NCCER Sheet Metal Level 3 Practice Test

These questions are part of the practice quiz. Start practicing

• Which method is commonly used to measure the thickness of light gauge stainless steel?
• What type of load is an anchor experiencing when suspending a load in a concrete slab?
• Which kind of air does the exhaust duct primarily handle?
• What is the name of the fitting that modifies duct size without altering airflow direction?
• What does the collet body of a TIG torch do?
• Which instrument is used to measure both wet bulb and dry bulb temperatures?
• What method of pattern development is used to layout a twisted transition?
• What is the correct term for TIG welding?
• A linear slot diffuser measuring 8" x 24" with a K factor of .78 has a free area of how many square inches?
• The volume of airflow in a duct is expressed in what unit?
• How many CFM would be supplied for a room that measures 12' x 24' with an 8' ceiling requiring 14 AC/H?
• What is the key characteristic of a backward inclined fan?
• Which architectural drawings would indicate the location of diffusers in a building?
• Which shop layout tool can be utilized to quickly calculate the size of an opening for a round Y branch?
• What is the recommended angle for a drill bit when drilling stainless steel?
• Where should outside air intakes be located to ensure proper ventilation?
• Which drawings would you reference to locate available space for ductwork in the ceiling above the T-bar on the fourth floor?
• According to SMACNA standards, what is the minimum length required for a field fabricated single mitre offset for a duct of size 14 x 14 requiring an 8" offset?
• What is the recommended length of straight duct at a fan outlet measuring 18 x 26 with an air velocity of 6000 FPM?
• Which type of stainless steel is classified as magnetic?
• What is the sharp edge left on a sheet after shearing called?
• What is the primary purpose of lining a chute in HVAC systems?
• Which factor is important when designing an efficient HVAC system?
• What is the name of the grid system that uses letters along the top and numbers along the sides of a drawing?
• What is the miter angle of an 8" diameter, 5 pc 120 degree, HVAC elbow?
• Which type of stainless steel is known for having the best corrosion resistance?
• When the motor sheave is changed from 2" to 2.5" in diameter, and the initial CFM is 2100, what is the new CFM after the change?
• How is BHP affected when the drive sheave size is doubled?
• What does the "24" refer to in a beam designated as W24X72?
• What type of air enables the balancing of return air and outside air?
• What is the advantage of using DCEN in TIG welding for stainless steel?
• What measurement system is used to determine the thickness of light gauge stainless steel?
• During fabrication, why is it essential to check the angle of the corner for a food service fixture?
• What material characteristic is important when fabricating items for the marine industry?
• What two components of the TIG torch must be changed when altering the size of the tungsten?
• Under what condition is it acceptable to remain on a rolling scaffold while it is being moved?
• Which technical document provides detailed hazard information about a product found in the workplace?
• What is the correct work angle for a butt weld performed in the flat position?
• For best airflow, what is the minimum recommended centerline radius of an 8" diameter, 5 pc 120 degree, HVAC elbow?
• What should be done when erecting scaffold on uneven surfaces?
• What is the primary material of the electrode used in TIG welding?
• Which PPE has an expiration date?
• How many BTUs does it take to raise 1 pound of standard air by 1 degree F?
• What is an example of a terminal device in HVAC systems?
• What happens to the airflow when increasing the diameter of a sheave attached to a motor?
• What are straight fan blade configurations typically used for?
• What is the term for the vertical distance that air drops after leaving the outlet?
• What is a primary advantage of return air ducts?
• The "Scope of Work" that begins each division defines what?
• Which division in the specification book includes details about the HVAC system?
• Mechanical drawings that are created at a larger scale to detail smaller parts of HVAC equipment are known as?
• What is the sector height of a round Y branch with openings of 9", 12", and 15"?
• What terminal is the ground connected to during TIG welding of stainless steel?
• Which polarity provides the greatest penetration when performing SMAW?
• What letter is commonly used to designate structural drawings?
• What happens to CFM if the drive sheave size is doubled?
• Why is there a filter in the mixed air plenum before the fan of a duct heating system?
• What is the minimum length for a field fabricated single cut mitred offset according to SMACNA standards?
