MENG 1300 - [7,8,13,26] QUIZ

Synthetic diamonds date to:

1950's

A thermoforming mold with a convex form is called which one of the following:

A positive mold

In precipitation hardening, the hardening and strengthening of the metal occurs in which one of the following steps:

Aging

Which one of the following comes closest to expressing the chemical composition of clay:

Al2(Si2O5)(OH)4

Which of the following ceramics are commonly used as abrasives in grinding wheels:

Aluminum oxide

Which of the following is not a selective surface hardening method?

Austenitizing

Which of the following processes are generally limited to thermoplastic polymers:

Blow molding

Which of the following processes is associated with the production of plastic sheet and film:

Blown-film extrusion process

Of the following quenching media, which one produces the most rapid cooling rate:

Brine

Which one of the following is the chemical formula for the repeating unit in polyethylene:

C2H4

Which one of the following surface hardening treatments is the most common?

Carburizing

The two principal components of an injection molding machine are which of the following:

Clamping and injection units

Which of the following is a section of a conventional extruder barrel for thermoplastics:

Compression section

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

False - It is the force of gravity in the doubly rotating mold that forces the polymer against the mold surfaces.

Which of the following defects or problems is associated with injection molding:

Flash

Which of the following is NOT one of the usual objectives of heat treatment?

Increase recrystallization temperature

The function of the ejection system in injection molding is which one of the following:

Separate the part from the cavity after molding

On which one of the following metals is the treatment called austenitizing performed:

Steel

The leading commercial synthetic rubber is which one of the following:

Styrene-butadiene rubber

The treatment in which the brittleness of martensite is reduced is called which one of the following:

Tempering

Of the three polymer types, which one is the most important commercially:

Thermoplastics

Which one of the three polymer types does not involve cross- linking:

Thermoplastics

The parting line in injection molding is which one of the following:

Where the two mold halves come together

Which one of the following materials is closest to diamond in hardness:

cubic boron nitride

The Jominy end-quench test is designed to indicate which one of the following:

hardenability

In which of the following property categories do plastic parts often compare favorably with metals:

impact resistance

Among the thermosetting polymers, the most widely used commercially is which one of the following:

phenolics

Glass products are based primarily on which one of the following minerals:

silica