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Metal-casting Questions Set 22:

Quiz Mode

What is the typical surface finish of castings produced using the plaster-molding process?

Slippery

Rough

Good

Bad

Solution:

In die casting, the molten metal is forced into a mold under high pressure.

True

No such situation exists

False

Cannot say

Solution:

For proper functioning of the riser, the freezing ratio must be

equal to zero

less than unity

greater than unity

none of the above

Solution:

Which of the following is a negative allowance in manufacturing?

Machining allowance

Draft allowance

Shrinkage allowance

Shake allowance

Solution:

Thin-walled hollow castings can be made by a permanent mold casting process called

Slush casting

Lost-foam casting

Shell molding

Vacuum molding

Solution:

Venting is done on a mold using vent wire to:

none of the above

reduce the weight of the mold

increase the mold property

provide a path for metal overflow

Solution:

What is the purpose of using chills in molds?

Reduce the freezing time

Achieve directional solidification

Reduce the possibility of blow holes

Smoothen the metal for reducing spatter

Solution:

Which of the following types of molds are typically made of sand, plaster, ceramics, and similar materials and generally are mixed with various binders?

Permanent molds

Expendable molds

Composite molds

Ceramic molds

Solution:

In a gating system, the ratio 1:2:4 represents

Sprue base area: runner area: ingate area

Pouring basin area : ingate area : runner area

Sprue base area : ingate area : casting area

Runner area : ingate area : casting area

Solution:

Shrinkage allowance on a pattern is provided to compensate for shrinkage when:

The temperature of the liquid metal drops from the pouring to the freezing temperature

The metal changes from the liquid to the solid state at the freezing temperature

The temperature of the solid phase drops from the freezing to the room temperature

The temperature of the metal drops from the pouring to the room temperature

Metal-casting Questions Set 22:

What is the typical surface finish of castings produced using the plaster-molding process?

Solution:

In die casting, the molten metal is forced into a mold under high pressure.

Solution:

For proper functioning of the riser, the freezing ratio must be

Solution:

Which of the following is a negative allowance in manufacturing?

Solution:

Thin-walled hollow castings can be made by a permanent mold casting process called

Solution:

Venting is done on a mold using vent wire to:

Solution:

What is the purpose of using chills in molds?

Solution:

Which of the following types of molds are typically made of sand, plaster, ceramics, and similar materials and generally are mixed with various binders?

Solution:

In a gating system, the ratio 1:2:4 represents

Solution:

Shrinkage allowance on a pattern is provided to compensate for shrinkage when:

Solution:

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