• Grilles, registers, and diffusers are categorized as what type of devices?
• Which finish is commonly used for food service countertops?
• Where is the outside air piped into a residential system?
• What is the recommended length to order for an ogee (radius) offset if a duct width is 12" and requires a 5" offset?
• Which fan type is more efficient at moving larger volumes of air against a higher resistance?
• In which type of pictorial drawing is the front face presented straight on?
• What is the purpose of ventilation air with a fossil fuel burning appliance?
• How does argon assist in the TIG welding process?
• What is the role of outside air in a building's ventilation system?
• What method is typically used to lay out the pattern for a cone?
• What is the center-line radius of a 7 pc 90 degree, 12" diameter industrial elbow?
• What is the maximum distance from clean out to clean out on a straight run of grease laden exhaust duct?
• If the motor sheave diameter is increased from 2" to 2.5", what will be the fan RPM if the original RPM was 400?
• Which polarity is best used for TIG welding stainless steel?
• Why is it crucial to maintain a slight positive pressure in commercial HVAC systems?
• When is a counterflow furnace most appropriately used?
• Where is the best location for return air grills in a residential HVAC system?
• What is the function of deburring raw edges on stainless panels?
• What size of a Type B fire damper would be ordered for a lined duct measuring 24x12 ID?
• What does the term "Delta T" refer to?
• What is the minimum distance from any outside air inlets that the point of exhaust should be kept?
• Who is responsible for ensuring all material is handled in accordance with safe work procedures?
• How does an increase in static pressure affect the performance of a fan?
• What is the minimum length for a field fabricated double cut mitred offset for a duct of 14 x 14 with an 8" offset as per SMACNA standards?
• Which common chemical element is primarily responsible for enhancing the ductility of stainless steel?
• Which type of tungsten is best used for welding stainless steel?
• What is the biggest safety concern when using mismatched punches in the Rotex?
• When using a handbrake, how should the metal be positioned?
• Which finish number indicates a mirror finish on stainless steel?
• If the adjustable blades of a supply register are moved closer to the closed position, what happens to the static pressure?
• What is the maximum allowable height of a rolling scaffold?
• What configuration is typically required for the transition from vertical to horizontal ducting?
• For a 12x8 to 8x8 S+D Change cheek elbow with a 6" throat radius, what is the cut size of the heel of the elbow?
• What is the purpose of Make-up air?
• Which component of an HVAC system allows for varying air volumes to be supplied across different zones for tailored heating and cooling?
• What is an important step prior to using a spot welder for stainless steel?
• Which electrode is suitable for TIG welding stainless steel?
• What type of fire extinguisher is designed for fires involving wood and paper?
• What is the term for the amount of heat required to raise the temperature of any substance by 1 degree F?
• What is the minimum size hole required in a fire wall for a fire damper ordered as 32X18?
• What type of vent is used on a high efficiency condensate furnace?
• Which component of a split air conditioning system is installed in the duct?
• What is the best method of pattern development to layout a right cone?
• When changing dies on the press brake, what mode must the machine be set on?
• Which type of stainless steel offers the best corrosion resistance?
• What is the correct term for the welding process known as TIG welding?
• What is done to a raw edge stainless panel to ensure the safety of users?
• What is the purpose of using a grid system in architectural drawings?
• When performing SMAW with an electrode designated as DCEP, which terminal would you plug the ground clamp into?
• What must never be worn while operating the power rolls?
• What is the standard light gauge all purpose finish that is grainless and often used for industrial applications?
• An addendum is defined as what?
• Which polarity is commonly used for welding stainless steel?
• What is the term for pressure lost due to turbulence in air flow?
• If a duct must measure 14" on one side to deliver 1400 CFM at a velocity of 1200 FPM, what should be the measurement of the other side?
• What should be done when fabricating a stainless food service fixture that fits in a square corner?
• Exterior components of a building are best located using which type of drawing?
• What is the primary purpose of a metal shear?
• What is the duct surface area in square feet of a 38 foot run of 20" diameter pipe?
• Which symbol is used to indicate a fire damper in a vertical duct?
