Arizona R-39/CR-39 Residential and Commercial Air Conditioning and Refrigeration HVAC Contractor Practice Exam

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• What is true about the Ventilation Rate Procedure for an office space?
• What is the required inches of clearance from any combustibles for Type 1 hoods?
• Equipment should not be installed closer than how many feet to a roof's edge?
• Oil burning stoves are tested under which standard?
• How many BTU's are required to produce 1 ton of ice in a day?
• What is the primary goal of ASHRAE Standard 62-1989 regarding ventilation?
• What is a notable characteristic of boiler efficiency?
• Which system is characterized by using air as the primary medium for temperature control?
• What is generally the recommended method for calculating heat load in a residential setting?
• What is the required distance for flammable exhaust from mechanical intakes?
• Which distance is required for explosive or flammable exhaust from exterior walls?
• What unit is used to measure latent heat and the change of state in air conditioning?
• What would 600 square inches convert to in square feet?
• What is a requirement for an exhaust system protecting against non-explosive fumes?
• What does the term 'sensible heat' refer to?
• What is the required clearance when installing equipment in evacuations?
• Duct systems should satisfy fundamental criteria including?
• Are unvented fuel-burning room heaters permitted in building structures for awaiting transportation?
• Electric dryers are tested under which standard?
• What is the minimum height for a plume discharge above an inlet to a building?
• Which of the following systems can mechanical refrigeration be based on?
• How many feet must any intake openings be from lot lines?
• What describes the average pressure drop per hundred feet of duct?
• For what type of application is R-410A primarily used?
• In an air-and-water system, what is the main role of water?
• Which of the following best describes how many degrees a BTU will change when measuring water?
• What must be ensured for a boiler installation in terms of passageways?
• What type of system occurs when an evaporator is in direct contact with the space refrigerated?
• Which safety feature should be installed on a steam or water boiler?
• In refrigeration, what does a ton of ice at 32°F represent in terms of refrigeration capacity?
• At what pressure should ducts be attached to prevent negative air pressure?
• True or False: Units using R-22 need to be replaced as of 2020?
• True or False: Forced draft systems that operate under positive pressure must be gas tight.
• Which system includes air filtering devices?
• What is a common indicator of inadequate ventilation during hydrogen generating operations?
• Total cooling load for HVAC equipment should be determined by which manual?
• Electric boilers must be tested in accordance with which standard?
• What is the minimum pipe size required for multiple unit drains up to 125 tons?
• When installing semi-rigid metallic tubing for a gas furnace, what is the maximum length of the links?
• According to Arizona regulations, can Commercial Air Conditioning Contractors repair space heaters?
• How many BTUs does a ton of nominal cooling roughly equal?
• How does radiant heating primarily transfer heat?
• According to ASHRAE Standard 62-1989, what is the ventilation rate per person recommended for office spaces?
• You should not reuse refrigerant unless tested to what standard?
• What is the CFM calculation for a register with an area of 4.167 square feet and a velocity of 500 FPM?
• An open type expansion tank should have an overflow how many inches from the top of the tank?
• What is the proper approach to measuring humidity in conjunction with temperature?
• Commercial water heaters are tested under which standard?
• What is the purpose of a pressure relief device in HVAC systems?
• True or False: 200 BTU/min is equal to 3.517 kW?
• How far must explosive or flammable exhaust be from obstructions like property lines?
• What type of hoods are specifically used in kitchens for the extraction of greasy and smoky byproducts?
• What is panel heating an example of?
• How does a compressor achieve positive displacement?
• Which component is considered part of the primary system in an HVAC setup?
• What is the maximum surface temperature that allows for the absence of a hood exhaust in certain conditions?
• Is excess air considered combustion air?
• True or False: 3.517 kJ/s is equivalent to 3.517 kW?
• What is a key risk associated with improperly positioned vent intakes?
• What is the minimum distance mechanical intakes must be from any potentially hazardous source?
• Clothes dryer exhaust systems that exceed what CFM must be equipped with make up air?
• What should be checked if an evaporator coil is freezing?
• True or False: It is common to use two layers of insulation material to meet minimum duct liner thickness.
• What is the role of make-up air in relation to clothes dryer exhaust systems?
• Why is it important to maintain clearances around boilers?
• If an area is prone to flooding, how high must intakes be positioned?
• For refrigeration systems, why is it important to use the correct type of copper?
• How many BTUs are required to convert a pound of water at 32 degrees Fahrenheit to a pound of ice?
