eng materials final
Which of the following are reasons why mechanical assembly is often preferred over other forming processes (two best answers): (a) ease of assembly, (b) ease of disassembly, (c) economies of scale, (d) involves melting of the base parts, (e) no heat affected zone in the base parts, and (f) specialization of labor?
(a) ease of assembly, (b) ease of disassembly
Use of a parison is associated with which one of the following plastic shaping processes? (a) bi-injection molding (b) blow molding (c) compression molding (d) pressure thermoforming (e) sandwich molding
blow molding
Which of the following processes are generally limited to thermoplastic polymers? (2) (a) blow molding (b) compression molding (c) reaction injection molding (d) thermo-forming (e) transfer molding (f) wire coating
blow molding, thermo forming
A fillet weld can be used to join which of the following joint types (three correct answers): (a) butt, (b) corner, (c) edge, (d) lap, and (e) tee
b,d,e
Which of the following are classified as forging operations (four correct answers)
coining, fullering, swagging, upsetting
Which of the following are advantages and characteristics of hot working relative to cold working (four correct answers): (a) fracture of workpart is less likely, (b) friction is reduced, (c) increased strength properties, (d) isotropic mechanical properties, (e) less overall energy is required, (f) lower deformation forces is required, (g) more significant shape changes are possible, and (h) strain-rate sensitivity is reduced?
fracture of workpart is less likely isotropic mechanical properties lower deformation forces required more significant shape changes possible
Which of the following casting processes are expendable-mold operations (four correct answers): (a) centrifugal casting, (b) die casting, (c) investment casting, (d) low pressure casting, (e) sand casting, (f) shell molding, (g) slush casting, and (h) vacuum molding?
investment casting,sand casting, shell molding
30.6 Which of the following are advantages of brazing compared to fusion welding (three best answers): (a) annealing of the base parts is a by-product of the process, (b) dissimilar metals can be joined, (c) less heat and energy required, (d) metallurgical improvements in the base metals, (e) multiple joints can be brazed simultaneously, (f) parts can be readily disassembled, and (g) stronger joint than welding?
multiple joints can be brazed simultaneously,less heat and energy required,dissimilar metals can be joined
Which one of the following casting processes is the most widely used: (a) centrifugal casting, (b) die casting, (c) investment casting, (d) sand casting, or (e) shell casting?
sand casting
The cutting force in a sheet-metal blanking operation depends on which mechanical property of the metal (one correct answer): (a) compressive strength, (b) modulus of elasticity, (c) shear strength, (d) strain rate, (e) tensile strength, or (f) yield strength?
shear strength
30.1 Adhesively bonded joints are strongest under which type of stresses (two best answers): (a) cleavage, (b) peeling, (c) shear, and (d) tension?
tension, shear
Most externally threaded fasteners are produced by which one of the following processes: (a) cutting the threads, (b) milling the threads, (c) tapping, (d) thread rolling, or (e) turning the threads?
(d) thread rolling
The average flow stress is the flow stress multiplied by which of the following factors? (a) n (b) b(1+n) (c) 1/n (d) 1/(1+n) where n is the strain-hardening exponent
1/(1+n)
Metals that are easiest to weld in resistance welding are ones that have low resistivities since lowresistivity assists in the flow of electrical current: (a) true or (b) false?
FALSE
Which one of the following arc welding processes uses a nonconsumable electrode: (a) FCAW, (b)GMAW, (c) GTAW, or (d) SMAW?
GTAW
"Stick" welding is a term sometimes applied when referring to which one of the followingprocesses: (a) FCAW, (b) GMAW, (c) GTAW, or (d) SMAW?
