Engineering Materials problems
- 1. The hardness of steel depends upon the
Options- A. amount of cementite it contains
- B. amount of carbon it contains
- C. contents of alloying elements
- D. method of manufacture of steel Discuss
Correct Answer: amount of carbon it contains
- 2. When a low carbon steel is heated upto upper critical temperature
Options- A. there is no change in grain size
- B. the average grain size is a minimum
- C. the grain size increases very rapidly
- D. the grain size first increases and then decreases very rapidly Discuss
Correct Answer: the average grain size is a minimum
- 3. Which of the following statement is correct?
Options- A. The product produced by blastfurnace is called cast iron.
- B. The pig iron is the name given to the product produced by cupola.
- C. The cast iron has high tensile strength.
- D. The chilled cast iron has no graphite. Discuss
Correct Answer: The chilled cast iron has no graphite.
- 4. Which of the following statements are true for annealing of steels?
Options- A. Steels are heated to 500 to 700° C
- B. Cooling is done slowly and steadily
- C. Internal stresses are relieved
- D. all of these Discuss
Correct Answer: all of these
- 5. Which of the following statement is true about brittle fracture?
Options- A. High temperature and low strain rates favour brittle fracture
- B. Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture
- C. Brittle fracture is always preceded by noise
- D. Cup and cone formation is characteristic for brittle materials Discuss
Correct Answer: Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture
- 6. Beryllium bronze has
Options- A. high yield point
- B. high fatigue limit
- C. both (a) and (b)
- D. none of these Discuss
Correct Answer: both (a) and (b)
- 7. Martensite has needle like structure and is magnetic.
Options- A. Correct
- B. Incorrect Discuss
Correct Answer: Correct
- 8. Which of the following material has nearly zero coefficient of expansion?
Options- A. Stainless steel
- B. High speed steel
- C. Invar
- D. Heat resisting steel Discuss
Correct Answer: Invar
- 9. The iron ore in the charge of blast furnace acts as an iron bearing mineral.
Options- A. True
- B. False Discuss
Correct Answer: True
- 10. Which of the following display properties similar to that of steel?
Options- A. Blackheart cast iron
- B. Whiteheart cast iron
- C. both (a) and (b)
- D. none of these Discuss
Correct Answer: both (a) and (b)
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