• In terms of system design, why is it important to maintain proper distances between vents and other equipment?
• What is the significance of using the correct pipe size for multiple unit drains in HVAC systems?
• What gas is widely recognized as the best indicator of Indoor Air Quality (IAQ)?
• Should mechanical ventilation be provided for areas with flammable vapors?
• What is a key difference between open-loop and closed-loop cooling towers?
• In HVAC systems, what is a standard method to account for heat from lighting?
• In HVAC systems, what is the purpose of a heat pipe?
• Examples of residential occupancy include which of the following?
• Which of the following are types of conduit used in air conditioning systems?
• True or False: 1 ton of refrigeration equals 4.713 horsepower?
• True or False: Ducts should be attached to a wall furnace?
• What is the minimum outdoor airflow rate based on?
• A leaky building envelope can lead to which of the following?
• What is the minimum required height for plume discharge above an inlet to a building?
• What do proper refrigerant levels in an air conditioning system provide?
• Are electronic expansion valves more precise than thermal expansion valves?
• Oil fired boilers should be tested according to which standard?
• Which system component is critical for safely monitoring a steam boiler?
• For steam and water piping, a hydrostatic pressure test should be maintained between which PSIG?
• True or False: A system with too little air flow can result in high duct temperatures.
• What typically provides heating to the air in an air-water system?
• True or False: Combustion air ducts can serve more than one unit enclosure.
• Which of the following is true regarding the use of contaminated refrigerant?
• What is an important consideration in sizing an air conditioning unit?
• When installing a steam boiler, what is required for safety?
• What must be ensured on all sides of the boiler?
• In what unit is airflow measured?
• What is the significance of the Annual Fuel Utilization Efficiency (AFUE) rating?
• Which fuel type is most commonly used for residential heating?
• How far must exhaust for explosive fumes be from a property line?
• True or False: Dynamic pressure losses occur due to changes in direction and velocity of airflow.
• Is it true or false that air that is exhausted must not be recirculated?
• What amount of refrigeration does a day ton of refrigeration equal?
• What conversion is necessary when transitioning from square inches to square feet?
• True or False: Radiant heating systems are generally considered less efficient.
• Why must power exhaust for automatic fired equipment be connected in series to each piece of equipment?
• An open type expansion tank should be placed at least how many feet above the highest element?
• How can the concentration of contaminants in indoor air be accurately measured?
• What is the minimum pipe size required for the drain of multiple units together, for 33 tons?
• Refrigerant piping installations with over how many pounds should not have stop valves at the inlet of each receiver?
• Oil fired water heaters are tested under which standard?
• In HVAC, what does the term 'zone control' refer to?
• True or False: A pressure relief device serves a different purpose than a pressure-actuated valve.
• True or False: Reclaimed refrigerant and recovered refrigerant are the same thing.
• Arizona Commercial Air Conditioning Contractors are authorized to handle which type of cooling systems?
• What factor is crucial for assessing the efficiency of an air conditioning system?
• Which type of boiler needs a temperature gauge?
• True or False: Air intake openings that terminate outdoors do not need protection.
• When there is a conflict between general and specific code requirements, which takes precedence?
• What must be true about mechanical intakes in relation to hazardous sources?
• What is the industry standard insulation level when using flex duct?
• Sauna thermostat limit should be set at?
• What does phase voltage measure in a balanced 3 phase system?
• What does the Cooling Coefficient of Performance (COP) measure in a cooling system?
• If a return register measures 20" x 30" and has a velocity of 500 FPM, what is the capacity in CFM?
• What is the primary consideration for determining ventilation rates according to ASHRAE Standard 62-1989?
• What is the characteristic of indirect open-spray refrigeration systems?
• When the heat exchanger is part of a central system, where should shut-off valves be installed?
• What type of occupancy classification applies when a large number of people congregate, making it difficult to vacate quickly?
• What can be a result of improperly vented gas appliances?
• Should machinery rooms be mechanically ventilated to the outdoors?
• What is a critical requirement for designing the airflow rate in HVAC systems?
• True or False: Mechanical ventilation should provide and exhaust roughly the same amount of air.
• At what temperature range can Legionella bacteria grow?
• What standard is the flame spread index measured to?
• When determining the heat gain of a room, which of the following should be considered?
• True or False: A commercial cooking appliance should never be installed in a residence?
• What is the main focus of the Ventilation Rate Procedure in ASHRAE Standard 62-1989?
