HVAC Sheet Metal Block 1 Practice Exam

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• Which material would be used in a corrosive environment such as ductwork for a swimming pool?
• What is a straight line connecting the two end points of an arc called?
• Which component helps to reduce noise levels in HVAC systems?
• Which type of metal is considered non-sparking?
• What is the minimum width of work platforms on a rolling scaffold?
• What is the purpose of a hem on the edge of sheet metal products?
• What is rosin core solder primarily used for?
• What is the total allowance for a ½" double hem?
• What type of edge is placed on architectural metal work to force the water to drip away from the wall?
• In the layout of a right cone, what dimension helps determine its pattern?
• What type of transverse connection on round ductwork uses a rolled angle iron flange with matching bolt holes?
• What happens if an acid jar is filled to the maximum level?
• What is done to prevent the end of a manila rope from unraveling?
• What is the purpose of using a face shield when working overhead?
• What is the correct procedure to fabricate a 2 piece square to round with a 1" flange out and a collar?
• What rolls are used on the rotary machines to create an elbow lock?
• What is another term that is used to describe the shortness of metal?
• What is the mitre angle for the first gore of a four-piece 90 degree elbow?
• What is the total allowance for a groove seam?
• What is the method used to lay out a right cone?
• What is the maximum allowable height of a rolling scaffold?
• What is the minimum distance above the upper contact point that the side rails of your ladder should extend?
• Which layout method would be least effective for handling a curved surface?
• What seam is used to attach a round collar to the side of a rectangular duct?
• What does a Class A fire consist of?
• What stake has a long round end and a smaller flat end for riveting and forming on round objects?
• What type of load is exerted on an anchor when the weight is applied at a 90-degree angle to the anchor's embedment?
• A blueprint shows ductwork labeled as 20" x 12" and has 1" acoustical lining. How big should you fabricate the duct?
• What is the maximum safe working pressure for Acetylene?
• What is the purpose of turning vanes in HVAC systems?
• What prevents vibration from a suspended HVAC unit being transferred to the supporting structure?
• A drawing that displays the front face straight on while presenting other sides at an angle is referred to as what type of drawing?
• What adjustments do you make to a welding machine to ensure an adequate weld when performing GMAW?
• What is one important measurement for ensuring accurate fitting layout in HVAC?
• What is the total allowance for a ¼" groove seam?
• What is the best knot to use when joining two ropes of unequal diameter?
• How often should a rope used for hoisting be inspected for wear?
• When changing wire diameter on a GMAW machine, what else must be changed besides the tip?
• High carbon steel is primarily used for which application?
• What knot forms a loop around an object, will NOT tighten but will be easy to take apart?
• What component is installed in square throat and heel elbows to allow for better air flow characteristics?
• How is the radius for the pattern of a right cone obtained?
• What stake would be used to form a square to round?
• What are a series of evenly spaced lines indicating solid material on a section view known as?
• Pictorial drawings show how many sides of an object?
• What defines a metal alloy?
• Why should you NEVER paint a wooden ladder?
• What type of air distribution system has the main trunk reducing in size as branches distribute heat to different rooms?
• Which of the following is an example of a non-corrosive flux?
• What reduces the transfer of HVAC unit vibrations to the duct?
• In commercial HVAC systems, what is often the purpose of using a plenum?
• A contract drawing labels a duct at 24 x 36 and shows 1" liner. What size should the duct be fabricated?
• How long must a welding machine remain idle if it has been run at its rated output for a 40% duty cycle for the maximum amount of time?
• How many square feet of material is required to fabricate a duct that has a finished length of 42" and is 20" x 14"?
• Which component strengthens the hold of a sleeve anchor once installed?
• 60/40 solder is composed of what?
• When performing SMAW with an electrode designated as DCEP, which terminal would you plug the ground clamp into?
• What are special points or lines used in layout that don't fall on regular element lines known as?
• How are tinner's rivets sized for specification?
• What knot is used to fasten a rope to a fixed object such as a post or railing?
• What is the name of the point where the two outer edges of a cone converge?
• What is the method to determine true lengths for the layout of a tee branch at 45 degrees to the main pipe?
• What function do louvres serve in HVAC systems?
• What is the minimum distance a 1/4" diameter bolt can be placed from the edge of metal to the center of the fastener?
• To which class would a fire involving combustible vapors be assigned?
• What does a class B fire consist of?
• At what temperature does 50/50 solder melt?