SMAW
Most sheet metalworking operations are performed as which one of the following: (a) cold working, (b) hot working, or (c) warm working?
a
Which of the following bulk deformation processes are involved in the production of nails for lumber construction (three best answers): (a) bar and wire drawing, (b) extrusion, (c) flashless forging, (d) impression die forging, (e) rolling, and (f) upsetting?
a,c,d
Which of the following are sections of a conventional extruder barrel for thermoplastics? (3) (a) compression sections (b) die section (c) feed section (d) heating section (e) metering section (f) shaping section
a,c,e
Advantages of snap fit assembly include which of the following (three best answers): (a) components can be designed with features to facilitate part mating, (b) ease of disassembly, (c) no heat affected zone, (d) no special tools are required, (e) parts can be assembled quickly, and (f) stronger joint than with most other assembly methods?
a,d,e
The heat transfer factor in welding is correctly defined by which one of the following descriptions: (a) the proportion of the heat received at the work surface that is used for melting, (b) the proportion of the total heat generated at the source that is received at the work surface, (c)the proportion of the total heat generated at the source that is used for melting, or (d) the proportion of the total heat generated at the source that is used for welding?
b
Which of the following are alternative names for indirect extrusion (two correct answers)
backward extrusion, reverse extrusion
Which one of the following surface-hardening treatments is the most common? (a) boronizing (b) carbonitriding (c) carburizing (d) chromizing (e) nitriding
c
Turbulence during pouring of the molten metal is undesirable for which of the following reasons(two best answers): (a) it causes discoloration of the mold surfaces, (b) it dissolves the binder used to hold together the sand mold, (c) it increases erosion of the mold surfaces, (d) it increases the formation of metallic oxides that can become entrapped during solidification, (e) it increases the mold filling time, and (f) it increases total solidification time?
c,d
A riser in casting is described by which of the following (three correct answers): (a) an insert in thecasting that inhibits buoyancy of the core, (b) gating system in which the sprue feeds directly intothe cavity, (c) metal that is not part of the casting, (d) source of molten metal to feed the casting andcompensate for shrinkage during solidification, and (e) waste metal that is usually recycled?
c,d,e
Which one of the following stamping dies is the most complicated: (a) blanking die, (b) combination die, (c) compound die, (d) edge-bending die, (e) progressive die, or (f) V-bending die?
e
Investment casting is also known by which one of the following names: (a) fast-payback molding, (b) full-mold process, (c) lost-foam process, (d) lost-pattern process, or (e) lost-wax process?
lost wax process
Which of the following rolling mill types are associated with relatively small diameter rolls in contact with the work (two correct answers): (a) cluster mill, (b) continuous rolling mill, (c) four-high mill, (d) reversing mill, and (e) three-high configuration?
(a) cluster mill, (c) four-high mill
Which of the following are considered good product design rules for automated assembly (two best answers): (a) design the assembly with the fewest number of components possible, (b) design the product using bolts and nuts to allow for disassembly, (c) design with many different fastener types to maximize design flexibility, (d) design parts with asymmetric features to mate with other parts having corresponding (but reverse) features, and (e) limit the required directions of access when adding components to a base part?
(a) design the assembly with the fewest number of components possible (e) limit the required directions of access when adding components to a base part
The two most common polymer foams are which of the following? (2) (a) polyacetal (b) polyethylene (c) polystyrene (d) polyurethane (e) polyvinylchloride
polystyrene, polyurethane
Which of the following metals would typically be used in die casting (three best answers): (a) aluminum, (b) cast iron, (c) steel, (d) tin, (e) tungsten, and (f) zinc?
aluminum,tin,zinc
In brazing, the base metals melt at temperatures above 840F (450C) while in soldering they melt at 840F (450C) or below: (a) true or (b) false?
false
Which of the following are the common ways in which threaded fasteners fail during tightening (two best answers): (a) excessive compressive stresses on the head of the fastener because of force applied by the tightening tool, (b) excessive compressive stresses on the shank of the fastener, (c) excessive shear stresses on the shank of the fastener (d) excessive tensile stresses on the head of the fastener because of force applied by the tightening tool, (e) excessive tensile stresses on the shank of the fastener, and (f) stripping of the internal or external threads?