• During HVAC installation, which document provides guidance for proper system sizing?
• Flex duct should be supported at least every how many feet?
• What is the typical air measurement factor when measuring airflow?
• How often should refrigerants be tested for purity before reuse?
• What is the effect of inadequate duct sizing on an HVAC system?
• You should never use contaminated refrigerant. True or False?
• How far from property lines should mechanical ventilation systems be located?
• What type of conduit is most often used in residential air conditioning installations?
• How many ounces of copper per foot of sheeting does a Type 2 hood require?
• What is the formula to determine CFM when given area and velocity?
• In which condition should mechanical ventilation not be needed?
• What is the function of a runaround loop in HVAC?
• True or False: A fuel-burning appliance can share exhaust with another appliance.
• Copper tubing used for refrigerant should be brazed with which refrigerant groups?
• When installing electrical controls for HVAC, how should a digital multimeter set to voltage be connected?
• What air pressure should a blower cabinet assembly always operate at?
• What is the required combustion air supply from outdoors per 1,000 BTU/h of total input rating?
• What does the wet bulb measurement assess?
• What is the minimum distance for explosive or flammable exhaust from operable openings?
• What is the primary function of a dehumidifier in an HVAC system?
• Flammable vapor is considered to have a dangerous concentration when it exceeds what percentage of its flammable limit?
• What type of air is conveyed from a heat exchanger to an area used for human habitation?
• Which of the following best describes public assembly occupancy?
• What is the first step to calculating the CFM capacity of a return register?
• Which type of system uses zone heat pumps to provide heating and cooling in different areas?
• What does the metering device in a refrigeration system primarily control?
• What is the typical range for allowable duct velocity?
• What does a Type 1 hood require in terms of grease containment?
• Smoke detectors should be installed in return ducts with a design capacity of at least how many CFM?
• What is a critical installation requirement for boilers regarding shutoff valves?
• True or False: Ducts can be attached to a wall furnace.
• At what minimum height must a pressure relief device in a machinery room be terminated above grade level?
• Which component is tasked with increasing thermal comfort by removing humidity from indoor air?
• What role does an air handler play within an HVAC system?
• Which of the following is TRUE regarding the installation of refrigerant piping with positive-displacement compressors?
• What is the standard for oil-fired boiler testing?
• Mechanical ventilation for enclosed parking garages must operate continuously. True or False?
• What is typically eliminated by maintaining proper airflow in HVAC systems?
• Electric ranges are tested under which standard?
• When equipment is located within how many feet must it be governed by the occupancy classification of that building?
• What is the required distance for environmental exhaust from mechanical intake?
• Which types of heating systems can Arizona Commercial Air Conditioning Contractors repair?
• Which of the following is NOT included in the systems Arizona Commercial Air Conditioning Contractors can repair?
• Where should all connections to a mechanical vent be located?
• What is the primary purpose of refrigeration in air conditioning systems?
• What is the purpose of air filtration in HVAC systems?
• Where should a manual shut off valve be installed for fuel burning equipment?
• What is a primary reason to maintain passageways around a boiler?
• Which of the following factors can contribute to heat gain in a building?
• What is the minimum airflow requirement for a ton of air conditioning in CFM?
• When installing radiant panels on wood framing, mechanical fasteners should not be closer than how many inches to the heating element?
• A single circuit must have how many pounds of refrigerant to require a hood exhaust when surface temperatures exceed 800°F?
• A hood exhaust must be provided in a room when what condition is met?
• According to ACCA Manual J, how many BTUs are assigned per person?
• Is using a wall cavity for a return in air conditioning systems acceptable?
• True or False: A ground fault circuit interrupter is used to prevent electrical shock by interrupting current flow.
• What is the main benefit of using a heat recovery system in HVAC?
• What is the minimum distance that vent termination can be located from an interior corner?
• What should be done if a low-pressure hydraulic system is being set up?
• Should a quick-opening blowoff valve be installed in the bottom of a steam boiler?
• What is the primary purpose of a manual shut off valve in fuel burning equipment?
• What is a co-generator HVAC system designed to do?
• What is the flash point benchmark for Class IIIB liquids?
• Where should outdoor air intakes be located for optimal performance?
• What is the minimum distance for exhausting non-explosive fumes from a property line?
• What is a common reason for ensuring adequate clearance when installing HVAC equipment?
• Double-indirect open-spray systems are classified as what probability?
• Can Arizona Commercial Air Conditioning Contractors work on refrigeration systems?
