Mechanical Engineering - Engineering Materials

11. 

Which of the following statement is true about brittle fracture?

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

Answer: Option B

Explanation:

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12. 

Grey cast iron has

A. carbon in the form of free graphite
B. high tensile strength
C. low compressive strength
D. all of these

Answer: Option A

Explanation:

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13. 

Induction hardening is basically a

A. carburising process
B. surface hardening process
C. core-hardening process
D. none of these

Answer: Option B

Explanation:

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14. 

When elements like nickel, chromium, copper and molybdenum are added to the molten cast iron, it produces

A. white cast iron
B. nodular cast iron
C. malleable cast iron
D. alloy cast iron

Answer: Option D

Explanation:

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15. 

The strength is the ability of a material to resist

A. deformation under stress
B. externally applied forces with breakdown or yielding
C. fracture due to high impact loads
D. none of these

Answer: Option B

Explanation:

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