NOCTI Study Guide with complete solutions

A Class A fire extinguisher can be safely used on a/an _____ fire. A. Wood B. Grease C. Electrical D. Magnesium - Answer- A. Wood When welding in a confined space, the welder must have A. all equipment in a confined space B. a second welder inside the space C. an approved breathing device D. a watchperson outside the space - Answer- D. a watchperson outside the space On an OFC set up, the hose with the right-handed thread fittings connects to which gas? A. acetylene B. argon C. oxygen D. C-25 - Answer- C. oxygen Which of the following is a ferrous metal? A. aluminum B. mild steel C. copper D. lead - Answer- B. mild steel Welding with intermittent welds on both sides of a tee joint will result in___ A. controlling distortion over the entire joint B. putting too little heat in the joint for a successful weld C. putting too much heat in the joint for a successful weld D. controlling the atmosphere around the metal on both sides of the joint - Answer- A. controlling distortion over the entire joint The ability of a metal to withstand shock loading is known as its A. toughness B. hardness C. ductility D. malleability - Answer- A. toughness Ductility is a term used to describe what mechanical property in metals? A. ability to resist penetration B. ability to withstand impact C. ability to be stretched and formed D. ability to withstand corrosion - Answer- C. ability to be stretched and formed - Answer- Which of the following welds aligns two metal pieces approximately in the same plane? A. butt joint B. lap joint C. corner joint D. t- joint - Answer- A. butt joint What types of weld discontinuity is indicated by the arrow in the figure below? A. transverse crack B. toe crack C. crater crack D. underbead crack - Answer- A. transverse crack The ___ weld test is classified as a destructive test. A. radio graphic B. guided bend C. ultrasonic D. liquid penetrant - Answer- B. guided bend What is the measurement on the 1- inch scale below? A. 1/16 B. 1/8 C. 1/4 D. 11/16 - Answer- D. 11/16 Information contained in the tail of a welding symbol might include___ A. type of weld B. location of weld C. welding dimensions D. welding process - Answer- D. welding process Referring to the symbol below, the flag signifies a __ weld. A. field B. fillet C. bevel D. groove - Answer- A. field Which of the following welding symbols specifies a weld that extends completely around a joint? A. flag B. inverted triangle C. circle D. square above the symbol - Answer- C. circle Regulators are attached to cylinders by their A. outlet connection B. inlet connection C. relief valve D. adjusting screw - Answer- B. inlet connection A neutral oxygen-acetylene flame has a temperature range of A. 500-550 degrees Fahrenheit B. 580-630 degrees Fahrenheit C. 3,000-3,500 degrees Fahrenheit D. 5,800-6,300 degrees Fahrenheit - Answer- D. 5,800-6,300 degrees Fahrenheit The same style Oxyfuel Cutting tip is used for both natural gas and A. acetylene B. propane C. propylene D. MAPP - Answer- B. propane When oxyfuel cutting, 1/8 inch to 1/4 inch is the correct distance from the preheat flame cone to the A. kerf B. base metal C. undercut D. backing strip - Answer- B. base metal In PAC, kerf refers to A. the gap produced by cutting B. the solidified metal on the backside of the cut C. the center hole in the cutting tip D. an incomplete cut - Answer- A. the gap produced by cutting Compressed air must be _____ in the PAC process. A. moist B. lubricated C. completely dry D. carbon dioxide - Answer- C. completely dry In air carbon arc cutting, compressed air is used to A. cool the workplace B. dislodge molten material C. oxidize with fuel D. provide ventilation - Answer- B. dislodge molten material Electrodes used for CAC-A are made of carbon or A. brass B. graphite C. magnesium D. steel - Answer- B. graphite When plasma arc cutting, dross can form on the bottom side of the metal due to A. travel speed too fast or slow B. improper torch angle C. moisture in the compressed air D. air pressure set too high - Answer- A. travel speed too fast or slow What is the duty cycle of a welding power supply that can run for seven minutes out of every 10-minute period without overheating? A. 10% B. 40% C. 70% D. 100% - Answer- C. 70% When using reverse polarity, the electrode will be A. positive B. negative C. alternating D. neutral - Answer- A. positive Polarity on SMAW equipment must be set prior to welding to eliminate A. making fine adjustments while welding B. damage to equipment C. hazardous fumes D. undercut - Answer- B. damage to equipment What is the minimum tensile strength of an E6012 electrode? A. 600 psi B. 6,000 psi C. 60,000 psi D. 600,000 psi - Answer- C. 60,000 psi For what process is a DC constant-voltage power source used? A. CAC B. GMAW C. GTAW D. SMAW - Answer- B. GMAW One possible type of metal transfer when employing the GMAW consumable electrode process is _____ transfer. A. constant B. circuited C. intermittent D. globular - Answer- D. globular What must be matched to the electrode diameter? A. contact tip B. gas diffuser C. shielding gas D. constricting nozzle - Answer- A. contact tip A constant current power supply is required for A. GMAW B. GTAW C. FCAW D. SAW - Answer- B. GTAW The flow meter controls_____ when GTAW welding. A. cylinder pressure B. shielding gas pressure C. shielding gas volume D. cylinder volume - Answer- C. shielding gas volume An example of an inert gas is A. helium B. oxygen C. chlorine D. nitrogen dioxide - Answer- A. helium In GTAW of aluminum, the most common shielding gas used is A. pure argon B. 75% argon/ 25% helium C. 10% argon/ 90% helium D. pure helium - Answer- A. pure arg