Download Putnam County JOURNEYMAN AIR CONDITIONING (ENGLISH OR SPANISH) Exam and more Exams Technology in PDF only on Docsity!
CONDITIONING (ENGLISH OR SPANISH)
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Question 1. What is the primary purpose of wearing personal protective equipment (PPE) when working on HVAC systems? A) To look professional B) To prevent injury and exposure to hazards C) To speed up the job D) To keep clothes clean Answer: B Explanation: PPE is worn to protect workers from hazards such as sharp edges, electrical shock, and chemical exposure, reducing the risk of injury. Question 2. According to EPA Section 608, which refrigerant type is most harmful to the ozone layer? A) HFC B) CFC C) HCFC D) HFO Answer: B Explanation: Chlorofluorocarbons (CFCs) have the highest ozone depletion potential among the listed options.
CONDITIONING (ENGLISH OR SPANISH)
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Question 3. What is the correct procedure before servicing any electrical component in an HVAC system? A) Disconnect the load only B) Shut off the thermostat C) Lockout and tagout the power supply D) Leave the power on for testing Answer: C Explanation: Lockout/tagout procedures ensure the system is safely de-energized to prevent accidental shock or startup. Question 4. Which code governs mechanical equipment installations in Putnam County, NY? A) National Plumbing Code B) International Mechanical Code (IMC) C) Uniform Building Code D) National Fire Protection Association Code Answer: B Explanation: The International Mechanical Code is referenced by many counties, including Putnam, for HVAC installations.
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A) Remove, Reuse, Replace B) Recover, Recycle, Reclaim C) Reduce, Reuse, Recycle D) Remove, Reclaim, Replace Answer: B Explanation: Recover means to remove, recycle means to clean and reuse, reclaim means to return to a new product specification. Question 8. What is the function of a pressure relief valve on a refrigerant cylinder? A) Prevent leaks B) Maintain cylinder temperature C) Release excess pressure safely D) Allow fast charging Answer: C Explanation: The relief valve prevents the cylinder from rupturing by venting excess internal pressure. Question 9. Which PPE is most important when handling refrigerants? A) Leather gloves
CONDITIONING (ENGLISH OR SPANISH)
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B) Safety glasses and chemical-resistant gloves C) Hard hat D) Steel-toed boots Answer: B Explanation: Refrigerants can cause frostbite and eye injury; gloves and eyewear protect against these hazards. Question 10. What does the Clean Air Act regulate in HVAC work? A) Building insulation B) Use and disposal of refrigerants C) Duct sizing D) Electrical wiring Answer: B Explanation: The Clean Air Act addresses emissions and management of ozone- depleting and high-GWP refrigerants. Question 11. What is the main hazard of mixing different refrigerants in a recovery cylinder? A) Cylinder corrosion B) Inaccurate pressure readings
CONDITIONING (ENGLISH OR SPANISH)
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D) Noise pollution Answer: B Explanation: The Montreal Protocol aims to phase out substances that deplete the ozone layer, such as CFCs and HCFCs. Question 14. What is the function of a ground fault circuit interrupter (GFCI) when servicing HVAC equipment? A) Prevents overcurrent B) Shuts off power during a ground fault C) Reduces voltage D) Increases circuit resistance Answer: B Explanation: GFCIs protect personnel by disconnecting power if a ground fault is detected. Question 15. In ladder safety, what is the recommended ratio of height to base distance for setting up a straight ladder? A) 1: B) 2: C) 4:
CONDITIONING (ENGLISH OR SPANISH)
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D) 6:
Answer: C Explanation: For every 4 feet of ladder height, the base should be 1 foot from the wall. Question 16. What is the primary function of a compressor in the refrigeration cycle? A) Absorb heat B) Raise refrigerant pressure and move it through the system C) Condense refrigerant D) Filter air Answer: B Explanation: The compressor pumps refrigerant and increases its pressure and temperature. Question 17. Which method of heat transfer is primarily responsible for cooling air in an evaporator coil? A) Conduction B) Convection C) Radiation
CONDITIONING (ENGLISH OR SPANISH)
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Answer: B Explanation: HFCs (e.g., R-410A) contain no chlorine and do not deplete ozone. Question 20. What is the correct instrument to use when checking the continuity of an electrical circuit? A) Manifold gauge B) Clamp meter C) Multimeter D) Megohmmeter Answer: C Explanation: A multimeter is used to test continuity, voltage, and resistance in electrical circuits. Question 21. What is the function of a metering device (expansion valve or capillary tube) in HVAC systems? A) To control airflow B) To regulate refrigerant flow into the evaporator C) To increase refrigerant pressure D) To filter refrigerant Answer: B
