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ASNT LEVEL 3 EXAM BASIC MATERIALS AND PROCESSES
EXAM | ALL QUESTIONS AND CORRECT ANSWERS |
ALREADY GRADED A+ | LATEST EXAM | VERIFIED
ANSWERS
Which of the following statements is true concerning surface finishing ------- --CORRECT ANSWER-----------------Cleaning operations are considered to be surface-finishing process. Surface finishing is often performed for corrosion protection. Surface finishing is sometimes performed to improve surface and near surface mechanical properties Carburizing and flame hardening are examples of ---------CORRECT ANSWER-----------------Case hardening process Which of the following nondestructive tests would provide the best results in measuring the case depth on a case hardened part. ---------CORRECT ANSWER-----------------Eddy current Coatings are often applied to protect a material; their thicknesses can frequently be determined nondestructively by ---------CORRECT ANSWER- ----------------Eddy current The best and most economical cleaners used for removal of oils and greases are ---------CORRECT ANSWER-----------------Petroleum solvents
Some materials, such as aluminum, are corrosion resistant: --------- CORRECT ANSWER-----------------By virtue of the immediate oxidation of newly exposed surfaces. All of the following statements concerning electrostatic spraying are true ---- -----CORRECT ANSWER-----------------The material being sprayed is directly attracted to all of the surfaces to be covered. there is less waste due to oversprayed material. There is more uniform coverage of the surfaces. A corrosion protection material commonly applied to steel by hot dipping and galvanizing is ---------CORRECT ANSWER-----------------Zinc. Metals commonly applied to other metals by electroplating are --------- CORRECT ANSWER-----------------Nickel, Chromium and Cadmium A process that covers the base metal surface to an oxidized barrier layer of very small porous cells is called ---------CORRECT ANSWER----------------- Anodizing The anodized surface on aluminum ---------CORRECT ANSWER-------------- ---Can produce a high background during a penetrant test A technique for the inspection of a manufactured products that utilizes the selection of a certain percentage of parts for inspection is called --------- CORRECT ANSWER-----------------Random sampling
Gages such as plug gages, ring gages, go/no-go gages, profile gages, thread gages, radius gages, ect., are all types of ---------CORRECT ANSWER-----------------Fixed gages Devices that show magnified reflected of profile images of the workpiece on a frosted glass screen are called optical ---------CORRECT ANSWER-------- ---------Comparators Fracture is a type of material failure. Of the following which is another type of material failure? ---------CORRECT ANSWER-----------------Permanent deformation. Which of the following statements best differentiates between a defect and a discontinuity? ---------CORRECT ANSWER-----------------Discontinuities can propagate and become defects. Nondestructive testing is often differentiated from other measurements or inspection techniques in that: ---------CORRECT ANSWER----------------- NDT involves indirect tests related to some other quality or characteristic of material. What are the functions of NDT? ---------CORRECT ANSWER----------------- Identifying and sorting of material. Identifying of material properties. Ensuring absence of faults or defects that could cause a part to fail.
An important basis for the success of fracture control design procedures is: ---------CORRECT ANSWER-----------------The need to ensure that unexpected flaws of some critical size are not present when the component enters service. If properly used, NDT can assist in fracture control by: ---------CORRECT ANSWER-----------------Providing an accurate evaluation of the number and type of discontinuities that exist in a material. A statement that a particular experiment produced a 0.9 probability of detection with a 95% confidence level means that: ---------CORRECT ANSWER-----------------There is a 5% probability that the probability of detection is overstated. Most solid metals and plastics that have reasonable strength at room temperature are called: ---------CORRECT ANSWER----------------- Engineering materials. Material properties, as used in design, are most frequently determined by: - --------CORRECT ANSWER-----------------Materials testing. Even at the early stages of product planning, NDT should be considered because: ---------CORRECT ANSWER-----------------The design of the part should permit easy access to critical areas for later inspection. Which of the following material properties are of most concern if corrosion resistance is essential? ---------CORRECT ANSWER-----------------Chemical properties.
The modules of elasticity, or Young's modules, is related to the material's relative: ---------CORRECT ANSWER-----------------Stiffness and yield strength. Which of the following materials is typically considered when the application only requires high compressive strength? ---------CORRECT ANSWER-----------------Cast iron. A fatigue failure can often be prevented by using NDT to: ---------CORRECT ANSWER-----------------Detect surface discontinuities that could be stress risers. Which of the following tests uses a pendulum to break a specimen that is notched and supported on both ends, with the results of measuring energy absorption? ---------CORRECT ANSWER-----------------Charpy test. What is a S-N curve? ---------CORRECT ANSWER-----------------An endurance limit curve diagram. Direct hardness test provide a measure of a material's ability to resist: ------- --CORRECT ANSWER-----------------Surface and near-surface penetration. Under ordinary usage, metals exist as: ---------CORRECT ANSWER---------- -------Crystalline solids.
