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Metal-casting Questions Set 15:

Quiz Mode

Which additives are added to the mould sand to increase its permeability?

Saw dust

Wood flour

Molares

Dextrin

Solution:

What device is used to measure the volume of air passing through a cupola?

Volume meter

Pressure meter

Area meter

Surface meter

Solution:

Which of the following materials will require the largest size of riser for the same size of casting?

Aluminum

Cast iron

Steel

Copper

Solution:

To increase the life of permanent molds, the surfaces of the mold cavity are usually coated with which of the following?

Silver

Refractory slurry

Zinc

Aluminum

Solution:

Which of the following considerations is independent of the selection of molding material?

Pouring temperature

Size of the casting

Fluidity of pouring melt

Frequency of casting cycle

Solution:

During solidification of a pure molten metal, the grains in the casting near the mold wall are:

Coarse and randomly oriented

Fine and randomly oriented

Fine and ordered

Coarse and ordered

Solution:

According to Chvorinov's rule, the solidification time of a casting is

proportional to the square of volume

both 1 and 2

none of the above

proportional to the volume-to-surface area ratio

Solution:

What is the optimum pouring time for cast iron with a mass of 100 kg and a thickness of 25 mm, given that the fluidity of the iron is 32 inches?

18.55 seconds

24.98 seconds

28.7 seconds

55.23 seconds

Solution:

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

provided by the oversize pattern

achieved by properly placing risers

obtained by promoting directional solidification

made by providing chills

Solution:

The primary purpose of a sprue in a casting mold is to:

Feed the casting at a rate consistent with the rate of solidification

Act as a reservoir for molten metal

Feed molten metal from the pouring basin to the gate.

Help feed the casting until all solidification takes place.

Metal-casting Questions Set 15:

Which additives are added to the mould sand to increase its permeability?

Solution:

What device is used to measure the volume of air passing through a cupola?

Solution:

Which of the following materials will require the largest size of riser for the same size of casting?

Solution:

To increase the life of permanent molds, the surfaces of the mold cavity are usually coated with which of the following?

Solution:

Which of the following considerations is independent of the selection of molding material?

Solution:

During solidification of a pure molten metal, the grains in the casting near the mold wall are:

Solution:

According to Chvorinov's rule, the solidification time of a casting is

Solution:

What is the optimum pouring time for cast iron with a mass of 100 kg and a thickness of 25 mm, given that the fluidity of the iron is 32 inches?

Solution:

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

Solution:

The primary purpose of a sprue in a casting mold is to:

Solution:

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