Sheet Metal Journeyman Practice Test

These questions are part of the practice quiz. Start practicing

• What device is installed to prevent a back draft occurring in an appliance?
• A Type L vent requires how many inches of clearance to combustibles?
• Which component is primarily monitored by a flame safeguard on a boiler?
• What is the overall objective of pattern development in sheet metal work?
• How would you minimize material waste when cutting multiple parts from a sheet?
• Which standard do Type HT requirements for factory built chimneys in dwellings with solid fuel-burning appliances fall under?
• What is a pilot hole and why is it used before rivet holes?
• Why is edge conditioning important before forming a bend?
• Which of the following is commonly shown as a dimension on a sheet metal pattern drawing?
• A pre-fab double wall vertical vent for a gas furnace is commonly known as which vent type?
• In bending, what does the neutral axis represent?
• What is the area formula for a rectangle?
• Which dimension is commonly seen on a sheet metal pattern drawing?
• For a strap hanger installation at 2.2 m spacing for a 1000 x 1000 mm duct, the hanger size should be which of the following?
• Each spray booth and spray room shall have an independent exhaust duct system discharging to the
• A typical slot diffuser connection to the maximum flex length is how many feet?
• A furnace rated at 60,000 BTUH requires how many square inches of free air?
• What is a burr and why must it be removed?
• Who must approve the location of the gas delivery point in gas installations?
• What is the primary purpose of a flange in sheet metal parts?
• An intake ventilator measuring 14 square feet should be made of ______ ga. material.
• Maximum flame spread distance for combustible electrical wires and cables and optical fiber cables exposed within a plenum is how many feet?
• What is the maximum gas pressure allowed inside a building?
• A pre-fab double wall vertical vent for a gas furnace is called which vent type?
• Which statement best describes the difference between a punched hole and a drilled hole?
• A type B or type L vent shall terminate at least ______ feet in vertical height above the highest connected appliance draft hood or flue collar
• In area-based duct sizing, what is determined from cross-sectional area?
• A wall mounted canopy hood used with a heavy duty cooking appliance shall have a minimum CFM per linear foot of hood of
• The maximum flame spread distance applies to which components when exposed within a plenum?
• Rungs on a ladder SHALL NOT BE more than how many inches apart?
• A health club shower room measuring 10 feet by 10 feet with four shower heads requires an intermittent exhaust capacity of how many CFM?
• The volume of a room compared to the volume of a furnace to be installed is based on what maximum ceiling height?
• Outdoor air openings may be located less than 10 feet horizontally from a street, alley, parking lot or loading dock, provided they are at least how many feet above such locations?
• Why is material grain direction often considered in metal forming?
• Which pipe material cannot be used on the exterior of a building or underground?
• What finishes protect sheet metal in humid environments?
• Which tool is commonly used to check whether a pattern piece is square?
• Which of the following is a correct pairing of common seam types in ductwork?
• What is the BTU rating of a direct vent gas fireplace?
• If gas piping is found to be defective, what must be done?
• At what temperature does duct work need to be insulated?
• Which statement correctly defines pattern development?
• A chimney for a medium-heat appliance shall extend at least how many feet higher than any portion of any building within how many feet?
• Smoke detectors shall be located downstream of an air filter and ahead of any branch connectors in the return air stream with flow greater than how many cfm?
• How do you check a bend angle for accuracy?
• If a 14 square foot intake ventilator is to be constructed, which sheet metal gauge is specified?
• Name two common rivet types used in sheet metal work and a basic use for each.
• Air exhausted from spraying operations shall be permitted to be recirculated as makeup air for unmanned spray operations provided that the vapor concentration is less than ______% of the lower flammable limit
• What minimum passage-way width is required around a boiler?
• Which statement best describes circular take-off and rectangular take-off in ductwork?
• What is the minimum size screw for a duct riser supported from a wall?
• What is the neutral axis concept used for in bending?
• Which gauge is appropriate for a 26 inch round duct with positive pressure and a long seam?
• If kitchen exhaust interferes with appliance operation, which of the following must be provided?
• A duct system having all transverse joints and longitudinal seams sealed is a:
• What is the function of a flange in sheet metal parts?