• What is supply air?
• How is brass gaged in the HVAC field?
• What would be the total allowance for a ¾" hammer lock?
• What is the purpose of "Joist Liner"?
• Why would you not wear loose clothing around machinery?
• Which type of seam is typically used in metal fabrication for strength?
• When the machine is set to DCEP, which terminal would you plug the ground clamp into?
• The ability of metal to permit a change in shape without fracturing is known as:
• What auxiliary method is used to layout a fitting?
• What is the purpose of a bead on a collar?
• Allowing 1 ½" of material at each end, what is the cut size for a 20 x 16 flex connection?
• What is the correct order for completing a groove seam?
• What knot is used to tighten a rope securing a load to a truck?
• How should the acetylene tank valve be opened?
• What is the purpose of using rosin paste?
• What stake would be used to form an object with an abrupt taper such as a round weather cap?
• What does a Class A fire consist of?
• What is the typical use of a dip pot?
• What is the correct procedure for using a sleeve anchor?
• What is the primary purpose of a roof curb?
• How many true lengths are depicted in the elevation view of a right cone?
• The area confined by an arc and two radii is known as what?
• When are safety guards on a grinder required?
• How long can a welding machine run continuously without stopping if it is working at the 60% duty cycle amperage?
• How much does a 4-pound soldering copper actually weigh?
• What type of fire could a fire extinguisher labeled with a Red square be used on?
• What type of residential furnace has the supply air coming out from the top and the return in at the bottom?
• What is the main purpose of isolators in an HVAC system?
• What is the cut size for a saddle hanger for a 16" diameter pipe when allowing for 2" legs?
• Which seam will require soldering or fastening to ensure it stays together?
• What type of duct connection uses angle iron flanges at each section with matching bolt holes?
• What is the female allowance for a ¼" double seam?
• What process is used to increase the oxide layer on aluminum surfaces?
• What must be done when erecting scaffold over 10 feet high?
• What is the best knot to use for joining two ropes of equal diameter?
• Material that is created with small slits in metal, forming diamond-shaped openings, is known as?
• In a duct with a specified size of 24 x 36, what should be considered during fabrication?
• Which anchor would be best to secure a unit to a wood framed wall?
• What are the three ingredients required to sustain a fire?
• What piece of equipment is a 'clip' generally used for?
• How can acetylene fittings be identified by their thread type?
• The line of intersection between two adjacent gores of a round elbow is known as the?
• What type of transverse connection is commonly used on smaller, light gauge ductwork?
• Material that contains iron is classified as what?
• What is the nominal size of a standard 90-degree elbow?
• What is a common application for a drip edge in architectural metal work?
• What stake would be used for double seaming the bottom on a cylindrical container?
• Where is the typical location for return air grills in a residential HVAC system?
• What is the purpose of outside air?
• In what way do chemicals affect ropes?
• When laying out a rectangle-to-round fitting, what section of the plan view should be drawn?
• What method is used to lay out round elbows?
• What is the term for the increase in load on a rope due to sudden stops, swings, starts, or vibrations?
• Which type of ladder allows for maximum stability and flexibility for different heights?
• What does sal ammoniac serve as in soldering work?
• Which tools are used to finish a tinner's rivet?
• Which knot is best for attaching a lifeline to a fixed attachment point?
• What drafting tool is used to draw arcs and circles?
• Where are the "drives" usually located on rectangular duct as a transverse connection?
• When can the safety guards on a shear be removed?
• What are the major safety concerns of a handbrake?
• What would be the cut size for a straight length of duct that finishes 44" long, with duct dimensions of 14 x 8, fabricated in 2 "L" pieces?
• Which stainless steel grade is most commonly used in general purpose applications?
• What three items are essential to a fall arrest system?
• Which seam can be used to join a round pipe takeoff to the side of rectangular duct?
• How is the thickness of stainless steel measured?
• What is the maximum angle that a field fabricated single cut mitered duct can be?
• What is the primary purpose of a flex connection?
• If an anchor is tested to hold 1000 pounds, what is its safe working load?
• In HVAC, the term "duct" primarily refers to what?
• What is the cut size for a wrap hanger for an 18" diameter pipe when allowing for 2" legs?
• What is the most common duct material used for residential applications?
• What is the danger of being exposed to ultraviolet light given off by arc welding?
• What is the safety factor for rope used for lifts?
• Which is the best flux to use when soldering galvanized steel?
