Manf 251 Test 1 Quizzes (3,5,6,7,8,9)

Which of the following is not a step in the processing of new ceramics? a) preparation of raw materials b) shaping c) drying d) sintering e) finishing

c) drying

Steels contain which element as a primary alloy in concentrations of .02% to 2.11%

Carbon

The principal alloying element (besides carbon) in stainless steel is:

Chromium

The treatment that accomplishes cross-linking of elastomer molecules that makes rubber stronger and stiffer is called

Vulcanization

The tunnel like furnace used to anneal glass is called

a lehr

The principal process parameters for curing composite materials include a.) time b.) temperature c.) pressure d.) a and b e.) a and c f.) a, b, and c

a, b, and c

All of the following are valid statements for sand casting except: can not produce large parts good for producing small parts considered an expendable mold process can be adapted for mass production can create both external and internal shapes

can not produce large parts

All of the following are considered to be composite material except for: cement, plywood, clad metal, concrete, adobe

cement

All of the following are valid statements for permanent metal mold casting except: good for high production rates geometries limited by need to open (separate) mold commonly used for steel casting reasonable dimensional tolerance high mold cost

commonly used for steel casting

All of the following are considered terms commonly used with powder metallurgy, except: a) blending/mixing b) pressing c) green compound d) black compact e) sintering

d) black compound

The casting process in which molten metal is injected into the mold cavity under high pressure

die casting

All of the following are true except: a.) All the rubber industry is dominated by tires b.) The plastic and rubber industries are separate with little overlap c.) Natural Rubber is an agricultural crop d.) Synthetic rubber is based on petroleum e.) Rubber is seldom compounded with other additives

e.) Rubber is seldom compounded with other additives

Which of the following is the best process for producing plate glass

floating

Ceramics typically have all of the following properties except: brittle, high melting temperature, good electrical conductivity, high hardness, generally corrosion resistant

good electrical conductivity

The process in which a polymer is heated to a highly plastic state and forced to flow under high pressure into a mold cavity where it solidifies and is then removed from the cavity is called

injection molding

The following are all advantages of die casting with the exception of: economical for large production quantities good accuracy and surface finish can cast thin sections Limited to metals with high melting points Small grain size and strength due to rapid cooling methods

limited to metals with high melting points

Investment casting is also known as

lost wax casting

Aluminum is noted for all of the following properties except: light weight, high electrical conductivity, good corrosion resistance, good strength to weight ratio, low thermal conductivity

low thermal conductivity

Which of the following is not considered a basic category for shaping rubber products: calendaring extrusion coating machining molding/casting

machining

The term anisotropic means:

mechanically properties are directionally dependent

Of the polymeric materials discussed in class, which material can be subjected to heating and cooling cycles repeatedly without significant degradation

thermoplastics

Which of the following FRP shaping processes in NOT considered to be an open mold process: hand lay-up spray-up automated tape laying transfer molding automated fiber replacement

transfer molding

The amount by which a mold is made is made larger relative to the final casting size is called

pattern shrinkage allowance

A reservoir of liquid metal that is built into the mold to compensate for shrinkage of the part during solidification is called:

riser

Limitations and disadvantages of castings include all but the following: environmental problems, porosity, simple part geometries only, poor dimensional tolerance, safety hazards

simple part geometries only

Three sources of contraction in a metal casting after pouring include all but which of the following: contraction due to vapor escape contraction of the molten metal after pouring solidification shrinkage during the transformation of state thermal contraction in the solid state

Contraction due to vapor escape

The two basic categories of casting processes are

Expendable and Permanent mold casting

The process in which material is forced through a die orifice to produce long continuous product whose cross-sectional shape is determined by the shape of the orifice is known as: Extrusion Melt Spinning Compression Molding Thermoforming Blow Molding

Extrusion

The term when oil or other fluid is permeated into pores of a sintered PM part in called

Impregnation

The typical process sequence for glassworking includes all of the following steps except for: preperation of raw materials Shaping Machining Melting Heat Treatment

Machining