Connecticut (CT) SM-2 Limited Sheet Metal Journeyperson Practice Exam Questions and Answers | 2026 Update | 100% Correct.

1. A print indicates a ductile iron pipe (DIP) penetration through a 2-hour fire-rated concrete floor. The approved firestop system must maintain a rating of at least: A) 1 hour B) 2 hours C) 3 hours D) 4 hours Rationale: B is correct. Firestop systems for penetrations must restore the fire-resistance rating of the assembly being penetrated. Since the floor has a 2-hour rating, the firestop system must be rated for a minimum of 2 hours to maintain the integrity of the fire separation. 2. When installing a continuous roll of flexible duct, what is the maximum allowable sag between supports? A) 0 inches (no sag) B) 1 inch per foot of span C) 1/2 inch per foot of span D) 1 inch per 5 feet of span Rationale: C is correct. Industry standards (SMACNA) specify that flexible duct should be supported at intervals not exceeding 5 feet, and the sag between supports should not exceed ½ inch per foot of the span to prevent air flow restriction and condensate pooling. 3. What is the primary purpose of a "swing joint" in a steam piping system? A) To allow for thermal expansion B) To provide a point for chemical treatment injectionC) To act as a strainer for condensate D) To change the direction of flow without pressure drop Rationale: A is correct. Swing joints, typically comprised of threaded fittings, are used in pipe systems (especially steam and hot water) to absorb the stresses caused by thermal expansion and contraction, preventing pipe failure. 4. A field-riveted seam on a rectangular duct must be sealed. According to SMACNA standards, which sealant method is typically required for a high-pressure duct system (3-4 in. w.g.)? A) Sealant applied only to the inside joint B) Sealant applied only to the outside joint C) Sealant applied to both the inside and outside joint D) No sealant is required if the rivet spacing is less than 4 inches Rationale: C is correct. For high-pressure duct systems, both the internal and external surfaces of transverse and longitudinal seams must be sealed to prevent air leakage and maintain system efficiency and pressure. 5. In Connecticut, the SM-2 license allows a journeyperson to perform sheet metal work for HVAC systems up to what tonnage for air conditioning? A) 10 tons B) 20 tons C) 50 tons D) Unlimited, as long as it is for the SM-2 scope Rationale: C is correct. The Connecticut SM-2 (Limited Sheet Metal Journeyperson) license allows work on HVAC systems, including air conditioning, up to 50 tons of cooling capacity, and heating systems up to 500,000 BTU/hr. 6. Which material is most commonly used for a gasket in a Class 1 (low-pressure) duct system? A) Neoprene spongeB) Closed-cell foam rubber C) Silicone rubber D) Cork Rationale: B is correct. Closed-cell foam rubber is standard for low-pressure duct flanges because it is compressible, resistant to moisture, and provides an adequate seal for pressures up to 2 in. w.g. Neoprene and silicone are used for higher temperatures or pressures. 7. A "reducing tee" is installed in a run of main duct. What is the primary purpose of a turning vane in the fitting? A) To increase the velocity pressure B) To reduce noise and turbulence C) To prevent galvanic corrosion D) To serve as a mounting point for dampers Rationale: B is correct. Turning vanes are installed in square or rectangular elbows and tees to guide airflow smoothly around the turn, reducing turbulence, pressure drop, and noise. 8. OSHA requires that a ladder used for accessing a roof for duct installation must extend at least how many feet above the roof surface? A) 1 foot B) 3 feet C) 5 feet D) 6 feet Rationale: B is correct. OSHA standard 1926.1053(b)(1) requires that ladders used to access an upper landing surface extend at least 3 feet above the surface to provide a stable handhold for dismounting. 9. When brazing copper refrigerant lines, what type of flame is optimal to prevent oxidation inside the pipe?A) Oxidizing flame B) Carburizing flame C) Neutral flame D) Luminous flame Rationale: C is correct. A neutral flame (equal amounts of oxygen and acetylene) is used for brazing copper. It provides the necessary heat without introducing excess oxygen (oxidizing) or carbon (carburizing) which can contaminate the joint or cause scale formation. 