MP
In figure 1, the points represented be E and F would be closer together if the material being tested were: A. Loaded in tension. B. Loaded in lapshea[ C. More ductile. D. Less ductile.
D. Less ductile.
What percentage of carbon is found in steel? A. Between 3% and 4%. B. Between 2% and 3%. C. Less than 0.2%. D. Less than 2%.
D. Less than 2%.
Spheroidizing and normalizing have the effect of: A. Increasing ductility. B. Age hardening. C. Reducing the grain size. D. Causing a phase change.
A. Increasing ductility.
Another term for precision casting and the lost-wax process is: A. Investment casting. B. Die casting. C Metal mold casting D. Shell mold casting.
A. Investment casting
All of the following are casting defects except A. Laminations. B. Segregation. C Hot tears. D. Porosity.
A. Laminations.
Manufacturing processes change raw material by: A. Machining. B. Stress relieving. C. Case hardening. D. Electroplating.
A. Machining.
Which of the following metal alloys has a density approximately two-thirds that of aluminum? A. Magnesium. B. Beryllium. C Copper D. Nickel
A. Magnesium.
Which of the following techniques id often used to speed up the steel-making process? A. Adding large amounts of carbon to the molten metal. B. Reducing the amount of scrap steel that is often added to the molten metal. C. Adding oxygen to the molten metal. D. Converting the old open-hearth furnaces into electric furnaces.
C. Adding oxygen to the molten metal.
Which of the following materials cannot typically be used in the as-cast state? A. Aluminum. B. Zinc. C. Carbon. D. Iron.
C. Carbon.
Which of the following materials is typ ically considered when the application only requires high compressive strength? A. Low carbon steel. B. High carbon stee l. C. Cast iron. D. Magnesium.
C. Cast iron.
Small metal supports used to support and position cores become part of a casting by fusing with the molten metal. Such devices are called: A. Core hangers. B. Chills. C. Chaplets. D. Risers.
C. Chaplets.
Which of the following is not classified a method of hardness testing? A. Brinnel. B. File test. C. Charpy. D. Moh's.
C. Charpy.
Brasses and Bronzes are alloys of: A. Magnesium B. Tin. C. Copper. D. Aluminum.
C. Copper.
Mold material in the form of inserts that exclude metal flow and thus form internal surfaces or passages in a casting are called: A. Chills. B. Chaplets. C. Cores. D. Patterns.
C. Cores.
Most solid meta ls and plastics that have reasonable strength at room temperature are called: A. Composite materials. B. Manufacturing materials. C. Allotropic materia ls. D. Engineering materials.
D. Engineering materials.
"Manufacturing" is a term that refers to processing that starts with raw material in a bulk form and is concerned mainly with processing the raw material in a manner that changes its: A Shape. B. Chemical form. C. Mechanical properties. D. Physical properties.
A Shape.
The reduction of iron ore, by mixing with coke, limestone, and oxygen for combustion of the coke, is accomplished in: A. A blast furnace. B. An open-hearth furnace. C. A Bessemer converter. D. A basic oxygen furnace.
A. A blast furnace.
The term "precipitation hardening" is often used interchangeably with the term: A. Age hardening. B. Recrystallization. C. Annealing. D. Work hardening.
A. Age hardening.
Which of the following is classified as a "light" metal? A. Aluminum. B. Steel. C. Copper. D. All of the above.
A. Aluminum.
Typically, the highest quality of steel is produced in: A. An electric furnace. B. An open-hearth furnace. C. A Bessemer furnace. D. A basic oxygen furnace.
A. An electric furnace.
Which of the fo llowing statements is true concerning composite materia ls? A. Composite materials can be wrapped over metallic materials to increase strength and reduce weight. B. When composite materials are cured, the constituents lose their original identity and form chemical compounds with one another. C. A unique feature of composite materials is that their tensile strength frequent ly exceeds the strength of the toughest constituent. D. Composites are usually formed into complex three-dimensional shapes with each dimension approximately equal to the other two.
