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Question 1. Which of the following best describes when a building permit is required for installing a new gas-fired furnace? A) Only when the furnace is larger than 80,000 BTU/hr B) Whenever the furnace replaces an existing unit, regardless of size C) When the installation involves new gas piping or a change in appliance rating D) Only for commercial buildings Answer: C Explanation: A permit is required whenever new gas piping is run or the appliance rating changes, as this impacts safety and code compliance.
Question 2. What is the primary purpose of a final inspection after HVAC equipment installation? A) To verify that the contractor was paid in full B) To ensure the system operates within design specifications and meets code requirements C) To test the durability of the equipment over a year D) To assess the aesthetic appearance of the installed units Answer: B Explanation: The final inspection confirms that the installation complies with the design and applicable codes, ensuring safe and efficient operation.
Question 3. According to general regulations, which marking must be permanently attached to a commercial boiler for equipment identification? A) Manufacturer’s warranty sticker B) A unique serial number plate containing capacity and fuel type C) A temporary tag indicating installation date D) A colored label showing the contractor’s name
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Answer: B Explanation: Equipment identification requires a permanent plate with the serial number, capacity, and fuel type for traceability and compliance.
Question 4. What clearance is required in front of a gas-fired furnace to allow proper service access? A) 12 inches minimum B) 18 inches minimum C) 24 inches minimum D) No clearance needed if the furnace has a hinged door Answer: C Explanation: A minimum of 24 inches of clear space in front of the furnace is required for safe service and maintenance.
Question 5. Which periodic test is mandated for safety controls on a gas-fired heating system? A) Annual flame sensor verification B) Quarterly thermostat calibration only C) Monthly water pressure check D) Bi-annual refrigerant charge verification Answer: A Explanation: Safety controls such as flame sensors must be tested at least annually to ensure they will shut off gas flow if flame is lost.
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Answer: C Explanation: Electric wall furnaces draw significant power and must be on a dedicated 240 V circuit to avoid overload.
Question 9. When connecting a condensing unit to an evaporative coil, the refrigerant piping must be supported at least every: A) 3 ft B) 6 ft C) 9 ft D) 12 ft Answer: B Explanation: The code requires refrigerant piping to be supported at intervals not exceeding 6 ft to prevent sagging and stress.
Question 10. What is the minimum slope required for a condensate drain line from a cooling coil to ensure proper drainage? A) 0.5 % B) 1 % C) 2 % D) 5 % Answer: B Explanation: A 1 % slope (1/8 in per foot) is the minimum to allow gravity flow of condensate.
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Question 11. A secondary condensate pan is required when the primary drain line is: A) Larger than 3 inches in diameter B) Located above the roof C) Not protected from backflow or blockage D) Made of copper Answer: C Explanation: A secondary pan provides backup protection if the primary drain becomes clogged or backs up.
Question 12. In a hydronic heating system, the purpose of an expansion tank is to: A) Increase water temperature B) Absorb water volume changes due to temperature fluctuations C) Filter debris from the circuit D) Provide a secondary heat source Answer: B Explanation: Expansion tanks accommodate the increased water volume when heated, preventing pressure spikes.
Question 13. When sizing hydronic piping, which factor is NOT considered in the calculation? A) Desired water flow rate (GPM) B) Pipe material thermal conductivity C) System pressure loss limits D) Length of the longest run
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Question 16. For a high-efficiency furnace using PVC venting, the maximum allowable vent length from the appliance to termination is: A) 30 ft B) 45 ft C) 65 ft D) 85 ft Answer: C Explanation: High-efficiency units with PVC venting are typically limited to 65 ft total length to maintain proper draft.
Question 17. What is the minimum clearance between a Type B vent termination and a nearby window opening? A) 6 inches B) 12 inches C) 24 inches D) 36 inches Answer: C Explanation: A 24-inch clearance prevents exhaust gases from re-entering through the window.
Question 18. When installing a Type L vent system, the vent connector must be sized to accommodate a minimum of: A) 1 in. diameter pipe B) 2 in. diameter pipe C) 3 in. diameter pipe D) 4 in. diameter pipe
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Answer: B Explanation: Type L venting requires a minimum 2-inch vent connector to ensure adequate flow.
Question 19. A draft hood for a gas boiler must be installed at what distance above the vent outlet? A) Directly on the vent outlet B) 1 inch above the outlet C) 2 inches above the outlet D) 4 inches above the outlet Answer: C Explanation: The draft hood must be positioned at least 2 inches above the vent outlet to provide proper draft measurement.
Question 20. Which duct material is prohibited for use in a fire-rated shaft without additional protection? A) Galvanized steel B) Aluminum C) Fibrous glass duct board D) Rigid PVC Answer: D Explanation: Rigid PVC is not allowed in fire-rated shafts unless protected because it can melt and release toxic gases.
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Answer: B Explanation: Using duct design charts, 800 CFM at 0.5 in. wg typically matches a 12 × 12 in. rectangular duct.
Question 24. The recommended supply-to-return air ratio for a residential forced-air system is: A) 1: B) 1:0. C) 1:1. D) 1:1. Answer: A Explanation: A balanced 1:1 supply-to-return ratio promotes proper airflow and system efficiency.
Question 25. What R-value is required for duct insulation located in an unconditioned attic according to most codes? A) R- 2 B) R- 4 C) R- 6 D) R- 8 Answer: C Explanation: Ducts in unconditioned spaces generally require at least R- 6 insulation to reduce heat loss or gain.
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Question 26. Which type of damper is specifically designed to limit fire spread through ductwork? A) Volume damper B) Fire-damper C) Smoke-damper D) Balancing damper Answer: B Explanation: Fire-dampers close automatically when exposed to high temperatures, preventing fire propagation.