10. A blueprints’ architectural scale is ¼" = 1'-0". You measure a duct run on the print as 3 inches. What is the actual length of the duct? A) 3 feet B) 6 feet C) 9 feet D) 12 feet Rationale: D is correct. Since ¼" equals 1 foot, then 1 inch equals 4 feet. 3 inches multiplied by 4 feet/inch equals 12 feet. 11. Which type of duct liner is used primarily for acoustic control in a hospital operating room? A) External wrap insulation B) Internal duct liner with a foil face C) Double-wall duct (duct-within-a-duct) D) Fiberglass board with a perforated metal facing Rationale: D is correct. For critical environments like operating rooms, acoustic lining must be cleanable and non-erosive. Perforated metal-faced fiberglass board (or doublewall duct) is used to prevent fiber erosion into the airstream while providing sound attenuation.12. What is the minimum clearance required from a Type B gas vent to combustible materials? A) 0 inches B) 1 inch C) 2 inches D) 6 inches Rationale: B is correct. Type B gas vents are designed to operate with a 1-inch clearance to combustibles, as per the National Fuel Gas Code (NFPA 54), unless otherwise specified by the manufacturer's listing. 13. When using a plasma cutter, what is the primary safety hazard besides the intense light? A) Risk of electrical shock from the high-frequency generator B) Production of carbon monoxide C) Generation of ozone and metal fumes D) Risk of hydraulic fluid leaks Rationale: C is correct. Plasma cutting generates high temperatures that vaporize metal, producing ozone and metal fumes that require adequate ventilation or respiratory protection. Electrical shock is also a hazard, but fume generation is the primary nonoptical hazard. 14. Which type of solder is prohibited for use on potable water systems in Connecticut? A) 95/5 (Tin/Antimony) B) 50/50 (Tin/Lead) C) 60/40 (Tin/Lead) D) Both B and C Rationale: D is correct. The Safe Drinking Water Act prohibits the use of lead-based solders (any solder with more than 0.2% lead) in potable water systems. 50/50 and 60/40 solders are lead-based.15. The "equivalent length" of a fitting is used to: A) Determine the physical length of the fitting B) Calculate the total friction loss in a duct system C) Determine the weight of the fitting for hanger spacing D) Calculate the volume of air the fitting can handle Rationale: B is correct. Equivalent length is a method used in duct and pipe design to convert the pressure drop caused by a fitting (elbow, tee, etc.) into an additional length of straight duct, allowing for accurate total friction loss calculations. 16. A field-fabricated galvanized steel duct hanger is made from 1" x 1/8" flat bar. According to SMACNA, what is the maximum load this hanger should support? A) 50 lbs B) 100 lbs C) 150 lbs D) 200 lbs Rationale: D is correct. SMACNA standards specify that a 1" x 1/8" steel strap used as a hanger has an allowable load capacity of approximately 200 lbs. Hanger capacity is based on the cross-sectional area and material strength. 17. What is the purpose of a "P-trap" in a condensate drain line? A) To prevent air from being sucked back into the space B) To allow for easy cleaning of the drain line C) To provide a water seal that prevents air from entering the drain pan D) To increase the velocity of the condensate Rationale: C is correct. A P-trap creates a water seal that prevents air from being drawn up through the drain line into the air handler's drain pan, which would disrupt the pressure relationship and could cause condensate to be blown off the coil. 18. A refrigeration system's superheat is measured at the evaporator outlet. An increase in superheat generally indicates:A) An overcharge of refrigerant B) A shortage of refrigerant in the evaporator C) A restriction in the liquid line D) Both B and C Rationale: D is correct. High superheat indicates that the evaporator is not receiving enough liquid refrigerant. This can be caused by an undercharge of refrigerant or a restriction (like a clogged filter drier or TXV) in the liquid line feeding the evaporator.