e,f
Which of the following processes are classified as fusion welding (three correct answers): (a)electrogas welding, (b) electron-beam welding, (c) explosion welding, (d) forge welding, (e) laserbeamwelding, and (f) ultrasonic welding?
electrogas welding,electron-beam welding, laserbeamwelding,
Which of the following are bulk deformation processes (three correct answers): (a) bending, (b) deep drawing, (c) extrusion, (d) forging, (e) rolling, and (f) shearing?
extrusion, forging, rolling
The treatment in which the brittleness of martensite is reduced is called which one of the following? (a) aging (b) annealing (c) austenitizing (d) normalizing (e) quenching (f) tempering
f
A misrun is which one of the following defects in casting: (a) globules of metal becoming entrapped in the casting, (b) metal is not properly poured into the downsprue, (c) metal solidifies before filling the cavity, (d) microporosity, and (e) "pipe" formation?
metal solidifies before filling the cavity
In a sheet-metal-cutting operation used to produce a flat part with a hole in the center, the part itself is called a blank, and the scrap piece that was cut out to make the hole is called a slug: (a) true or (b) false
true
The melting factor in welding is correctly defined by which one of the following descriptions: (a) the proportion of the heat received at the work surface that is used for melting, (b) the proportion of the total heat generated at the source that is received at the work surface, (c) the proportion of the total heat generated at the source that is used for melting, or (d) the proportion of the total heat generated at the source that is used for welding?
a
The upper half of a sand-casting mold is called which of the following: (a) cope or (b) drag?
a
Total solidification time is defined as which one of the following: (a) time between pouring and complete solidification, (b) time between pouring and cooling to room temperature, (c) timebetween solidification and cooling to room temperature, or (d) time to give up the heat of fusion?
a
In precipitation hardening, the hardening and strengthening of the metal occurs in which one of the following steps? (a) aging (b) quenching (c) solution treatment
aging
Which of the following metals are used in solder alloys (four correct answers): (a) aluminum, (b) antimony, (c) gold, (d) iron, (e) lead, (f) nickel, (g) silver, (h) tin, and (i) titanium?
antimony,tin,lead,silver
The amount of heat required to melt a given volume of metal depends strongly on which of the following properties (three best answers): (a) coefficient of thermal expansion, (b) heat of fusion, (c) melting temperature, (d) modulus of elasticity, (e)specific heat, (f) thermal conductivity, and (g) thermal diffusivity?
b,c,e
Which of the following casting processes are permanent-mold operations (three correct answers): (a) centrifugal casting, (b) die casting, (c) expanded polystyrene process, (d) sand casting, (e) shell molding, (f) slush casting, and (g) vacuum molding.
centrifugal casting, die casting, slush casting
Which one of the following is not a function of a flux in brazing or soldering: (a) chemically etch the surfaces to increase roughness for better adhesion of the filler metal, (b) promote wetting of the surfaces, (c) protect the faying surfaces during the process, or (d) remove or inhibit formation of oxide films?
chemically etch the surfaces to increase roughness for better adhesion of the filler metal
The principal components of an injection molding machine are which two of the following? (2) (a) clamping unit (b) hopper (c) injection unit (d) mold (e) part ejection unit
clamping unit, injecting unit
On which one of the following metals is the treatment called austenitizing be performed? (a) aluminum alloys (b) brass (c) copper alloys (d) steel
d
The function of the injection system is which one of the following? (a) more polymer melt into the mold cavity (b) open the mold halves after the cavity is filled (c) remove the molded parts from the runner system after molding (d) separate the part from the cavity after molding
d
Which one of the following is the best definition of bend allowance: (a) amount by which the die is larger than the punch, (b) amount of elastic recovery experienced by the metal after bending, (c) safety factor used in calculating bending force, or (d) length before bending of the straight sheet metal section to be bent?
d
4 Which of the following processes are classified as solid-state welding (three correct answers): (a)diffusion welding, (b) friction stir welding, (c) resistance spot welding, (d) roll welding, (e) thermitwelding, and (f) upset welding?
diffusion , friction stir, and roll welding