• What are the two main classifications of fans commonly used in ventilation systems?
• What is a potential safety hazard when using a dull drill bit on the drill press?
• What is the typical application of Type 304 stainless steel?
• Which type of stainless steel is characterized as more affordable yet less resistant to corrosion?
• Why is it important to properly maintain welding equipment?
• Elevations of structural steel on drawings are usually measured above a given reference point, or:
• What is the velocity of air in a duct measuring 20" x 20" that is supplying 2000 CFM?
• In what unit are duct air pressures typically expressed?
• What can cause noisy airflow in a duct?
• Which method of pattern development is appropriate for laying out a rectangular hopper?
• When triangulating from the plan view, which two measurements are put on the true length diagram?
• According to the equal friction chart, what is the velocity in a 20" diameter pipe that delivers 2000 CFM?
• Which option best represents the function of the mixed air plenum?
• How much does one cubic foot of standard air weigh?
• When creating a pattern for a duct transition, which development method combines both straight and radial elements?
• What is the main advantage of using TIG welding over other types?
• When fabricating a fixture along a wall, what should the site be checked for?
• If the working length of a ladder is 24 feet, how far should the base be from the wall?
• What does HRV stand for?
• Where on a residential heating system is a "PTO" installed?
• What is the new static pressure (SP) if the original SP was 1.2" and the motor sheave was changed from 2" to 2.5" in diameter?
• What method of pattern development is used to layout a drop cheek elbow?
• A room measures 38' x 38' x 10' high. How many CFM enters and leaves the room if 55,920 cubic feet of air moves through the room each hour?
• What is the term for heat conveyed on currents of air?
• Approximately what percentage of oxygen does the air we breathe contain?
• What adjustments are needed on a spot welder when switching from galvanized steel to stainless steel of the same thickness?
• What does IAQ stand for in relation to air quality?
• A rectangular duct layout will typically use which method for accurate design?
• What should be done if a grease duct is too close to a combustible wall?
• The CSI format of organizing the specs has how many divisions?
• Friction loss in an HVAC system is typically measured by loss per how many feet of straight duct?
• What should an employee do if they notice unsafe working conditions?
• How is airflow adjusted in a VAV system?
• A common shielding gas when performing GMAW is what?
• Which of the following best describes the process of stainless steel welding and finishing?
• What material is commonly used in the construction of exhaust ducts?
• Which stainless steel type is known for its high strength and toughness?
• HVAC system drawings using single lines to represent duct runs are known as what?
• Drawings that use symbols and lines to show the arrangement of system components, without the actual locations, are referred to as?
• Which drawing would you use to verify ceiling heights?
• What is the purpose of relief air in an HVAC system?
• Which approach is most efficient for the pattern development of ducts in confined spaces?
• What is the typical minimum clearance required between a duct and non-combustible materials?
• The abbreviation T.O.S on a structural drawing stands for:
• What defines a packaged unit in HVAC systems?
• A VAV system supplies air that is characterized by?
• What is the maximum angle for a field fabricated double cut mitred offset as per SMACNA standards?
• What is the process of heat transfer through material called?
• What is the Celsius equivalent of an F-C of 85 degrees?
• What does the third number on a welding electrode indicate?
• Which of the following should be worn at all times in a metalworking environment?
• What is the standard measurement for the throat of a rectangular duct elbow at a specified angle?
• Which type of fan generates airflow that is perpendicular to its axis?
• Where can one find information about sizes and models of HVAC system components?
• Forward curved fan blade configurations are commonly used in which application?
• How far from combustible material must grease laden exhaust duct be kept according to code?
• What factor is taken into account when determining the wire diameter for GMAW?
• What preparation must be done before butt welding ¼" stainless steel?
• After increasing the diameter of the motor sheave from 2" to 2.5", what would be the new brake horsepower (BHP) if the old BHP was 1.4?
• What type of plan would typically show the layout of rooms and walls in a building?
• What function does a duct transition fitting serve in HVAC systems?
• When forming a taper in the forming rolls, which roll needs to be set to a different depth?
• Where are filters for cleaning the supplied air typically installed?
• What is the correct angle for a ladder leaning against a wall?
