ME 383 Test 1_Metal Casting
In foundry work, a runner is which one of the following? (a) channel in the mold leading from the downsprue to the main mold cavity, (b) foundryman who moves the molten metal to the mold, or (c) vertical channel into which molten metal is poured into the mold.
Answer. (a)
Sand casting is which of the following types? (a) expendable mold, or (b) permanent mold.
Answer. (a)
The upper half of a sand casting mold is called which of the following? (a) cope, or (b) drag.
Answer. (a)
Total solidification time is defined as which one of the following? (a) time between pouring and complete solidification, (b) time between pouring and cooling to room temperature, (c) time between solidification and cooling to room temperature, or (d) time to give up the heat of fusion.
Answer. (a)
In a sand casting mold, the V/A ratio of the riser should be which one of the following relative to the V/A ratio of the casting itself? (a) equal, (b) greater, or (c) smaller.
Answer. (b)
In casting, a flask is which one of the following? (a) beverage bottle for foundrymen, (b) box which holds the cope and drag, (c) container for holding liquid metal, or (d) metal which extrudes between the mold halves.
Answer. (b)
During solidification of an alloy when a mixture of solid and liquid metals are present, the solid-liquid mixture is referred to as whic h one of the following? (a) eutectic composition, (b) ingot segregation, (c) liquidus, (d) mushy zone, or (e) solidus.
Answer. (d)
Chvorinov's Rule states that total solidification time is proportional to which one of the following quantities? (a) (A/V)n, (b) Hf, (c) Tm, (d) V, (e) V/A, or (f) (V/A)2; where A = surface area of casting, Hf = heat of fusion, Tm = melting temperature, and V = volume of casting.
Answer. (f)