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Metal-casting Questions Set 18:

Quiz Mode

What is the typical casting yield of a non-pressurized gating system?

very high

80%

50%

very low

Solution:

Which of the following materials requires a longer pouring time?

Grey cast iron

Brass

Ferrous alloys

Nonferrous material

Solution:

The cross-section of all the elements of a gating system should normally be

circular

rectangular

oval

any of the above

Solution:

A casting defect formed when two metal streams meet without complete fusion is known as

misrun

cold shut

shift

hot cracks

Solution:

In which of the following techniques is the pattern covered tightly with a thin sheet of plastic?

Rotational molding

Impact molding

Blow molding

Vacuum molding

Solution:

The stream velocities are reduced, thus the turbulence and aspiration are minimized in a:

pressurized gating system

non-pressurized gating system

both 1 and 2

none of the above

Solution:

What is parting sand?

Silica sand mixed with oil

Silica sand and clay without the addition of any used sand

Old repeatedly used molding sand

Fine-grained, clay-free dried silica sand

Solution:

Which of the following is not a type of blow molding process?

Extrusion type blow molding

Injection type blow molding

Injection Stretch type blow molding

Multi-Medium type blow molding

Solution:

In solidification of metal during casting, compensation for solid contraction is

Provided by oversize pattern

Achieved by properly placed risers

Obtained by promoting directional solidification

Provided using chills

Solution:

How does the gas from molten plastic cause burning in the plastic during the injection molding process?

The gas mixed with air explodes.

Gas catches fire.

The trapped gas ignites from the heat generated by pressure.

None of the above.

Metal-casting Questions Set 18:

What is the typical casting yield of a non-pressurized gating system?

Solution:

Which of the following materials requires a longer pouring time?

Solution:

The cross-section of all the elements of a gating system should normally be

Solution:

A casting defect formed when two metal streams meet without complete fusion is known as

Solution:

In which of the following techniques is the pattern covered tightly with a thin sheet of plastic?

Solution:

The stream velocities are reduced, thus the turbulence and aspiration are minimized in a:

Solution:

What is parting sand?

Solution:

Which of the following is not a type of blow molding process?

Solution:

In solidification of metal during casting, compensation for solid contraction is

Solution:

How does the gas from molten plastic cause burning in the plastic during the injection molding process?

Solution:

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