You must answer all the questions (except calculation problems) on the answer sh

Question

You must answer all the questions (except calculation problems) on the answer sheet using No.2 pencil. . Please return both exam paper and answer sheet when you finish the exam. Questions 1-10: True or False (2 points/each) If it is a True statement, please mark A on your answer sheet If it is a False statement, please mark B on your answer sheet. I. All AX type ceramics have the same coordination number. 2. High carbon steels have higher ductility, compared with low carbon steels 3. Frenkel defect in ceramics is a pair of one cation and one anion vacancies. 4. White iron has higher carbon content compared with high carbon steel. 5. In powder metallurgy, there is no need to melt metal powder. 6. In vitrification process, the dried "green"component will be completely melted. 7. Eutectoid transition produces pearlite structures in steels 8. The hardening of cement is due to hydration. 9. The impurities in ceramic materials must satisfy electroneutrality 10. Cast irons have lower melting temperature compared with steels Questions 12-35: Multiple Choice (2 points/each) Following Four images represent three types of microstructures found in steels, please answer questions 11-15 11. Which structure is banite? 12, which structure has the highest strength and modulus, but lowest ductility? 13. Which structure could be created by heating up structure martensite? 14. Compare structure A and structure C, which is formed at lower temperature? 15. Which microstructure is created by the very fast cooling? 16. Which thermal treatment is able to create large internal stress in glass? A. Tempering: B. Annealing: C.Quenching

Explanation / Answer

1.- B

2.- B

3.- A

4.- B

5.- B

6.- B

7.- A

8.- A

9.- A

10.- A

11.- C

12.- D

13.- D

14.- C

15. - D

16. quenching

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