CWB Level II Exam Questions and Correct Answers

CWB Level II Exam Questions and Correct Answers On a radiograph, undercut appears as a _________ line. (A) light (B) dark - Answer-(B) dark What is the Canadian Standard for safety in welding? - Answer-CSA W117.2 What is the typical three-phase input voltage in most Canadian welding shops? - Answer-600V True or False: The cable from the workpiece back to the welding machine is called the "ground lead". - Answer-False. The correct term is the "work lead". What is the type of radiation that can damage living cells? - Answer-Ionizing Name two examples of ionizing radiation. - Answer-X-rays and Gamma rays What is the minimum suggested shade for a welding helmet when using 5/32 SMAW electrode at 150 A? - Answer-Shade 10 Approx. how far could spatter travel when welding/cutting from 2.5m high? - AnswerPossibly up to 6m What is the toxic component contained in some copper alloys? - Answer-Beryllium Which welding process will likely have the highest fume generation rate? [SMAW / SAW / FCAW] - Answer-FCAW What do the terms TLV and TWA stand for? - Answer-TLV: Threshold limit value TWA: Time weighted average Is helium lighter or heavier than air? - Answer-Lighter The action of UV light on oxygen produces which toxic gas? - Answer-Ozone Which common fuel gas has the widest range where it can become flammable when mixed with air? - Answer-Acetylene What substance should you NEVER apply to a stiff pressure-adjusting screw on an oxygen regulator? - Answer-Oil or grease What is the maximum gauge pressure that acetylene should be used? (kPa/psi) - Answer-103 kPa (15 psi) Which toxic gas is produced when welding on surfaces with chlorinated hydrocarbon solvents? - Answer-Phosgene gas What is the typical max. OCV of an AC welding machine? - Answer-80 V In an isometric drawing, the lines (for width, length and depth) are inclined at an angle of how many degrees? - Answer-30° What are the maximum number of views in an orthographic drawing? - Answer-6 What are the two general classes of picture drawings? - Answer-Perspective and Isometric What are the 5 basic weld types? - Answer-1) Groove 2) Fillet 3) Plug/Slot 4) Surfacing 5) Edge What is the term used to describe the following condition of lost corrosion resistance? "When certain stainless steels are heated between 500-850° C, carbides form at the grain boundaries and cause a local depletion of chromium." (A) Oxidization (B) Increased toughness (C) Solution heat treatment (D) Sensitization - Answer-(D) Sensitization Note: Also known as "carbide precipitation" -- Chromium binds to carbides, and "sweats out" at the grain boundaries Plasma cutting torch temp can reach temperatures of __________ ° Celsius. - Answer30,000 True or False: All plasma arc cutting equipment is operated using DCEN. - Answer-True True or False: Stainless steel can be readily cut with a normal oxy-fuel gas process. - Answer-False What are the two basic methods of plasma torch operation? - Answer-Transferred and Non-Transferred arc In North America, the 3 othographic views most commonly-used are: TOP, FRONT and __________ Side. [RIGHT / LEFT] - Answer-LEFT What is the difference between a "weld symbol" and a "welding symbol"? - Answer-A "weld symbol" indicates the specific kind of weld to be used (ex. fillet), and is contained inside of "welding symbol". In a welding symbol, is the size of the weld located to the LEFT or RIGHT of the fillet weld symbol? - Answer-LEFT In a welding symbol, is the length of the weld located to the LEFT or RIGHT of the fillet weld symbol? - Answer-RIGHT In what direction do the electrons flow in an electrical arc? (A) anode --> cathode (B) cathode --> anode - Answer-(B) cathode --> anode In arc welding, the arc temperature can exceed temperatures of __________ ° Celsius? - Answer-30,000 Which welding process has the highest arc efficiency? - Answer-SAW Arc voltage __________ when arc length is increased. [Increased / Decreased] - Answer-Increases In GTAW, what type of penetration and weld width can be expected when using DCEP? - Answer-Shallow penetration, and wide weld