• What does a bright green flame on the tip of a soldering iron indicate?
• Who is responsible to ensure Worksafe BC regulations are followed?
• What type of anchor would be appropriate for securing a unit with a bolt in a concrete floor?
• What does a line drawn at ¼ size that measures 3 1/8" represent?
• How would you order your transitions if it was requested that you keep all horizontal duct as high as possible in the ceiling space?
• What is essential for achieving proper dimensions in HVAC fittings layout?
• What is the mitre angle for the first gore of a 4 piece 90-degree elbow?
• What is the minimum length required if a duct must offset 5" using a field fabricated mitred offset?
• What does the term 'dynamic load' refer to in relation to ropes?
• What is the recommended standard centerline radius for an HVAC elbow?
• What component of the HVAC system spreads the airstream at the termination of the supply run?
• What reduces the vibration from a suspended HVAC unit to the structure?
• What are the three ingredients required to sustain a fire?
• What shape is used in the symbol for a class C rated fire extinguisher?
• What type of anchor is a light duty anchor that is easily installed but requires the head to be cut off for removal?
• The ability of a metal to hold a load without permanent deformation is known as:
• If a square throat and heel elbow with turning vanes arrives on site twisted, what should be done?
• Where is the typical location for floor supply registers in a residential HVAC system?
• What is another name for cut acid?
• How must all compressed gas cylinders be stored and transported for safety?
• Which method is recommended for ensuring the longevity of ropes when in storage?
• What method is used to develop patterns for square-to-round fittings?
• What type of seam would not be used to connect a rectangular take-off onto a rectangular duct?
• Which type of connection requires the least amount of labor and sealing in ductwork installation?
• What is an important practice before using a rope for lifting?
• What is sweat soldering?
• What is the method used to lay out a fitting with a slant length?
• What should be done when erecting scaffold on an uneven surface?
• What forms on all metals when they are exposed to the atmosphere?
• What material would have the potential for the most galvanic corrosion if it was in contact with copper?
• What kind of edge is utilized to enhance water drainage in HVAC designs?
• Which device prevents the reverse flow of gas but does not extinguish a fire in the hoses?
• What type of furnace would be used on a home when the supply duct is run in the crawl space and the furnace is installed on the main floor?
• What tool is essential for measuring and marking angles accurately in sheet metal work?
• Which of the following materials exhibits the highest resistance to corrosion?
• Which two measurements are necessary to determine the true length of an element line when triangulating from a plan view?
• What is the common name for GMAW?
• What component is utilized to connect ductwork to an HVAC unit while accommodating movement?
• What is the minimum distance from the edge of the metal to the centre of the rivet for a 3/16 diameter pop rivet?
• Oil and grease should NEVER be used on a regulator for which gas?
• What is the main advantage of using a pop rivet compared to a traditional rivet?
• What component in an HVAC system enables better air flow characteristics in a square throat and heel elbow?
• Which of the following PPE would be appropriate to wear to protect your eyes when drilling concrete overhead?
• How is duct liner attached to the metal if the duct measures 20 x 16?
• What does a bolt designation of 3/8-16 x ¾ indicate?
• What is the purpose of flux?
• What indicates acoustically lined duct on a Mechanical HVAC print?
• Which component is used at the exterior termination of exhaust ducts to make them weather tight?
• What is the common shielding gas for GMAW mild steel?
• How often should PPE (personal protective equipment) be inspected?
• When is it acceptable to place your fingers beyond the finger guards of a shear?
• What is the size of the cut out wedge for 16" x 10" duct that is 36" long and must offset 3"?
• How do you check for leaks after replacing a hose on an oxy-fuel system?
• What is a common characteristic of a properly designed duct system?
• What controls the quantity of air from a diffuser?
• How should rope be stored to maintain its integrity?
• What is the best fitting to use when offsetting duct around an object?
• Which property describes a metal's ability to be drawn into wires?
• Sal ammoniac is primarily used for what application?
• A solution of sal ammoniac and water is commonly used for what purpose?
• When hydrochloric acid is mixed with small pieces of galvanized metal, what is produced?
• What is a recommended practice when using a ladder on uneven ground?
• Which class of fire extinguisher is used to put out an electrical fire?
• Which type of tool is most commonly used to cut sheet metal safely?
• What is the primary function of a balancing damper in an HVAC system?
• What is a hazard of wearing loose fitting gloves while operating the power forming rolls?