• What is static pressure in the context of ductwork?
• What adjustment is commonly made on the machine when TIG welding stainless steel?
• What is a characteristic of a psychrometer?
• What is a necessary safety precaution when using a bench grinder?
• How can the speed of a drill press be increased?
• What is the main role of filters in the HVAC system?
• Which type of stainless steel is most commonly used for high-temperature applications?
• The division in the Specification book that contains information regarding roofing, flashing, siding, and skylights is:
• Which processes are involved in air conditioning for human comfort?
• A fire extinguisher that is identified with a square can be used to put out which fire?
• A mechanical print shows duct that is 16" x 24" and an ogee that offsets 6", how long should the ogee be fabricated?
• What are diffusers mounted over a light fixture with air outlets on both sides called?
• What is the purpose of the return air duct?
• What is generally assumed to be the maximum angle for an HVAC elbow?
• What method is used to layout the pattern for a T branch?
• Which type of pictorial drawing depicts all three sides at an angle, creating the appearance of being tilted towards the viewer?
• A multi-zone, constant volume, variable temperature system is defined by which of the following features?
• What is the term used to describe the difference between the throat height and the heel height of an elbow gore?
• Which of the following is NOT a common steel shape for structural members?
• Which type of stainless steel is commonly used to fabricate items for the marine industry?
• When performing GMAW, which adjustment is crucial for ensuring an adequate weld?
• What must be done before a leakage test can be performed?
• For a butt weld in the flat position, what is the correct lead angle?
• The "W" in a W16x50 Beam indicates that the beam is:
• What element is added to stainless steel to improve corrosion resistance?
• Which equation represents the relationship between static pressure and velocity pressure?
• Which HVAC component is indicated by the reflected ceiling plans?
• What type of drawings show details of construction and assembly of parts at a larger scale?
• When bending stainless steel in a handbrake, by how many gages is the capacity reduced?
• What is the stretch-out measurement for the throat of a 12" x 8" rectangular duct elbow at 60 degrees, with a throat radius of 9"?
• What happens when mild steel particles become embedded under the oxide film?
• Which of the following is true about the installation of grease ducts?
• What is the ideal location for installing a residential thermostat?
• Which type of stainless steel is known for being easily deep drawn?
• What can result from negative pressure in a space?
• Which section of the specification book covers stainless food service equipment?
• In a single-path system, the heating and cooling coils are arranged how?
• What are HEPA filters?
• Which is the standard light gauge all-purpose finish on stainless steel that is used when finished appearance is of little or no concern?
• What type of energy transfer occurs during conduction?
• What is the most common inert gas used when welding stainless steel?
• How many workers can responsibly give signals to the crane operator?
• What is the minimum idle time required for a welder rated at a 40% duty cycle after operating at its maximum output?
• What division addresses the fastening methods of metals including riveting, soldering, and welding?
• What term is used to describe the angle at which shear knives are set?
• What part of the TIG torch is sized by the diameter of the tungsten?
• What would be the slant length of a reducer transitioning from a 14" diameter to a 10" diameter, with a center length of 8"?
• When welding stainless in straight polarity, which terminal is used for the ground?
• What happens to airflow when the diameter of a duct increases?
• For accurate dimensions of specified beams, what should always be referred to?
• What type of information is typically documented in construction detail drawings?
• Commercial HVAC systems are designed to maintain what type of pressure?
• In ductwork design, what helps to determine the correct dimensions for fittings and transitions?
• What method of pattern development is commonly used to layout a gored elbow?
• What term is used to describe the point at which two duct segments meet?
• In HVAC systems, how is total pressure calculated?
• What type of exhaust is connected to a HRV?
• What is the diameter of the large opening in a round Y branch if the small opening is noted as 13 inches?
• What type of welding is best suited for joining thin sheets of metal?
• What is the standard finish number commonly used for food service countertops?
• A room measures 38' x 38' x 10' high. What is the volume of the room in cubic feet?
• What training is required to work in a small, underground space with limited entry or exit?
• What causes all ventilation of a space and movement of air in a duct?
