Mechanical Engineering - Engineering Materials

6. 

Cast iron is a

A. ductile material
B. malleable material
C. brittle material
D. tough material

Answer: Option C

Explanation:

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7. 

The hardness is the property of a material due to which it

A. can be drawn into wires
B. breaks with little permanent distortion
C. can cut another metal
D. can be rolled or hammered into thin sheets

Answer: Option C

Explanation:

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8. 

Malleable cast iron is produced

A. by adding magnesium to molten cast iron
B. by quick cooling of molten cast iron
C. from white cast iron by annealing process
D. none of these

Answer: Option C

Explanation:

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9. 

Smelting is the process of

A. removing the impurities like clay, sand etc. from the iron ore by washing with water
B. expelling moisture, carbon dioxide, sulphur and arsenic from the iron ore by heating in shallow kilns
C. reducing the ore with carbon in the presence of a flux
D. all of the above

Answer: Option C

Explanation:

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10. 

The percentage of carbon in cast iron varies from

A. 0.1 to 0.5
B. 0.5 to 1
C. 1 to 1.7
D. 1.7 to 4.5

Answer: Option D

Explanation:

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