A. Composite materials can be wrapped over metallic materials to increase strength and reduce weight.
Of the following material properties, all are classified as mechanical properties except: A. Corrosion resistance. B. Ductility. C. Hardness. D. Strength.
A. Corrosion resistance.
Which of the following tests subjects a test sample to repeated stresses in order to determine the number of cycles required to cause failure? A. Fatigue Testing. B. Transverse Rupture Testing. C. Shear Testing. D. Creep Testing.
A. Fatigue Testing.
When used as in-process treatment, recrystallization. A. Improve ductility. B. En large grains. C. Increase hardness. D. Passivate the surface
A. Improve ductility.
The major difference between materials classified as composites and those classified as mixtures is that: A. Mixtures are a type of composite with random orientation and shape of the constituents. B. Composites contain metallic constituents and mixtures are nonmetal lie. C. Mixtures start as liquid blended together and composites start as solids. D. Mixtures are elastomeric, while composites are characterized as having at least one plastic component.
A. Mixtures are a type of composite with random orientation and shape of the constituents.
Monel™ and lnconel™ are: A. Nickel alloys. B. Steel alloys. C. Magnesium alloys. D. Aluminum alloys.
A. Nickel alloys.
Which of the fo llowing statements is true concern ing honeycomb? A. Nonmetallic honeycomb derives high strength and rigidity from a structural combination of relatively weak, thin lightweight materials. B. In honeycomb, the walls of the cellular core material are aligned parallel with the plane of the face sheets. C. Honeycomb containing nonmetallic elements can be bonded by adhesives, brazing or diffusion welding. D. Honeycomb combining metallic and nonmetallic elements cannot be used in cryogenic service due to the permeability of the nonmetallic elements.
A. Nonmetallic honeycomb derives high strength and rigidity from a structural combination of relatively weak, thin lightweight materials.
Green sand casting molds include: A. Sand, clay and water. B. Sand, wax and solvent. C. Sand, refractory metals and water. D. Sand, carbon and green clay.
A. Sand, clay and water.
Reinforced plastic molding involves use of: A. Thermosetting plastics and fibrous reinforcement materials. B. Thermosetting plastics and metallic powder reinforcement. C. Thermoplastics and wood fiber reinforcement materials. D. Thermoplastics and metallic powder reinforcement
A. Thermosetting plastics and fibrous reinforcement materials.
Low-carbon steel contains approximately: A. 0.6 to 2.5% carbon. C. 0.5 to 1.6% carbon. D. 5 to 16% carbon.
B. 0.06 to .25% carbon.
In the iron- and steel-making process, the term" pig iron" refers to: A. The waste material that contains high concentrations of impurities and slag and is either discarded or used as a byproduct. B. A high-carbon, low-ductility metal produced in the blast furnace that can be used to make subsequent types of iron and steel. C The molten metal from the blast furnace that is not usable and is poured off into a series of crude castings called "pigs" D. Low-cost metal used in large production factories.
B. A high-carbon, low-ductility metal produced in the blast furnace that can be used to make subsequent types of iron and steel.
Figure 2 typifies: A. A creep test curve. B. An S-N curve. C. A stress-strain diagram. End Now D. A true stress-strain diagram.
B. An S-N curve.
Which of the following heat treatment processes is performed to reduce steel to its softest condition? A. Austenitization. B. Annealing. C. Spheroidizing. D. Normalizing.
B. Annealing.
Processes cal led austenitizing, annealing, normalizing and spheroidizing are: A. Performed on ly on nonferrous metals. B. Approximate equilibrium heat-treatment processes. C. Cold-working processes. D. Age-working processes
B. Approximate equilibrium heat-treatment processes.
Which of the fo llowing statements is true regard ing plastics processing? A. Unlike metals, plastics must be processed without the addition of heat. B. Both thermoplastics and thermosetting plastics may be processed by molding, casting and extrusion. C. All plast ic molding processes use liquid-state materials introduced into the mold cavity. D. Injection molding can be done only with thermosetting materials.