• For an 8x4 to 5x7 transition duct with a 3" take-off toward the 5x7 side, what is the slope of the bottom?
• In what position must the ram be in when the press brake is not in use?
• In the context of sheet metal layouts, which term refers to a method that requires calculating angles and lengths to form proper joints?
• What is the minimum number of return air grills required in a home with 3 finished floors?
• What type of pattern would you most likely use for the fabrication of a right-angle elbow?
• Which component of a TIG torch holds the tungsten electrode in place?
• What is the minimum gauge of metal allowed for fabricating a fire damper sleeve?
• How many CFM will be delivered by a duct measuring 14" x 16" with air traveling at a velocity of 1200 FPM?
• Which division of the specifications book would provide details about fan requirements for an HVAC system?
• What should the time and current settings be when changing welding materials?
• What tool is primarily used for making precise bends in sheet metal?
• What type of fan is characterized by a curved blade design for efficiency?
• What is the primary purpose of velocity pressure measurement in duct systems?
• What should be done to prevent injury if a large temporary floor opening must be left open and is unattended?
• What is the correct work angle for a butt weld in the flat position?
• What is the correct shade of filter lens to use when conducting Gas Metal Arc Welding (GMAW)?
• In gas metal arc welding, what is the purpose of the shielding gas?
• When triangulating from the elevation view, which two lines are used to calculate a true length?
• What is the total required slope in inches of a horizontal run of duct that is 50 feet in length?
• What is typically the main reason for using a larger centerline radius in ductwork fabrication?
• What happens to the volume of air when it is heated?
• Generally, how does the grain of a stainless fixture for food service run?
• The sharp edge left on a piece of stainless steel after shearing is known as what?
• Which pattern can be laid out using radial line development?
• Which type of anchor is recommended for easy removal in a solid concrete wall?
• Combustion air openings are important for preventing the production of what harmful substance?
• What method of pattern development is used to lay out a flat back?
• What method(s) of pattern development are utilized to layout a 3 piece square to round 90 degree elbow?
• Which class of fire extinguisher is used to put out an electrical fire?
• What is the most common inert gas used when TIG welding stainless steel?
• Backsplashes on a stainless fixture that fits against a wall must be:
• The velocity of air flow in a duct is typically expressed in which unit?
• Where is the usual location of supply registers?
• What is velocity pressure?
• The division in the Specification book that contains information regarding thermal and moisture protection is:
• What is the process of air rubbing against the ceiling or wall called?
• Why are architectural floor plans important to all building trades?
• What term describes the distance an air-stream travels from the outlet?
• When determining the available ceiling space for a duct run, what should you consult?
• What does the exhaust air duct primarily do?
• What part of a residential system would use joist liner?
• What is the primary purpose of the supply air duct?
• Which finish number indicates a mirror finish?
• How is the quantity of heat expressed in HVAC terminology?
• A room measures 38' x 38' x 10' high. How many air changes per hour occur (ACH) if 55,920 cubic feet of air enters and leaves the room each hour?
• What element contributes to the formation of a tough surface oxide in stainless steel?
• What adjustment is made on a power shear to accommodate heavier gauge metal?
• What is the primary cause of undercut in a weld?
• Architectural drawings primarily describe what aspect of a building?
• Occupants in a room may begin to feel effects when the oxygen level drops to what percentage?
• Where can information regarding room finishes, finished ceiling heights, and door sizes and types typically be found?
• What effect does machining have on the capacity of machinery when fabricating stainless steel?
• According to the OWL formula, what is the cut back wedge size for a mitred offset from a 14" X 14" duct with a 2 1/2" offset?
• How much cubic feet does 1 pound of standard air occupy?
• A properly designed fitting will achieve what result?
• What type of elbow fitting typically requires a cheek piece for proper assembly?
• What must be changed if the wire size is altered in the GMAW process?
• What is the aspect ratio of a duct measuring 32 x 22?
• What type of pressure is typically avoided in commercial kitchens to ensure proper ventilation?
• What diameter duct is required to deliver 2000 CFM at 0.05" friction loss?
• What element is added to stainless steel to enhance its corrosion resistance?