The term body-centered cubic BCC, face-centered cubic FCC and hexagonal close-packed HCP all refer to the: ---------CORRECT ANSWER-- ---------------Lattice structures that make up unit cells in a solid metallic structure. The process of returning ductility to cold-worked low-carbon steel is called: ---------CORRECT ANSWER-----------------Recrystallization. Many metals exhibit an increase in strength caused by plastic flow beyond the elastic limit. This effect is called: ---------CORRECT ANSWER------------- ----Work hardening. When used as in-process treatment, Re crystallization can: --------- CORRECT ANSWER-----------------Improve ductility. Processes called austenitizing, annealing, normalizing and spheroidizing are: ---------CORRECT ANSWER-----------------Approximate equilibrium heat-treatment process. The term"precipitation hardening" is often used interchangeably with the term: ---------CORRECT ANSWER-----------------Age hardening. An NDT method that has the ability to measure changes in electrical conductivity caused by the effects of heat treatment is: ---------CORRECT ANSWER-----------------Eddy current.
The reduction of iron ore, by mixing with coke, limestone and oxygen for combustion of the coke, is accomplished in: ---------CORRECT ANSWER--- --------------A Blast furnace. In the iron and steel making process, the term pig iron refers to: --------- CORRECT ANSWER-----------------A high carbon, low ductility metal produced in the blast furnace that can be used to make subsequent types of iron and steel. Which of the following techniques is often used to speed up the steel making process? ---------CORRECT ANSWER-----------------Adding oxygen to the molten metal. Typically, the highest quality of steel is produced in: ---------CORRECT ANSWER-----------------An electric furnace. What percentage of carbon is found in steel: ---------CORRECT ANSWER-- ---------------Less than 2% By which of the following process is most of the world's steel produced: ----- ----CORRECT ANSWER-----------------Basic oxygen. An undesirable byproduct of steel making processes is: ---------CORRECT ANSWER-----------------Slag
A steel with 40 points of carbon contains: ---------CORRECT ANSWER------- ----------0.4 % carbon Corrosion resistant steels having relatively high percentages of nickel and chromium are called ---------CORRECT ANSWER-----------------Stainless steel Low carbon steel contains approximately: ---------CORRECT ANSWER------ -----------0.06 to 0.25% carbon Austenitic stainless steels are paramagnetic; this means that: --------- CORRECT ANSWER-----------------The material has a very low permeability. Which of the followingis an advantage of cast steel over wrought steels? --- ------CORRECT ANSWER-----------------Cast steels have more isotropic properties than wrought steel. Which of the following nonferrous metals is the most important structural material? ---------CORRECT ANSWER-----------------Aluminum alloys Which of the following statements is true regarding the electrical conductivity of aluminum alloys? ---------CORRECT ANSWER----------------- Conductivity decreases at elevated temperatures.
Thermosetting plastics do not soften, but char and deteriorate when reheated. Based on the strength to weight ratio: ---------CORRECT ANSWER----------- ------Some plastics, including nylon, may have strengths greater than some metals. Design engineers are responsible for establishing the function, appearance, quality and cost of a product. Regarding the role of NDT in product design, which of the following is true? ---------CORRECT ANSWER- ----------------Designer should seek input from NDT personnel to insure all required inspections can be performed. Manufacturing is a term that refers to processing that starts with raw material in bulk form and is concerned mainly with processing the raw material in a manner that changes its: ---------CORRECT ANSWER----------- ------Shape. Manufacturing process changes raw material by: ---------CORRECT ANSWER-----------------Machining. Which of the following is true regarding solidification of molten metal in a casting mold? ---------CORRECT ANSWER-----------------Cooling takes place in phases having different rates that produced different types of grain structures in different sections of the casting. In casting, shrinkage occurs: ---------CORRECT ANSWER----------------- Before, during and after the transformation from liquid to solid
Large voids or porosity in a casting result from: ---------CORRECT ANSWER-----------------Gas evolution before and during solidification. During the solidification of a casting, the shrinkage that occurs: --------- CORRECT ANSWER-----------------May cause cavities that are enlarged by the evolution of gases. The design of the casting is important because the quality of the finished product can be adversely affected by all of the following except: --------- CORRECT ANSWER-----------------Temperature of the mold immediately prior to casting. The design of the casting is important because the quality of the finished product can be adversely affected by all of the following. ---------CORRECT ANSWER-----------------1. Lack of molten metal to compensate for contraction.
