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Metal-casting Questions Set 29:

Quiz Mode

What should the total percentage of re-use of sand in reclamation be?

80%

85%

90%

95%

Solution:

The proper hand tool to withdraw a pattern is:

lifter

vent wire

gate knife

draw spikes

Solution:

Why are castings primarily used?

Low weight

High strength

Good damping characteristics

Low cost

All of the above

Solution:

The heated metal pattern used in shell moulding is typically made of:

Aluminium

Medium carbon steel

Grey cast iron

Bronze

Solution:

On which of the following does the location of the riser least depend?

design of casting

metal to be cast

size of the core

type of gate used

Solution:

What is the purpose of tuyeres in a cupola furnace?

To allow passing of air into the furnace

For pouring of coal

To allow molten iron to come out of the furnace

For inserting iron metal in the furnace

Solution:

What are hot tears in casting?

the cracks due to residual stresses

the shrinkage cavities due to improper riser

the extra metals due to erosion of mold

the dots found after removing dirt from the surface

Solution:

In a green sand molding process, uniform ramming leads to

less chance of gas porosity

greater dimensional stability of the casting

less sand expansion type of casting defect

uniform flow of molten metal into the mold cavity

Solution:

During the filling process of a given sand mold cavity by molten metal through a horizontal runner of circular cross-section, the frictional head loss of the molten metal in the runner will increase with the

Increase in runner diameter

Decrease in length of runner

Increase in average velocity of molten metal

Decrease in internal surface roughness of the runner

Solution:

Which of the following is not a true statement about the Rapping Allowance given during the casting process?

This allowance is provided to avoid the damages taking place due to adhering of molding sand to the pattern walls.

When the pattern is made using materials like wax, mercury, or polystyrene, no rapping allowance is to be provided.

It is a positive allowance.

It is a negative allowance.

Metal-casting Questions Set 29:

What should the total percentage of re-use of sand in reclamation be?

Solution:

The proper hand tool to withdraw a pattern is:

Solution:

Why are castings primarily used?

Solution:

The heated metal pattern used in shell moulding is typically made of:

Solution:

On which of the following does the location of the riser least depend?

Solution:

What is the purpose of tuyeres in a cupola furnace?

Solution:

What are hot tears in casting?

Solution:

In a green sand molding process, uniform ramming leads to

Solution:

During the filling process of a given sand mold cavity by molten metal through a horizontal runner of circular cross-section, the frictional head loss of the molten metal in the runner will increase with the

Solution:

Which of the following is not a true statement about the Rapping Allowance given during the casting process?

Solution:

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