• Which of the following components is identified as part of the secondary system in HVAC?
• When you install a closed-type expansion tank, it should be based on?
• How can CFM's be converted into tons?
• Where should shut-off valves be installed on a boiler?
• True or False: Clothes dryer exhaust systems must be independent from other ventilation systems.
• Per ACCA Manual D, what is the friction rate range that is recommended?
• Frictional pressure in duct systems can be defined using what?
• What is the flash point benchmark for Class IIIA liquids?
• In a private garage, what is the minimum clearance above the floor for installed equipment?
• What is the typical temperature setting for boiler water?
• Under what condition should casing extension boots be installed?
• Sauna thermostat should be located?
• According to ACCA Manual S, furnace size should be within what percent of the peak heating load requirement?
• True or False: Units may be sized in accordance with ACCA Manual S?
• How can measuring air flow at a register help with a ventilation system?
• Why is Indoor Air Quality (IAQ) considered important?
• Which component is crucial to prevent the operation of equipment if power exhaust fails?
• What is the primary function of a heat wheel in HVAC systems?
• Is it true or false that shut-off valves should be installed on connections to each pressure tank?
• What gauge should be installed on a boiler?
• In the process of cooling, total heat is comprised of which two components?
• How many kilowatts are equivalent to 1 ton of refrigeration?
• Should supply fans be positioned near doors?
• Which refrigerant is most commonly used in modern refrigerant systems?
• True or False: Ventilation air can be re-circulated from one dwelling to another.
• Which of the following is a characteristic of non-cyclic refrigeration systems?
• What is the total area of a return register measuring 20 inches by 30 inches?
• What is the primary purpose of installing pressure relief valves in hydraulic piping?
• Should Group B1 refrigerants be used in high-probability systems for human comfort?
• Is it true or false that equipment with over 100 lbs. of refrigerant should have stop valves on each inlet of the liquid receiver?
• Which of the following components may be repaired by Arizona Commercial Air Conditioning Contractors in ventilation systems?
• What is a common result of improper vent installation?
• What is the fundamental difference between grounding and bonding?
• How many BTUs can be assumed to be generated by an occupant?
• When installing equipment in a crawl space, what is the required unobstructed path dimensions?
• What does the term 'direct system' refer to in refrigeration?
• True or False: Grounding and bonding are essentially the same process.
• Which statement about PVC and EMT is correct?
• True or False: EMT conduit is typically made from plastic materials.
• What is the recommended action when determining the placement of air intake openings?
• What should be checked if a ventilation system is not performing effectively?
• True or False: 1 ton of refrigeration is equal to 200 BTU/min?
• At what threshold of refrigerant must equipment be placed in a machinery room?
• What should a duct heating system generally include?
• In HVAC terminology, what does BTU stand for?
• What distance is required for a vent exhausting smoke from a building?
• Where is the inlet side of a mechanical vent connection located?
• Proper duct sizing is covered in which standard publication?
• Which type of HVAC system combines both heating and cooling functions into a single package?
• How far does a guard rail extend from equipment installed within 10 feet of a roof edge?
• When setting up openings for make-up air, what should you ensure?
• A system with too little air flow can lead to what problem?
• In what condition must mechanical ventilation systems for parking garages operate?
• What can impact capacity and lead to evaporator coil freezing according to ACCA Manual D?
• What factor can affect the energy efficiency of HVAC installations significantly?
• What does BTU measure in heating and cooling systems?
• What is the required clearance above a walkway when locating a mechanical draft system?
• What is considered supply air in HVAC terminology?
• What is one method by which chiller systems increase efficiency?
• What is the maximum operating pressure in PSIG for "Wet" systems installed by Arizona Commercial Air Conditioning Contractors?
• Which statement is true regarding grounding fault circuits?
• What is a requirement for hoods used in kitchen ventilation?
• What is the term for any enclosed wiring method used in electrical installations?
• What efficiency metric must furnaces meet according to federal law?
• What can a blocked return cause in an air conditioning system?
• What should piping system components for water systems be sized for?
• What type of copper piping is required for refrigerant piping?
• What is the function of the metering device in refrigeration systems?
• What protection is required for exhaust openings to the outdoors?
• Is line voltage the amount measured between any two line conductors of a balanced 3-phase system?
• When more than 100 persons congregate on levels that are either above or below street level, what occupancy classification is this?
• How many air exchanges per hour should positive mechanical ventilation provide?