1. Sand casting is which of the following types:(a) expendable mold or (b) perma
ID: 2073734 • Letter: 1
Question
1. Sand casting is which of the following types:(a) expendable mold or (b) permanent mold? 2. The upper half of a sand casting mold is called which of the following: (a) cope or (b) drag? 3. In casting, a flask is which one of the following: (a) beverage bottle for foundrymen, (b) box which holds the cope drag. (c) container for holding liquid metal, or (d) metal which extrudes between the mold halves? 4. In foundry work, a runner is which one of the following: (a) channel in the mold leading from the downsprue to main mold cavity, (b) foundrym metal is poured into the mold? an who moves the molten metal to the mold, or (c) vertical channel into which molten 5. Turbulence during pouring of the molten metal is undesirable for which of the following reasons (two best answers) (a) it causes discoloration of the mold surfaces, (b) it dissolves the binder used to hold together the sand mold, (c) it increases erosion of the mold surfaces (d) it increases the formation of metallic oxides that can become entrapped during solidification, (e) it increases the mold filling time, and (f) it increases total solidification time? 6. A riser in casting is described by which of the following (three correct answers): (a) an insert in the casting that inhibits buoyancy of the core, (b) gating system in which the sprue feeds directly into the cavity (c) metal that is not part of the casting, (d) source of molten metal to feed the casting and compensate for shrinkage during solidification, and (e) waste metal that is usually recycled? 7. In a sand casting mold, the V/A ratio of the riser should be (a) equal to, (b) greater than, or (c) smaller than the V/A ratio of the casting itself? 8. Name the two basic categories of casting processes? 11.1 in sand casting, the volumetric size of the pattern is (a) bigger than, (b) the same size as, or (c) smaller than the cast part?Explanation / Answer
1.
Answer (a). Expendable mold
Explaination: Sand casting is one of the most popular and simplest casting technique which is type of expendable mold casting.
2.
Answer (a). Cope
Explaination: Upper half of sand casting mold is called cope and lower half is called as drag.
3.
Answer (b) Box which holds the cope and drag.
Explaination: Upper half of sand casting mold is called cope and lower half is called as drag. Part which holds cope and drag is called as flask.
4.
Answer (a) channel in the mold leading from the downsprue to the main mold cavity.
Explaination: Runner is the passage way in the parting plane through which molten metal flow is regulated from downsprue to main mold cavity.
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