• Makeup air recirculation for unmanned spray operations is permitted when vapor concentration is less than what percent of LFL?
• Supply and return air ducts in non-hazardous locations shall be supported at intervals of no greater than ______.
• A permit to accomplish work may be extended a MAXIMUM of how many times?
• The relief opening of a draft hood must be kept not less than how many inches from any surface other than the appliance it serves?
• What type of cut is produced by a nibbler that is different from a shear cut?
• What is the primary purpose of a slip joint in ductwork?
• Which of the following statements about finishes is true for humid environments?
• In a shower room scenario, the intermittent exhaust capacity should be what value?
• For rapid assembly with limited access or when disassembly is not required, which rivet type is preferred?
• What is the primary purpose of wearing eye protection and face shields when cutting sheet metal?
• The flame spread distance for wires and cables in a plenum is 5 feet; which of the following is true?
• Air transferred from occupied spaces may serve as makeup air for required exhaust systems in kitchens.
• What is galvanizing?
• A furnace rated at 75,500 BTUH requires how many square inches of free air?
• Testing of a gas line with air, carbon dioxide or which gas?
• How would you lay out a circle of holes on a panel to ensure exact spacing?
• Any variable air volume system duct upstream of the VAV boxes shall meet seal class ______.
• What is a relief near the corner used for in sheet metal patterns?
• At least how many feet of clearance shall be available between the access opening and the edge of the roof?
• The termination point for a duct intended to exhaust flammable vapors shall be located a minimum of how many feet from any property line?
• A listed gas water heater with a draft hood and a single wall metal vent connector needs to have how much clearance to combustible material?
• Which practice best minimizes waste by arranging parts efficiently on the sheet?
• If gas piping is found defective, what action should be taken?
• What is the minimum distance a floor furnace register can be from a wall?
• What can deviations from project drawings cause in ductwork?
• In pattern development, what is the centerline used for?
• How is duct sizing determined in the area method?
• What is the primary advantage of lock seams in ductwork?
• Why would you use a tighter radius on thin sheet metal bends?
• What is a take-off elbow used for in duct routes?
• When an isolation transformer is provided, which safety devices prevent a boiler from operating once the ungrounded side becomes interrupted?
• The purpose of a flame safeguard on a boiler is to:
• What is meant by the neutral axis in bending?
• In hood duct systems, which material should be used?
• For intakes in non-residential occupancies, the maximum screen opening size is which of the following?
• What is bend allowance?
• Longitudinal standing seams should be fastened every how many inches?
• What minimum pitch per foot is required for the horizontal run of a vent connector?
• Which instrument is commonly used to measure duct pressure during an airtightness test?
• Refrigerant safety is determined by toxicity and which property?
• Which duct shape generally has fewer joints per length and thus less leakage?
• How does temperature affect duct joints?
• Intake openings in occupancies other than residential shall have a maximum screen opening size of how many inches?
• For a 40x20 oval duct with a longitudinal seam, what is the duct gage?
• The minimum required volume for indoor combustion air is how many ft³/1000 BTU/hr?
• A duct that penetrates up to three floors without a fire damper must have a maximum nominal diameter of how many inches?
• Why are gaskets and sealants used on duct joints?
• When hanging a 36-inch round duct at 12-foot intervals, what is the minimum strap size?
• Why is it important to follow project drawings precisely?
• When using aluminum duct avoid which seam type?
• What is the purpose of a relief cut near a bend line?
• Which statement is true about a circular take-off in ductwork?
• When would you choose to use a pop rivet instead of a solid rivet?
• Which statement best describes the purpose of pattern development in sheet metal work?
• What is the purpose of a gap or seal at a seam?
• Refrigerant is rated for safety by toxicity and:
• When burrs are not removed after cutting, what hazards or issues can occur?
• What is the minimum clearance to combustible construction for exhaust serving a Type 1 hood?
• What is pattern development in sheet metal work?
• When selecting a bend radius for thin sheet metal, what must be verified to prevent cracking?
• A furnace rated at 24,000 BTUH requires how many square inches of free air?
• Which statement correctly reflects permit extensions?
• The ceiling height used to determine the room-to-furnace volume ratio is what maximum?
• What is the maximum required length for a typical slot diffuser connection to the maximum flex length?
