10. Over 50% of all metallic zinc iswed inthe 1D A material is coated with a lay

Question

10. Over 50% of all metallic zinc iswed inthe 1D A material is coated with a layer of zinc by one of a variety of processes that inclade ie of molten metal (hot dipping) and electrolytie plating a. Simonizing of inon and seet In this process he inon-based n a bath b. Spheroidizing Metallic glasses or By cooling liquid metal e Casting d. Galvanizing 11. intere-have existed in the form of thin ribbons and fine powders since the 1960s. at an extremely fast rate, a rigid solid is produced that lacks crystalline structure. b. Metallic liquids 12. Which of the following is NOT a characteristic of aluminum . Aqueous metals d. Enormous metals Corrosion resistant High thermal, electrical conductivity a. b. c. Lightweight d. High density 13. A common way to produce aluminum components is by where the part is squeezed through a die of the desired profile. a. Delusion b. Infusion c. Pultrusion d. Extrusion Solidification time can be predicted by usingke Yoke 14. Chvorinov's Rule Central Limit Theorem a. c. Poke d. Young's Modulus b. 15· The or smallest cross-sectional area in the gating system, serves to control the rate of metal flow a. Sprue b. Nor gate c. Choke d. Solidus are added reservoirs designed to fill with liquid metal, which is then fed to the casting as a means of To effectively perform this function, they must solidify after the 16. compensating for solidification shrinkage. casting. a. Risers b. Sprue c. Gate d. Pouring basin 17. The mechanical properties of a casting are improved by a. b. Sealing with resin Isostatic pressing c. Forging d. Sintering 18. The least expensive method of expendable mold/reusable pattern casting is: c. Plaster mold d. Foam mold a. Ceramic mold b. Sand mold Copper alloys A variety of ferrous and nonferrous alloys 19. Evaporative foam casting is used to cast: c. Aluminum Only Aluminum and magnesium d. a. b.

Explanation / Answer

10 D

11 A metallic glasses are a part of amorphous metal

12 D aluminium have low density compared to others

13 D extrusion is the process which uses a die to produce components

14 A

15 C

16 A

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