CONDITIONING (ENGLISH OR SPANISH)
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Explanation: The metering device controls the amount of refrigerant entering the evaporator, ensuring proper cooling. Question 22. What does “superheat” refer to in HVACR? A) Refrigerant temperature below its boiling point B) Air temperature above 90°F C) Temperature of vapor refrigerant above its boiling point D) Excessive heating in a furnace Answer: C Explanation: Superheat is the temperature of vapor refrigerant above its boiling (evaporation) temperature. Question 23. Which of the following is a common cause of low suction pressure in an air conditioning system? A) Dirty air filter B) Overcharge of refrigerant C) Restricted metering device D) High outdoor temperature Answer: C
CONDITIONING (ENGLISH OR SPANISH)
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Explanation: Class C extinguishers are rated for electrical fires. Question 26. What is the primary purpose of a filter-drier in a refrigeration system? A) Increase pressure B) Add moisture C) Remove moisture and contaminants D) Cool refrigerant Answer: C Explanation: Filter-driers remove moisture and particulates to protect the system from corrosion and blockages. Question 27. Which of the following is NOT an acceptable method to join copper refrigerant tubing? A) Soldering B) Brazing C) Compression fitting D) Gluing Answer: D
CONDITIONING (ENGLISH OR SPANISH)
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Explanation: Gluing is not suitable for copper tubing; soldering, brazing, and compression fittings are acceptable. Question 28. What does “latent heat” refer to in the context of air conditioning? A) Heat measured by a thermometer B) Heat required to change a substance’s temperature C) Heat required to change a substance’s state without changing temperature D) Heat lost through ductwork Answer: C Explanation: Latent heat is absorbed or released during a phase change, such as evaporation or condensation. Question 29. The main function of a condenser coil is to: A) Absorb heat from the indoor air B) Release heat to the outside air C) Increase refrigerant pressure D) Filter air Answer: B Explanation: The condenser coil releases absorbed heat to the outdoors, condensing refrigerant from vapor to liquid.
CONDITIONING (ENGLISH OR SPANISH)
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A) Increase temperature B) Reduce humidity C) Add moisture to the air D) Filter air Answer: C Explanation: Humidifiers add moisture to maintain comfortable indoor humidity levels. Question 33. What is a common symptom of an overcharged air conditioning system? A) Low head pressure B) High superheat C) High head pressure D) Low subcooling Answer: C Explanation: Too much refrigerant leads to excessive head pressure and potential compressor damage. Question 34. Which is the proper tool to use when checking for refrigerant leaks? A) Clamp meter
CONDITIONING (ENGLISH OR SPANISH)
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B) Soap bubble solution or electronic leak detector C) Multimeter D) Anemometer Answer: B Explanation: Leak detection is done with electronic detectors or by applying soap solution to suspect joints. Question 35. What is the result of insufficient airflow across an evaporator coil? A) Increased cooling capacity B) Coil icing and reduced efficiency C) High system pressure D) Improved dehumidification Answer: B Explanation: Poor airflow causes the coil to freeze, reducing system efficiency and air delivery. Question 36. When interpreting a wiring diagram, what do solid lines typically represent? A) Optional connections B) Factory wiring
CONDITIONING (ENGLISH OR SPANISH)
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D) Limit switch Answer: C Explanation: The igniter creates the spark or heat needed to light the burner. Question 39. What is the main function of a limit switch in a furnace? A) Start the blower B) Shut off gas if temperature is too high C) Control thermostat D) Control refrigerant flow Answer: B Explanation: The limit switch prevents overheating by shutting down the burner if temperatures exceed safe limits. Question 40. How often should air filters in a residential HVAC system typically be checked or replaced? A) Once a year B) Every 1-3 months C) Every 5 years D) Never
CONDITIONING (ENGLISH OR SPANISH)
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Answer: B Explanation: Filters should be checked every month and replaced every 1- 3 months for optimal performance. Question 41. In a split system air conditioner, where is the evaporator coil located? A) Outdoors B) In the furnace or air handler indoors C) In the condenser unit D) Next to the thermostat Answer: B Explanation: The evaporator coil is installed inside, usually above the furnace or in the air handler. Question 42. What is the purpose of a crankcase heater on a compressor? A) Cool the compressor B) Prevent refrigerant migration and mixing with oil C) Increase refrigerant pressure D) Clean compressor oil Answer: B