• What is beading?
• A listed smoke damper designed to resist the passage of smoke shall be provided at each point a duct or air transfer opening penetrates which barrier?
• Non-metallic ducts shall have a flame spread index of 25 or less and a smoke-developed index of 50 or less.
• A duct is permitted to penetrate three floors or less without a fire damper at each floor as long as the duct does not exceed _____ inches nominal diameter.
• A joint that allows disassembly and alignment during installation most commonly uses which feature?
• What is hemming?
• A liquid that condenses from a gas by a reduction in temperature is called
• Boilers require a shut-off valve in which part of the piping, ignoring exceptions?
• Which option is not a finish used to protect sheet metal in humid environments?
• Which pipe material cannot be used on the exterior of a building or underground?
• What are the maximum flame spread and smoke-developed indices allowed for non-metallic ducts?
• What test is commonly used to verify duct system airtightness?
• Gypsum ducts are limited to a maximum temperature of which value?
• A chimney for a low-heat appliance must withstand a continuous flue gas temperature not exceeding how many degrees Fahrenheit?
• A furnace rated at 7,500 BTUH requires how many square inches of free air?
• The duct described for a 40x20 oval duct with longitudinal seam uses which gauge?
• In gas piping, which metallic piping should not be used?
• Flat oval duct construction shall be capable of withstanding a pressure ______% greater than that of the assigned pressure class without structural failure or permanent deformation.
• Disregarding exceptions, all boilers need a shut-off valve in the
• Aluminum has to be approximately what percent thicker than steel?
• Why is material grain direction often considered in metal forming?
• A furnace rated at 12,000 BTUH requires how many square inches of free air?
• A chimney for residential type or low-heat appliances shall exceed at least how many feet above the highest point where it passes through a roof?
• What is the role of punches and dies in sheet metal fabrication?
• 26 inch round duct, positive pressure, un-reinforced long seam 4 inches W.G. can be made of which gauge?
• A fuel fired furnace, measuring 22 cubic feet, must be placed in a room greater than how many cubic feet if it is not approved for closet installation?
• Which seam type should be avoided when using aluminum duct?
• Using 22 ga. Paint grip, duct horizontally mounted to a wall, the allowable load per fastener is how many pounds?
• Gypsum ducts are for return air only and limited to what maximum temperature in °F?
• A draft hood is located so the relief opening is not less than _____ inches from any surface except that of the appliance it serves.
• Ducts and plenums serving a Type II hood shall be constructed of ______ materials.
• What is one major advantage of using a nibbler over a shear cut when making curved contours?
• Which element may be found on a sheet metal pattern drawing to convey additional information?
• Which statement best identifies a good quality edge after punching or shearing?
• The process by which a gas converts to a liquid when the temperature decreases is called?
• What is the difference between a rivet and a bolt in sheet metal joints?
• What is a lock seam?
• The return air duct to a blower type warm air furnace requires how many square inches of free air per 1,000 BTUH of rated capacity?
• What is the maximum distance that 1 1/4 inch copper tubing should be supported?
• Type I hood seams are made with a continuous exterior liquid-tight joint by which method?
• What is the purpose of deburring after cutting?
• Where must the exhaust from a spray booth be discharged?
• Name three hand tools commonly used to cut sheet metal.
• What is the formula for circumference of a circle?
• The location of the point of delivery shall be acceptable to the
• Which statement about leakage is true?
• Which gas, in addition to air and carbon dioxide, is used for testing gas lines?
• In ductwork assembly, what does a sliding fit in a slip joint primarily facilitate?
• Given a machinery room ventilation system that terminates on the roof and an outside grille serving an air conditioning system in the penthouse, what is the minimum clearance between the discharge outlet and the intake for the air conditioning system?
• Factory built chimneys installed in dwelling units with solid fuel-burning appliances shall comply with Type HT requirements of which standard?
• What is a slip joint and what is it used for?
• Bend allowance is used to determine what parameter in sheet metal layout?
• How can you verify that a bend angle matches the drawing after forming?
• How does K-factor influence bend allowances in layout?
• What process involves folding the edge to produce a smooth edge and add strength?
• Given you are running a gas line and need to bore a hole in a joist. What is the clearance from the top to the bottom of the joist?