INEN 3322 Materials Process Final
Impregnation refers to which of the following (two best answers): (a) filling the pores of the PM part with a molten metal, (b) putting polymers into the pores of a PM part, (c) soaking oil by capillary action into the pores of a PM part (d) something that should not happen in a factory?
(b) putting polymers into the pores of a PM part. (c) soaking oil by capillary action into the pores of a PM part.
Which of the following most closely typifies the sintering temperature in Powder Metallurgy (PM): (T sub m - melting temp of the meta)
0.8 Tm
The average flow stress is the flow stress multiplied by which of the following factors? (n is the strain hardening exponent)
1 / ( 1 + n )
Which of the following are alternative names for indirect extrusion? ( 2 answers )
1. Backward extrusion 2. Reverse extrusion
Which of the following rolling mill types are associated with relatively small diameter rolls in contacts with the work?
1. Cluster Mill 2. Four-high Mill
Which of the following bulk deformation processes are involved in the production of nails ( both nail head and nail body ) for lumber construction. ( 3 best answers )
1. Impressions die forging 2. Flashless Forging 3. Bar wire drawing
Turbulence during pouring of the molten metal is undesirable for which of the following reasons (two best answers):
1. It increases erosion of the mold surfaces. 2. It increases the formation of metallic oxides that can become entrapped during solidification.
The three components of a Numerical Control (NC) System are?
1. Part program 2. The machine control unit 3. Processing equipment
Which of the following are bulk deformation processes?
1. Rolling 2. Forging 3. Extruding
Which of the following design features would be difficult or impossible to achieve by conventional pressing and sintering?
1. Threaded holes 2. Outside rounded corners 3. Side holes
Which of the following are classified as forging operations? ( 4 answers)
1. Upsetting 2. Swaging 3. Coining 4. Fullering
Which of the following casting processes are permanent mold operations (three correct answers)?
1. centrifugal casting 2. die casting 3. slush casting
Which of the following are advantages and characteristics of hot working relative to cold working? ( 4 answers )
1. fracture of work part is less likely 2. isotropic mechanical properties 3. lower deformation process required 4. more shape changes are possible
Identify which of the following applications are point-to-point and not continuous path operations.
1. hole punching material 2. drilling, spot welding
Which of the following are the usual objectives of heat treatment (three best answers)?
1. increase hardness 2. reduce brittleness 3. relieve stresses
Which of the following casting processes are expendable mold operations (three correct answers):
1. shell molding 2. sand casting 3. investment casting
A riser in casting is described by which of the following (three correct answers):
1. source of molten metal to feed the casting and compensate for shrinkage during solidification. 2. metal that is not part of the casting 3. waste metal that is usually recycled
Which of the following metals would typically be used in die casting (three best answers):
1. tin 2. aluminum 3. zinc
The standard coordinate system for numerical control machine tools is based on.
Cartesia Coordinate system
Most sheet metal working operations are performed as which one of the following?
Cold working
The upper half of a sand-casting mold is called ?
Cope
Which one of the following conventional machining processes is closest to grinding?
Milling
Which one of the following stamping dies is the most complicated?
Progressive die
The cutting force in a sheet- metal blanking operation depends on which mechanical property of the metal.
Shear strength
Which one of the following abrasive processes achieves the best surface finish.
Super finishing
Which one of the following is the best definition of bend allowance?
The length before bending of the straight sheet-metal section to be bent.
Total solidification time is defined as which one of the following:
Time between pouring and complete solidification.
( True or False ) In a sheetmetal cutting operation used to produce a flat part with a hole in the center, the scrap piece that was cut out to make the hole is called a slug
True, the cut out is a slug and the scrap piece is a blank
A disk‑shaped part is to be cast out of aluminum. The diameter of the disk = 418 mm and its thickness = 27 mm. If the mold constant = 2.2 sec/mm2 in Chvorinov's rule, how long will it take the casting to solidify (in the unit of seconds)?
Tts= Cm ( V/ A )^n V= piD^2 h/4 Surface A = piDh+(2piD^2/4) Answer: 314.5 sec
In precipitation hardening, the hardening and strengthening of the metal occurs in which one of the following steps?
aging
Which of the following abrasive material is most appropriate for grinding steel and cast iron?
aluminum oxide
Which one of the following surface-hardening treatments is the most common?
carburizing
Which of the following will improve surface finish in grinding?
denser wheel structure, higher wheel speed, lower work speed.
Investment casting is also known by which one of the following names?
lost‑wax process
A misrun is which one of the following defects in casting:
metal solidifies before filling the cavity
Which one of the following casting processes is the most widely used?
sand casting
On which one of the following metals is the treatment called austenitizing be performed?
steel
The treatment in which the brittleness of martensite is reduced is called which one of the following?
tempering