• A beam designated as a W16x50 will have an approximate depth of:
• How does a high efficiency furnace utilize a high percentage of the available BTU in a fuel?
• If there is a conflict between the plans and the specifications, what should be done?
• What is the maximum angle allowed for a field fabricated single mitre offset according to SMACNA standards?
• If the drive sheave size is doubled, how will the speed of the fan change?
• What does a decrease in static pressure generally indicate in an air distribution system?
• If you have 1.5 lbs of air, how many cubic feet of standard air does it comprise?
• What is done during commissioning of a duct system to ensure correct rotation of the fan?
• Mechanical drawings in a set of blueprints are designated with which letter?
• Mixed air is a combination of which two types of air?
• In addition to the HVAC system, what other system is shown in mechanical drawings?
• What type of drawings are used to place food service equipment in a restaurant?
• Under what circumstances is it acceptable to place fingers beyond the finger guards of a shear?
• What do structural drawings of a building typically show?
• What is the best method of pattern development to layout a round Y branch?
• Backward inclined blade fan configurations are primarily used for what type of application?
• A duct delivering 300 CFM at a friction loss of 0.2" will have what velocity?
• What does it mean when a sample of air has reached 100% relative humidity?
• In what scenario would a wedge anchor be particularly advantageous?
• When does air have the maximum capacity to hold moisture?
• Under what circumstances must a clean out be provided for grease laden kitchen exhaust duct?
• What is the main purpose of transfer air in a ventilation system?
• What layout method should be used for a cylindrical design?
• When hanging a stainless exhaust hood on a wall, which of the following is NOT considered in selecting the anchor type or anchor spacing?
• Which of the following electrodes can be used for TIG welding stainless steel?
• What method of pattern development is used for a finial?
• What is the primary function of carbon filters?
• Which drawing would you refer to for understanding room and structural layouts?
• How many BTUs does it take to raise the temperature of 1 pound of water by 1 degree F?
• Which type of furnace is most suitable for installation in an attic space?
• What is one effect of improper amperage settings in TIG welding stainless?
• Which of the following methods is used for developing patterns for complex shapes?
• If a reading from a 20-point traverse shows a velocity pressure (VP) of .48" wg, what would the velocity of the air be?
• Which type of stainless steel is characterized as being magnetic?
• When the drive sheave size is doubled, what happens to the static pressure?
• Where are the addenda typically found?
• Details regarding the interior layout of walls are commonly found in which type of drawing?
• When using the drill press to make a hole in thin sheet metal, what must be done?
• What color is the end of the tungsten used for welding stainless steel?
• What is the term for a rectangular duct elbow that changes dimensions across the cheek but not across the heel and throat?
• Which type of fan discharges air perpendicularly to its inlet?
• What is the primary purpose of the inert gas in TIG welding stainless?
• Which of the following is a common issue when air velocity is too high in a duct?
• Which instrument is used to measure duct pressures?
• What does a change cheek elbow allow in terms of duct configuration?
• What is the small opening diameter of a round Y branch that has a large diameter of 18" and a smaller diameter of 12"?
• What is a key consideration when selecting tungsten size for TIG welding?
• What is the purpose of lining a duct with thick insulation and perforated metal?
• What type of drawings must be referenced to depict the HVAC duct that needs to be removed during renovations?
• To maintain good indoor air quality, what should return air ducts do?
• Which process involves heat transfer without physical movement of material?
• What type of centrifugal fan is commonly used in large HVAC systems?
• What factor primarily influences the size of the tungsten used for TIG welding stainless steel?
• What do the first two numbers of a welding electrode refer to?
• In the equation V=4005*sqrt(VP), what does VP represent?
• Which division in the specification book contains information regarding food service equipment?
• What is the significance of reaching the dew point in HVAC systems?
• In HVAC terminology, what does K factor refer to?
• What type of pressure are commercial kitchens designed to have?
• What is the optimal position for a grease duct to improve ventilation?
• What is the primary reason gravity vents are effective in moving air?
• What element is responsible for providing the tough surface oxide on stainless steel?
• What is the process called when heat is conveyed by rays traveling in a straight line?
• What factor primarily determines the CFM delivered by a duct?