B. Both thermoplastics and thermosetting plastics may be processed by molding, casting and extrusion.
The heat treatment of aluminum for the purpose of hardening and strengthening: A. Is not possible with aluminum alloys because they contain no carbon and cannot undergo allotropic changes. B. Can produce tensile strengths equivalent to some carbon steels. C. Requires the use of special furnaces and is rarely done as a practical applicati on. D. Requires that iron and carbon be alloyed for the best results.
B. Can produce tensile strengths equivalent to some carbon steels.
Which of the following is an advantage of cast steel over wrought steels? A. Cast steels usually have higher mechanical properties than wrought steels. B. Cast steels have more isotropic properties than wrought steels. C. Cast steels are more corrosion-resistant than wrought steels. D. Cast steels cannot be heat-treated, and are thus less expensive to produce than wrought steels.
B. Cast steels have more isotropic properties than wrought steels.
Which of the following tests uses a pendulum to break a specimen that is notched and supported on both ends, with the result of measuring energy absorption? A. Creep test. B. Charpy test. C. Fatigue test. D. Transverse rupture test
B. Charpy test.
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: A. Hot tear. B. Cold shut. C. Lack of fusion. D. Segregation.
B. Cold shut.
A casting process used to produce elongated shapes by drawing solidified metal form a water-cooled mold backed by molten metal is: A. Centrifugal casting. B. Continuous casting. C. Draw casting. D. Extrusion
B. Continuous casting.
Which of the following is true regarding solidification of molten metal in a casting mold? A. The metal cools at a constant rate, thus providing fine equiaxed grains throughout. B. Cooling takes place in phases having different rates that produce different types of grain structure in different sections of the casting. C. Solidification occurs at a constant rate, beginning at the interior of the casting and progressing outward. D. Thick sections tend to cool more rapidly than thin sections because thin sections consist mostly of fine equiaxed grains.
B. Cooling takes place in phases having different rates that produce different types of grain structure in different sections of the casting.
Brass and bronze are alloys of zinc, tin and a large percentage of: A. Beryllium. B. Copper C. Lead. D. Nickel.
B. Copper
Attacks on metals by direct chemical action and/or electrolysis are called: A. Rust. B. Corrosion. C. Austenitic transformations. D. Galvanization
B. Corrosion.
A fatigue failure can often be prevented by using NOT to: A. Verify the cyclic loading on a component part. B. Detect surface discontinuities that could be stress risers. C. Measure the endurance limit of a part undergoing cyclic stresses. D. Determine percent elongation of a material before it is placed in service.
B. Detect surface discontinuities that could be stress risers.
In Figure 1, point A is called the: A. Elastic range. B. Elastic limit C. Yield point End Now D. Modulus of elasticity.
B. Elastic limit
In which of the following casting processes is the pattern destroyed during casting? A. Die casting. B. Investment casting. C. Precision casting. D. Sand casting.
B. Investment casting
Which of the following is true relative to the comparison of the properties of aluminum based alloys and iron-based alloys? A. Iron has a lower melting point than aluminum. B. Iron can exist is several different crystalline structures, and its properties can be controlled by heat treatment. C Iron can be alloyed to increase its strength, whereas aluminum is strongest in its pure state. D. Iron is preferred in load carrying designs, but it should not be used for any deformation type of manufacturing process.
B. Iron can exist is several different crystalline structures, and its properties can be controlled by heat treatment.
A drawback of using magnesium is its: A. Low corrosion resistance. B. Low impact strength. C. High density. D. Low conductivity
B. Low impact strength.
Material properties, as used in design, are most frequently determined by: A. Theoretical ana lysis. B. Materials testing C. The National Institute of Standards and Technology (NIST). D. Fracture mechanics testing.
B. Materials testing
An absence of molten metal during the final solidification process is the cause of which of the following casting defects? A. Inclusions. B. Pipe. C. Cold shuts. D. Blowholes
B. Pipe.
The elimination of deformed grains after plastic deformation can be accomplished by: A. Stress re lief. B. Recrystallization. C. Recovery. Score: D. All of the above.
