AT&T; LTE 9:40 AM 100% (iii), + Done Prodfirstexam.docx 1. The mining industries

Question

AT&T; LTE 9:40 AM 100% (iii), + Done Prodfirstexam.docx 1. The mining industries are considered part of industry classifications. 2. Four categories of engineering materials that are used in the manufacturing processes are: Metals with alloys, plastics, 3. Thermoplastics polymers might be processed through various heating and cooling cycles TrueFalse 4. To alloy with copper to form brass, zinc is used as alloying material. True False 5. Titanium has high strength-weight ratio as compared to most of other metals. True False 6. Glass has crystalline structure. True False 7. A three point rupture test might be used for determining the strength of elastic materials True False 8. Eutectic alloys have usually a single melting temperature. 9. Unilateral tolerance allows only positive variation. 10. Sand casting operations are associated with worse surface True False True False finish as compared to other manufacturing operations. 11. Poor surface finish usually leads to lower friction. 12. Ceramics have good thermal conductivity as compared to TrueFalse TrueFalse metals, TrueFalse 13. Roughness and waviness are usually defined in term of resolution of spacing of actual surface from ideal surface )True False 14. Which one is not a finishing operation (a)Honing b)Lapping (c)Polishing d)Drilling 15. Pattern stays within the mold during casting process. TrueFalse 16. Using expendable molds in general decrease rate of TrueFalse 17. Parting line is a feature that belongs to closed mold casting. TrueFalse 18. Metal supports of various designs used to hold the core in place in the sand mold are called

Explanation / Answer

The answers are attached below.

1. Based on  International Standard Industrial Classification of all Economic Activities (ISIC), mining industries are considered as a part of Mining and Quarrying Industry.

2. Engineering materials classified into Metals with Alloys, Plastics, Composites, Ceramics.

3. True.

Thermoplastics can be reversibly melted by heating and solidified by cooling in a limited number of cycles without affecting the mechanical properties.

4. True.

Brass is a metallic alloy that is made of copper and zinc.

5. True.

Titanium is a very strong, durable and low-density element that is also lightweight. As strong as some steels but 45% lighter, titanium has the highest strength-to-weight ratio out of all the know metals.

6. True.

7. False

8. False

Eutectic alloys have a plastic melting point range.

9. True.

A unilateral tolerance exists when a target dimension is given along with a tolerance that allows variation to occur in only one direction. The bilateral tolerance allows both directions.

10. True.

11. False.

Poor surface finish leads to high friction.

12. True.

13.True.

14. D.

Drilling

15. True

Hope this helps!

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