- Location of gate with reference to either progressive solidification or directional solidification.
- The location of hot spots in ares of the casting that are isolated by thin sections. The term used to describe a discontinuity in a casting that occurs when molten metal interfaces with already solidified metal with failure to fuse at the interface is: ---------CORRECT ANSWER-----------------Cold shut.
Casting and molds made by covering a heated metal pattern with sand is mixed with particles of thermosetting plastic are called ---------CORRECT ANSWER-----------------Shell molds Permanent molds are most frequently made of ---------CORRECT ANSWER-----------------Metal Another term for precision casting and lost-wax process ---------CORRECT ANSWER-----------------Investment casting A casting process used to produce hollow products like large pipes and hollow shafts is ---------CORRECT ANSWER-----------------Centrifugal casting A casting process used to produce elongated shapes by drawing solidified metal from a water-cooled mold backed by molten metal is --------- CORRECT ANSWER-----------------Continuous casting An assembly that has been created by joining two or more parts by one or more welds is called ---------CORRECT ANSWER-----------------Weldment A general definition of welding describes the joining of two surfaces --------- CORRECT ANSWER-----------------In a permanent union established by atom-to-atom bonds
Of the following, which is required for fusion bonding ---------CORRECT ANSWER-----------------Melting. Atomic closeness. Atomic cleanliness. Metallurgical effects in a weld, such as grain size variation and shrinkage, are similar to those that occur in ---------CORRECT ANSWER----------------- Castings Pressure wielding can be accomplished with pressure alone, but what else is usually added ---------CORRECT ANSWER-----------------Heat Proper brazing depends upon numerous factors being controlled. --------- CORRECT ANSWER-----------------Proper joint fit-up and joint prep. Adequate heat to melt the braze filler metal. Selection of proper braze filler metal. Soldering, brazing and braze welding all ---------CORRECT ANSWER-------- ---------Use a process where only the filler metal is actually melted Due to high temperatures and rapid rate of cooling, the filler material used in fusion welds ---------CORRECT ANSWER-----------------Contains alloys that will help compensate for properties lost during the welding process
CORRECT ANSWER-----------------The burning of coatings on the welding electrode. Maintaining the arc beneath flux powders. The flow of a shielding gas around the arc. The burn-off rate and amount of spattering during the arc welding process can often be controlled by ---------CORRECT ANSWER----------------- Selecting the proper electrode polarity Which of the following welding process uses a nonconsumble electrode with the arc maintained in a atmosphere of inert gas ---------CORRECT ANSWER-----------------Gas tungsten arc welding Shielding in the submerged arc welding process is provided by --------- CORRECT ANSWER-----------------Granular flux that completely surrounds the arc. A welding process that is most frequently carried out in a vacuum chamber is ---------CORRECT ANSWER-----------------Electron-beam welding The welding process capable of very high intensity and rate of heat transfer is ---------CORRECT ANSWER-----------------Plasma arc welding The welding process in which the arc is extinguished after melting a slag cover and in which the base metal and copper slides form a sort of moving mold is called ---------CORRECT ANSWER-----------------Electroslag welding
In the process of diffusion welding, often called diffusion bonding, the base metal is joined by ---------CORRECT ANSWER-----------------Putting it under pressure at temperatures below the melting point A slag inclusion can result from which of the following ---------CORRECT ANSWER-----------------Insufficient cleaning of successive passes in a multipass weldment. Undercut on a weld pass is usually caused by ---------CORRECT ANSWER-----------------Poor operator technique. Crater cracks may take the form of a single crack or star-shaped cracks and will usually be found ---------CORRECT ANSWER----------------- Anywhere along the weld where the welding was stopped and restarted. The principal purpose of preheat treatment and post-heat treatment in welds is to ---------CORRECT ANSWER-----------------Neutralize residual stresses and geometric distortion. In welding the most obvious defects are those associated with structural discontinuities in the weld itself. Conditions not considered welding process defects are ---------CORRECT ANSWER-----------------Corrosion of the structural members Cracks in the weld metal are primarily of which three types --------- CORRECT ANSWER-----------------Longitudinal, transverse and crater.