Question 27. A register with a built-in adjustable grille is considered a: A) Diffuser B) Grille C) Volume control device D) Supply air terminal Answer: D Explanation: It serves as a supply air terminal allowing airflow adjustment at the outlet.
Question 28. Which gas piping material is prohibited for use in residential installations due to corrosion concerns? A) Black steel pipe B) Corrugated stainless steel tubing (CSST) C) Rigid copper pipe D) PEX-rated gas pipe Answer: D
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B) Every 4 ft C) Every 6 ft D) Every 10 ft Answer: C Explanation: Black steel pipe must be supported at intervals not exceeding 6 ft to prevent sagging.
Question 32. Where must a shut-off valve be installed on a branch gas line serving an appliance? A) At the appliance inlet only B) At the main service line only C) At the appliance inlet and at the branch line’s entry point to the appliance room D) No shut-off valve is required on branch lines Answer: C Explanation: Code requires a shut-off valve at the appliance and a separate valve where the branch enters the appliance room for safety.
Question 33. The minimum burial depth for a non-pressurized underground gas pipe in a residential driveway is: A) 6 inches B) 12 inches C) 18 inches D) 24 inches Answer: B
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Explanation: A minimum of 12 inches burial protects the pipe from damage and meets most code requirements.
Question 34. During a pressure test of a new gas piping system, the test pressure must be at least: A) 1.5 times the design pressure, not less than 30 psig B) 2 times the design pressure, not less than 50 psig C) 3 times the design pressure, not less than 100 psig D) Equal to the design pressure Answer: B Explanation: The test pressure must be at least twice the design pressure, but not less than 50 psig, to ensure integrity.
Question 35. Which of the following is a required component of a whole-house mechanical ventilation system? A) A dedicated exhaust fan in each bathroom B) An outdoor air intake with a minimum opening of 1 sq ft per 1,000 sq ft of floor area C) A heat recovery ventilator (HRV) in all climates D) A carbon monoxide detector in the attic Answer: B Explanation: Whole-house ventilation must provide an outdoor intake sized to 1 sq ft per 1,000 sq ft of conditioned space.
Question 36. The maximum allowable length for a kitchen range hood exhaust duct to a roof termination is:
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Explanation: When exhaust terminates into an attic, a backdraft damper is required to prevent conditioned air from entering.
Question 39. In a hazardous exhaust application for a garage, the duct material must be: A) Any metal duct that is properly sealed B) Rigid PVC only C) Galvanized steel with a fire-rated coating D) Flexible aluminum Answer: C Explanation: Hazardous exhaust (e.g., gasoline vapors) must use galvanized steel with a fire-rated coating to resist corrosion and fire.
Question 40. Which disconnect requirement applies to a 240 V, 30 A furnace? A) A single-pole breaker located within 5 ft of the unit B) A double-pole breaker sized to 125 % of the furnace’s full-load current C) A fused disconnect located in the attic only D) No disconnect is required if the furnace is hard-wired Answer: B Explanation: The disconnect must be a double-pole breaker sized to at least 125 % of the full-load current for safety.
Question 41. A low-voltage thermostat wiring system must be protected by: A) A dedicated 15 A breaker
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B) A fused disconnect rated at 2 A C) A ground-fault circuit interrupter (GFCI) D) No protection is required because the voltage is low Answer: B Explanation: Low-voltage thermostat circuits require a fused disconnect (commonly 2 A) to protect the wiring.
Question 42. The high-limit safety switch on a furnace is designed to: A) Shut off the blower when airflow is insufficient B) Open the gas valve if water temperature exceeds a set point C) Close the gas valve if combustion temperature exceeds a safe limit D) Activate the emergency lighting system Answer: C Explanation: The high-limit switch monitors furnace temperature and closes the gas valve if it exceeds a safe threshold.
Question 43. A pressure-relief valve on a hot-water boiler is typically set to open at: A) 30 psi above normal operating pressure B) 50 psi above normal operating pressure C) 75 psi above normal operating pressure D) 100 psi above normal operating pressure Answer: B Explanation: Pressure-relief valves are commonly set to open at 50 psi above the normal operating pressure to protect the system.
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C) Central air conditioner D) Natural-gas dryer Answer: D Explanation: Gas-powered dryers must have automatic shut-off valves to stop gas flow in case of over-temperature or flameout.
Question 47. When installing a gas-fired boiler in a basement, the minimum clearance to the nearest combustible wall is: A) 2 inches B) 4 inches C) 6 inches D) 12 inches Answer: C Explanation: A 6-inch clearance protects surrounding combustible materials from heat.
Question 48. Which of the following is a required test for a newly installed gas water heater? A) Leak test at 150 psi for 10 minutes B) Combustion analysis for CO levels C) Electrical continuity test of the heating element D) Sound level measurement Answer: B Explanation: Combustion analysis ensures the water heater is burning cleanly and within CO limits.
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Question 49. The minimum size for a vent connector on a 50,000 BTU/hr gas furnace using a Type B vent is: A) 1 in. diameter B) 2 in. diameter C) 3 in. diameter D) 4 in. diameter Answer: B Explanation: Type B venting requires a minimum 2-inch connector for a furnace of this size.
Question 50. A plastic vent pipe (PVC) may be used for a high-efficiency furnace only if: A) The furnace is located in a residential building B) The vent length does not exceed 100 ft C) The pipe is rated for the temperature and pressure of the exhaust gases D) The pipe is installed inside a metal chase Answer: C Explanation: PVC can be used only when it is specifically rated for the exhaust temperature and pressure.
Question 51. When designing a duct system for a commercial office, the recommended maximum velocity for supply ducts is: A) 500 ft/min B) 800 ft/min C) 1,200 ft/min
