manufacturing: Plastics and PM

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In plastics injection molding, which of the following statements is the correct definition of a sink?

A depression on the surface of the molded part causes by shrinkage upon solidification

Which of the following process would be applicable to produce hulls for small boats

Blow molding, rotational molding, vacuum termoforming

filament winding involves the use of which one of the following fiber reinforcements?

Continuous filaments

A hot-runner three-plate mold offers which of the following advantages when compared to a cold-runner, two plate mold

Gating is usually a the base of the part to reduce part lines, Automatic separation of parts from runners

Which of the following is the most common polymer type in fiber-reinforced polymer composites

Thermosets

In ceramic, properties improvement comes from

strong bonds between complex oxide particles, loss of moisture,

The termal tempering of glass is

takes relatively short time, hot glass is cooled quickly, it is better with lower thermal conductivity, it is better with higher coefficient of thermal expansion

Which of the following processes are generally limited to thermoplastic polymers

thermoforming and blow molding

Injection molding is not suitable for processes thermosets becasue of their short solidifaction time

true

Use of a parison is associated with which plastic shaping processes?

blow molding

The term encapsulation refers to which of the following plastics shaping processes?

casting

A molding operation that uses sheet-molding compound is a form of which of the following

compression molding

Which of the following forming processes does not apply to thermoset polymers

extrusion

True/false: In rotational molding, centrifugal force is used to force the polymer melt against the surfaces of the mold cavity where solidification occurs

false

True/false: Thermosets are injection molded in cool molds

false

Density within the compacted powder metal parts vary due to

friction between particles and the particles and the mold

which of the following is not a property of polymers

high strength to weight ratios compared to metals

isostatic pressing resolves which of the following problems

homogenous density distribution

Injection molding is similar to which of the following metal forming processes

hot chamber die casting

Green mold

moisture is contained in the mold

A female mold with a smooth surface will produce a good finish on which surfaces of the laminated product in the hand lay-up method

outside surface

In hot isostatic pressing, the mold is most typically made of which of the following

sheet metal


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