B. Recrystallization.
The process of returning ductility to a cold-worked low-ca rbon steel is ca lled: A. Precipitation. B. Recrystallization. C. Allotrop ic change. D. Austenitization.
B. Recrystallization.
Based on the strength-to-weight ratio: A. No plastic materials can compare with metals. B. Some plastics, includ ing nylon, may have strengths greater than some steels. C. Plastics, as a group, are superior in strength to most ferrous metals. D. Plastics, being chemically inert, retain their strength longer than carbon steels in corrosive environments.
B. Some plastics, includ ing nylon, may have strengths greater than some steels.
Direct hardness test provide a measure of a material's ability to resist: A. Bending. B. Surface and near-surface penetration. C. Tensile stresses. D. Elongation.
B. Surface and near-surface penetration.
Even at the early stages of product planning, NOT should be considered because: A. Codes and specifications are too restrictive. B. The design of the part should permit easy access to critica l areas for later inspection C. The NOT method may damage the product. 0. The NOT processes generally take longer than other processes.
B. The design of the part should permit easy access to critica l areas for later inspection
Which of the following pl astic types may not be remolded? A. "Heat-fiowable" polymers. B. Thermosets. C. Linear-chain polymers. D. Thermoplastics.
B. Thermosets.
Which of the following statements is true concerning plastics following their initial polymerization? A. Thermoplastics harden when reheated. B. Thermosetting plastics do not soften, but char and deteriorate when reheated. C. All plastics are synthetic and contain no natural materials. D. Plastics have complex molecular structure, making it expensive to bind with other materials.
B. Thermosetting plastics do not soften, but char and deteriorate when reheated.
In a casting, shrinkage occurs: A. Only after the transformation from liquid to solid. B. Only during the transformation from liquid to solid. C Before, during and after the transformation from liquid to solid D. Only when the metal is in the liquid state.
C Before, during and after the transformation from liquid to solid
In which type of casting process is the liquid metal injected into the mold? A. Permanent mold casting. B. Sand casting. C Die casting D. Investment casting.
C Die casting
During the so lidification of a casting, the shrinkage that occurs: A. May cause porosity and shrinkage cavities primarily in the outer surfaces where the metal cools first. B Requires that the pattern used be slightly smaller than the desired dimension of the finished casting C May cause cavities that are enlarged by the evolution of gases. D. May be eliminated by investment casting.
C May cause cavities that are enlarged by the evolution of gases.
Permanent molds are most frequently made of: A. Ceramics. B. Fused sand and plastic. C Metal D. Plaster.
C Metal
A high-strength, low-density, corrosion-resistant metal alloy of significance in the aircraft, marine and chemical processing industries is: A. Tungsten. B. Zinc. C Titanium. D. Magnesium
C Titanium.
Which of the following metals has low strength, high corrosion resistance and is used largely in die-casting operations? A. Aluminum. B. Magnesium. C Zinc. D. Manganese.
C Zinc.
A steel with 40 points of carbon contains: A. 40% carbon. B. 4% carbon. C. 0.4% carbon. D. 0.04% carbon.
C. 0.4% carbon.
A bar that is 305 mm (12 in.) long, 51 mm (2 in.) wide, and 25 mm (1 in.) thick is subjected to a tensile load acting along the length of the bar of 16 329 kg (36 000 lbs.). What is the tensile stress within the bar? A. 10 335 kPa (1500 psi). B. 82 680 kPa (12 000 psi). C. 124 020 kPa (18 000 psi). D. 248 040 kPa (36 000 psi).
C. 124 020 kPa (18 000 psi)
Large voids or porosity in a casting result from: A. Turbulent flow of the molten metal during pouring. B. Alloy element segregation. C. Molten metal boiling because of superheat. D. Gas evolution before and during solidification
D. Gas evolution before and during solidification
Factors of safety are often in the range of 2 to 4. These factors; A. Are provided for engineering mistakes. B. Are added as a corrosion allowance. C. Could be reduced with the assurance of NDT techniques that the material was free of discontinuities. D. Provide allowances for poor welding techniques.
