Why the quality of sand deteriorates if the same molding sand is used again and again?
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Metallurgical Engineering · all questionsFoundry Metallurgy
Foundry Metallurgy
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Shrinkage allowances is also known as
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Green sand consists of
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The low permeability in sand can cause which of the following defects in casting
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In a sand casting of a rectangular slab, the thickness of the solidified layer after 2 minutes is known to be 3 cm. Based on Chvorinov's rule, the solidified thickness (in cm) after 4 minutes is
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Feed heads, feeders and risers in casting serve to provide sources of molten metal to compensate for
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What are the applications of nodular cast iron?
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In centrifugal castings, the impurities are . . . . . . . .
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The thickness of shells in shell molding is
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Solidification time of a thin plate casting in a sand mould increases by approximately 4 times with the doubling of
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Match the requirement from Group 1 with the suitable casting process from Group 2.
| Group 1 | Group 2 |
| P. Good surface finish | 1. Slush casting |
| Q. Expandable mould | 2. Pressure die casting |
| R. Heavy casting | 3. Investment casting |
| S. Hollow ornamental casting | 4. Sand casting |
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. . . . . . . . process removes fines and foreign matter, partly clay coating from the sand and partially removes the carbonaceous and organic materials from sand grains.
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Sprue in casting refers to . . . . . . . .
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The shrinkage allowance for 6mm section malleable cast iron is . . . . . . . . mm.
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If two parts of a mould are not joined properly, the casting may have the following defect.
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The solidification time for a cube casting having 5 cms side is 10 minutes. Under similar condition of heat transfer, the solidification time, inminutes, for a cube casting having 10 cm side will be
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In a casting, shrinkage occurs
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A jet engine turbine blade is normally manufactured by
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The casting processes that require expendable moulds are
P. Investment casting
Q. Low pressure casting
R. Shell moulding
S. Slush casting
P. Investment casting
Q. Low pressure casting
R. Shell moulding
S. Slush casting
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Riser in a casting compensates for
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