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ADTC HVAC FINAL EXAM WITH
VERIFIED ANSWERS FOR A
GUARANTEED PASS
What does the "Buddy System" in HVAC work involve? Monitoring the location and safety of coworkers Use lifting aids such as ratcheting chain and cable hoists Reviewing ladder safety information from the Werner Ladder Company Implementing Lockout/Tagout (LOTO) procedures Monitoring the location and safety of coworkers How does an HVAC technician encountering various chemicals and substances use Safety Data Sheets (SDS)? To identify the tools and equipment required for a specific task To evaluate the cost of materials used in HVAC installations To determine the energy efficiency of HVAC systems To understand the potential hazards and safety precautions associated with chemicals To understand the potential hazards and safety precautions associated with chemicals
What is the ideal temperature range for human comfort in HVAC systems? 40-45°C (104-113°F) 15-20°C (59-68°F) 32-37°C (89.6-98.6°F) 22-27°C (71.6-80.6°F) 22-27°C (71.6-80.6°F) Which of the following career fields fall within the HVAC specialty? Select all that apply. Building Inspector Trainer/Instructor Energy Auditor Which of the following is a type of potential energy? Electrical Thermal Radiant Mechanical Electrical
A local company has a 4-ton HVAC system. Calculate the total British Thermal Units per hour (BTU/hr) for this system. 42,000 BTU/hr 60,000 BTU/hr 36,000 BTU/hr 48,000 BTU/hr 48,000 BTU/hr Which of the following materials allow the flow of energy (electricity) to power electric motors and controls? Insulator Filter Conductor Refrigerant Conductor Which type of current is commonly found in batteries, starters, and HVAC controls? Oscillating Current (OC) Variable Current (VC) Alternating Current (AC) Direct Current (DC)
Direct Current (DC) In HVAC systems, which current powers heavier loads, such as fans and refrigerant compressors? Direct Current (DC) Oscillating Current (OC) Variable Current (VC) Alternating Current (AC) Alternating Current (AC) Alex is designing an electrical circuit for a new HVAC system. Which of the following two items should Alex select if he needs the most suitable conductors and insulators based on their properties and suitability for conducting or resisting the flow of electrical current? He should choose copper as a conductor and plastic as an insulator. He should choose glass as a conductor and aluminum as an insulator. He should choose aluminum as a conductor and copper as an insulator. He should choose rubber as a conductor and copper as an insulator. He should choose copper as a conductor and plastic as an insulator. Which of the following best describes the role of insulation in an electrical circuit? To provide a pathway for current flow
Increased efficiency Decreased conductivity Equipment failure Identify the three components of Ohm's Law. Voltage, current, and resistance Amps, resistance, and current Watts, voltage, and current Voltage, watts, and amps Voltage, current, and resistance Which electrical component in the HVAC system is an effective example of how movement creates a magnetic field around the conductor? Transformer Capacitor Control board Thermostat Transformer Which of the following applications utilize electricity to generate magnetic fields? Select all that apply. Electric motors
Transformers Generators Mariah is installing or repairing an electrical circuit. Which steps should she take to prevent corrosion-related issues? Select all that apply. Use corrosion-resistant materials and coatings Use appropriate insulation Use antioxidant compounds Dana connected a multimeter while troubleshooting a 12VDC power source, registering a reading of -12VDC. Identify the potential causes behind this unexpected voltage reading. Select all that apply. Incorrect polarity connection of leads to the battery terminals Incorrect polarity connection of leads to the multimeter Why is using a driver with an integral fixed tip in certain work locations recommended? To sharpen the driver tip To enable the removal of tube-style fittings To prevent the driver from falling out To cut thin sheet metal To prevent the driver from falling out
An HVAC technician needs to cut thin sheet metal during a repair task. Select the appropriate tool and reasoning for effectively completing the task. Use a power drill to dress the cutting edge with a grinding stone. Use tinsnips for smooth cuts of straight lines and curves. Use a hacksaw with low TPI to avoid dressing the cutting edge. Use a cold chisel to duplicate the original shape with a grinder. Use tinsnips for smooth cuts of straight lines and curves. Which of the following is considered a safe handling and storage procedure when working with refrigerants? Refrigerants can be vented into the atmosphere. Refrigerants can be stored in any container. Refrigerants should be stored in a non-climate-controlled area. Refrigerants should be in a secure, well-ventilated location. Refrigerants should be in a secure, well-ventilated location. What information is provided on the Safety Data Sheets (SDS)? All materials, equipment and components listed, and guidelines for safely using the items All information required for servicing the systems and electrical diagrams of the HVAC equipment
All company information and office procedures as described by the employer or organization All information relating to the installation and maintenance of the HVAC equipment All materials, equipment and components listed, and guidelines for safely using the items Farik is at a worksite to install HVAC equipment. Which of the following would he use to clean, resurface, shape and cut metals, plastic, wood or concrete? Abrasives Adhesives Solvents Aerosol cleaners Abrasives Which PPE item is most commonly used when working on HVAC equipment? Lanyard and tool tether Breathing protection Eye protection Safety harness Eye Protection Which of the following fasteners or fittings is most commonly used in an HVAC system?