C. Could be reduced with the assurance of NDT techniques that the material was free of discontinuities.
Under ordinary usage, metals exist as: A. Amorphous solids. B. Mixtures and compounds of iron and carbon. C. Crystalline solids. D. Face-centered cubic lattices.
C. Crystalline solids.
An NOT method that has the ability to measure changes in electrical conductivity caused by the effects of heat treatment is: A. Magnetic particle testing. B. Acoustic emission testing. C. Eddy current testing. D. Immersion ultrasonic testing
C. Eddy current testing.
Which of the following does not help prevent corrosion. A. Stress re lieving. B. Anodizing. C. Insulating. D. Electroplating.
C. Insulating.
Which of the following may cause a discontinuity even though its intended purpose is to prevent shrinkage cavities by absorbing heat from the molten metal in the center of the casting? A. Riser. B. Core. C. Internal chill. D Chaplet
C. Internal chill.
The terms body-centered cubic, face-centered cubic and hexagonal close-packed all refer to the: A. Different size grains that can exist at the same time in a metallic structure. B. Sequence of crysta ll ine growth in a typica l mild steel. C. Lattice structures that make up unit cells in a sol id metallic structures that make up unit cells in a solid metallic structure. D. Change in a metallic structure as it undergoes plastic deformation.
C. Lattice structures that make up unit cells in a sol id metallic structures that make up unit cells in a solid metallic structure.
Which of the following NOT methods can be commonly used to inspect castings for core shift and none fused chaplets and used to determine that all core materials have been removed? A. Ultrasonic testing. B. Magnetic partic le testing. C. Radiographic testing. D Electromagnetic testing.
C. Radiographic testing.
Anneal ing is usua lly performed to: A. Increase hardness. B. Reduce corrosion. C. Relieve stresses. D. Increase conductivity.
C. Relieve stresses.
When precipitation hardening nonferrous metals, what is the sequence of steps that is required? A. Aging, solution heat treating, quenching. B. Quenching, aging, solution heat treating. C. Solution heat treating, quenching, aging. D. Solution heat treating, carburizing, aging.
C. Solution heat treating, quenching, aging.
Corrosion-resistant steels having relatively high percentages of nickel and chromium are called: A. Wrought iron. B. Low-alloy steels. C. Stainless steels. D. Nonferrous steels.
C. Stainless steels.
Martensitic, Ferritic, and Austenitic all refer to what type of steel? A. Alloy. B. Tool. C. Stainless. D. Carbon.
C. Stainless.
Many metals exhibit an increase in strength caused by plastic flow beyond the elastic limit. This effect is ca lled: A. Twinning. B. Plastic deformation. C. Work hardening. D. Age hardening.
C. Work hardening.
In fi gure 3, which letter describes the "triple point" of the material? A B C D
D
A particular type of steel has an ultimate strength of 551 200 kilopascals (kPa) (80000 pounds per square inch [psi]), an elastic limit of 413 400 kPa (60 000 psi) and a yield strength of 427 180 kPa (62 000 psi). An al lowable design stress of 137 800 kPa (20 000 psi) is used. What is the factor of safety based on the ultimate strength? A. 0.25. B. 0.33. C. 3.0. D. 4.0.
D. 4.0
Which of the following is a type of fiber used in the manufacture of composite materials? A. Glass. B. Boron. C. Aramid. D. All of the above.
D. All of the above.
Which of the following nonferrous metals is the most important structural material? A. Copper alloys. B. Nickel alloys. C. Zinc alloys. D. Aluminum alloys.
D. Aluminum alloys.
By which of the following processes is most of the world's steel produced? A. Bessemer converter. B. Electric furnace. C. Open hearth. D. Basic oxygen
D. Basic oxygen
A casting process used to produce hollow products like large pipes and hollow shafts is: A. Investment casting. B. Blow casting. C. Core casting. D. Centrifugal casting.
