems with an inlet pressure of less than 2 psi, what supply rate is standard for natural gas?
• What must be included in the installation of all HVAC systems according to Kansas regulations?
• What are the signs of refrigerant problems in an HVAC system?
• Which is a consequence of neglecting to clean the HVAC system regularly?
• Which method is commonly used to check airflow across a coil in HVAC systems?
• What is the importance of thermodynamic principles in HVAC?
• What feature is crucial for the safe installation of lifelines?
• Why is knowledge of local building codes critical for HVAC installation?