To aid bending without brittleness To increase material hardness To prevent corrosion To aid bending without brittleness Why is it important to use special fittings when joining pipes and tubes of different materials in HVAC systems? To reduce fluid flow within the tubing To increase material hardness To simplify the installation process To eliminate electrolysis and corrosion To eliminate electrolysis and corrosion Which types of plastic are commonly used for water and drain lines in HVAC systems? Select all that apply. Chlorinated Poly Vinyl Chloride (CPVC) Poly Vinyl Chloride (PVC) Acrylonitrile Butadiene Styrene (ABS) Why is pipe thread sealant applied to steel pipe threads when connecting to natural gas plumbing HVAC systems? To increase material hardness
To aid bending without brittleness To prevent corrosion at the connection To achieve a complete seal and prevent leaks To achieve a complete seal and prevent leaks Jordan is assigned the task of rapidly bending a short length of copper tubing back and forth to create work hardening. What challenge might he face and how could this impact the tubing's performance? It could cause increased fluid flow within the tubing, causing water hammer at bends. The tubing may become soft, affecting structural integrity. It could cause improved electrical conductivity of the tubing, necessitating increased sacrificial anodes. The tubing may become brittle, leading to potential leaks. The tubing may become brittle, leading to potential leaks. Refrigerant flammability is... the refrigerant's ability to adapt to pressure and temperature changes. the substance's ability to ignite and burn the ability of a refrigerant to be harmful or lethal with acute or chronic exposure. the refrigerant's ability to transfer heat from one substance to another. the substance's ability to ignite and burn
American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE) U.S. Environmental Protection Agency (EPA) Which phase changes allow refrigerants to release and absorb heat? Vapor to condensation and condensation to vapor Liquid to vapor and vapor to liquid Liquid to condensation and condensation to liquid Liquid to ionization and ionization to liquid Liquid to vapor and vapor to liquid Kenzie must create the ideal refrigerant to reduce the depletion of the earth's atmospheric ozone layer. Which characteristics must the refrigerant have? Select all that apply. Good thermal dynamics Non-flammable Non-corrosive Which organic refrigerant contains carbon, is not flammable, and is classified as an expendable refrigerant? Carbon dioxide (R744) Puron (R410a) Propane (R290)
Ammonia (R717) Carbon dioxide (R744) Refrigerant blends that act like a single refrigerant with fixed boiling and condensing points are called _____. Zeotropes Azeotropes Freezants Inorganic Compounds Azeotropes Identify what the American Society of Heating, Refrigeration, and Air Conditioning Engineers (ASHRAE) Standard 34 categorizes. It categorizes refrigerants and their attributes of toxicity and flammability. It categorizes refrigerants and the attributes of boiling points and pressures. It categorizes refrigerants and the attributes of operating temperatures and pressures. It categorizes refrigerants and the attributes of sensible heat and latent heat. It categorizes refrigerants and their attributes of toxicity and flammability. In refrigeration systems requiring lubricants, when should the lubricants be added? After refrigerant charging Before refrigerant charging
Thermal change Gas transformation Phase Change What happens to pressure as a piston slides toward the closed end of a cylinder within a refrigeration compressor? The pressure increases. The pressure stays the same. The pressure changes to a vacuum. The pressure decreases. The pressure increases Gretchen is inspecting fire extinguishers in a room where the temperature is 77°F. How will the pressure inside the cylinders likely change if she starts the job later in the day when the room temperature is 40°F or 100°F? Pressure will increase at 40°F and decrease at 100°F. The pressure will decrease at 40°F and increase at 100°F. The pressure will decrease at 40°F and 100°F. The pressure will increase at 40°F and 100°F. The pressure will decrease at 40°F and increase at 100°F.
What causes the cooling effect in refrigeration and air conditioning systems? Select all that apply. Air Exchange Refrigerant state Pressure change A vendor assisting in installing a new system requests the temperature in Celsius. If the current temperature is 77°F, what is the temperature in Celsius? 37°C 32°C 25°C 27°C 25°C Which organization publishes regulations for refrigerant cylinders for storage, disposal, and recovery to ensure public safety? Air Conditioning Contractors of America (ACCA) Refrigeration Service Engineers Society (RSES) Department of Transportation (DOT) American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE) Department of Transportation (DOT)