D. Centrifugal casting.
Which of the follow ing tests use a weighted pendulum to break the specimen under test? A. Brinnel. B. Rockwell. C. Tensile. D. Charpy
D. Charpy
Which of the following material properties are of most concern if corrosion resistance is essential? A. Processing properties. B. Mechanical properties. C. Physical properties. D. Chemical properties.
D. Chemical properties.
Which of the following statements is true regarding the electrical conductivity of aluminum alloys? A. Most aluminum alloys are in the range of 70% to 96% IACS. B. Clad aluminum takes on the conductivity of the base metal. C. Each basic wrought aluminum al loy has a conductivity distinct from any other. D. Conductivity decreases at elevated temperatures.
D. Conductivity decreases at elevated temperatures.
maximum caused by plastic flow of the material during a tensile load? A. A-B. B. B-C. C. C- D. D-E
D. D-E.
. Design engineers are responsible for establish ing the function, appearance, qua lity and cost of a product. Regarding the role of NOT in product design, which of the following is true? A As a group, designers (by their training and education) are adequately informed about NOT to establish NOT procedures and acceptance criteria. B. When NOT appears necessary in a design, the designer should properly select the methods and techniques to be used by reference to NOT handbooks. C. Designers should depend solely upon NOT personnel to establish acceptance criteria. D. Designers seek input from NOT personnel to ensure all required inspections can be performed
D. Designers seek input from NOT personnel to ensure all required inspections can be performed.
When dendrite growth is restricted by an adjacent dendrite, the result is the formation of a: A. Hot spot. B. Crystal lattice. C. Nucleation point. D. Grain boundary
D. Grain boundary
The part of the casting where the gate or riser was attached: A. Should be the area used to establish reference standards for future NOT examinations because this area will contain the best qua lity cast material. B. Provides the best quality material because of rapid cooling in this area. C. Should be the area the "freezes' first, thus preventing excessive shrinkage cavities. D. May provide a concentration point for discontinuities.
D. May provide a concentration point for discontinuities.
During solidification, segregation within or around the grains themselves is termed: A. Cluster segregation. B. Macro segregation. C. Dross. Score: D. Micro segregation
D. Micro segregation
An undesirable byproduct of steel-making processes is: A. Coke. B. Low-carbon steel. C. Low-a lloy steel. D. Slag.
D. Slag.
The module od elasticity, or Young's modulus, is related to the material's relative: A. Ten si le strength. B. Compressive strength. C. Resistance to stress. D. Stiffness and yield strength
D. Stiffness and yield strength
Metal corrosion that is accelerated when the metal is under loads is called: A. Pitting corrosion. B. Galvanic corrosion. C. Electrochemical corrosion. D. Stress corrosion
D. Stress corrosion
The design of the casting is important because the quality of the finished product can be adversely affected by all of the following except: A. Lack of molten metal to compensate for contraction. B. Location of the gate with reference to either progressive solidi fi cat ion or directional solidification. C. The location of "hot spots" in areas of the casting that are isolated by thin sections. D. Temperature of the mold immediately prior to casting.
D. Temperature of the mold immediately prior to casting.
When a steel has been quench-hardened and then reheated to some point below the lower transformation temperature for the purpose of reducing brittleness, this is called: A. Austenitization. B. Thermal slip deformation. C. Al lotropic change. D. Tempering.
D. Tempering.
Austenitic stainless steels are paramagnetic; this means that: A. Alternating current must be used when using the magnetic parti cle test ing method. B. The steel is very dense and, relative to other steels, difficu lt to penetrate with X-rays. C. Ultrasonics is logical NDT method to choose because of the coarse-grained nature of a paramagnetic material. D. The material has a very low permeability.
D. The material has a very low permeability.
The mechanism of adhesion combines mechanical interlocking and: A. Stickiness of the adhesive. B. Roughness of the adherends. C. Dynamic mechanical forces. D. lnteratomic forces.
D. lnteratomic forces.
Tensile tests are conducted on specimens from a newly developed alloy in order to determine the ultimate tensile strength of the material. Such tests are referred to as: A. Indirect tests. B. Physical properties tests. C. Destructive tests. D. Acoustic emission tests.
Destructive tests.