• What is the correct angle for a ladder leaning against a wall?
• What is the female allowance for a ½" standing seam?
• What is the main purpose of using dampers in an HVAC system?
• What is the name of the rectangular duct fitting that elevates a duct without changing its airflow direction or size?
• What type of fastener is designed to be removed without leaving a trace except in the embedding medium?
• If it is necessary to use a ladder at a flatter angle due to site conditions, what is a precaution you can take to prevent the base from slipping back?
• Which element is essential for reducing noise in HVAC ducts?
• Which airflow measurement is typically used for duct systems?
• Which stake has two cylindrical horns of different diameters and is used for forming, seaming, and riveting?
• What is the main purpose of duct liner?
• What method is used to attach a round branch to a spiral pipe?
• How is lead gaged in the HVAC industry?
• What material is commonly used for HVAC ductwork?
• Which type of duct is known to best handle thermal expansion and contraction?
• What must be used when velocities exceed 4000 Feet Per Minute on all upstream edges of transverse joints to ensure that the liner does not delaminate from the duct?
• An angle that measures greater than 90 degrees is categorized as what type of angle?
• The measure of resistance to indentation or scratching in a material is called:
• What is the primary characteristic of a corrosive flux?
• What is the maximum allowed fill level for an acid jar?
• Blind rivets are sized based on which dimensions?
• What is a disadvantage of synthetic rope (nylon or polypropylene)?
• What do the first two numbers of a welding electrode refer to?
• What angle of elbow would be obtained using only the 1st, 2nd and last gores of a 4pc 90 degree elbow?
• Which of the following best describes a Vanstone edge?
• What is the common name for SMAW?
• How is the thickness of copper measured in HVAC applications?
• Which duct fitting changes size from one end to the other without altering the direction of airflow?
• What type of fire typically involves flammable liquids?
• What does P.A.S.S stand for in fire extinguisher usage?
• What type of metal typically has black mill scale on its surface?
• How should you secure a ladder when working on a roof?
• What is the recommended length for an ogee offset for 20" x 12" duct that must offset 10" on the 12" side?
• After removing it from the wall bracket, what is the next step to use a fire extinguisher?
• What is the allowance for a Pittsburgh seam formed in a roll former?
• What type of edge is a 3/8"- 1/2" edge turned out on a round pipe often used in conjunction with a companion flange in industrial applications?
• What component is installed on duct and spiral to allow for service of internal components?
• What adjustments can be made to a welding machine used for SMAW?
• Where in an HVAC system is a backdraft damper installed?
• Hoisting with manila rope should only be done using which grade?
• In the elevation view of a right cone, how many true lengths are depicted?
• What method is used to gauge hot and cold rolled steel?
• What type of load does the term 'static load' describe?
• What type of patented transverse connection is roll formed on large rectangular HVAC duct?
• The ability of metal to resist wear, cutting, or penetration is known as:
• When is it acceptable to remain on a rolling scaffold while it is being moved?
• What is the primary purpose of annealing metal?
• What is the total allowance for a ¼" double seam?
• What size of groove seam tool is required to finish a 3/8" groove seam?
• If the working length of a ladder is 16 rungs, how far should the base of the ladder be from the wall?
• In what position can an E7018 welding rod be used?
• What is the primary use of a needlecase stake?
• Which duct connection method is classified as a "patented duct connector"?
• Which of the following can damage a rope?
• If you must use a ladder at a steeper angle due to site conditions, what precaution should you take?
• What is the oxide layer on copper commonly referred to as?
• Which material is best used for ductwork in a corrosive environment?
• What is the minimum height of toe boards for scaffolds?
• What is hardware cloth typically used for in HVAC systems?
• What does the third number on a welding electrode refer to?
• What MUST be done after completing a weld with the SMAW process?
• The ability of metal to hold a load under compressive or tensile stress without failure is:
• Which type of metal would be least suitable for outdoor applications without protective coatings?
• How are isolators rated in an HVAC system?
• What is required in order to perform plasma arc cutting safely?
• What prevents vibration from a HVAC unit transferring to the connecting duct?
• What describes the reaction between two dissimilar metals that touch each other?
• What is the correct procedure for fabricating a straight length of duct with Pittsburgh seams and S and D connections?
• How much does a knot in a rope typically reduce the breaking strength by?
• What is the process of heating a metal and cooling it slowly to make it more ductile known as?