Mechanical Engineering - Engineering Materials

11. 

Which of the following iron exists at 910° C?

A. α-iron
B. β-iron
C. γ-iron
D. δ-iron

Answer: Option A

Explanation:

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12. 

The iron ore mostly used for the production of pig iron is

A. magnetite
B. haematite
C. limonite
D. siderite

Answer: Option B

Explanation:

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13. 

A carbon steel having Brinell hardness number 100 should have ultimate tensile strength closer to

A. 100 N/mm2
B. 200 N/mm2
C. 350 N/mm2
D. 1000 N/mm2

Answer: Option C

Explanation:

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14. 

The steel widely used for making precision measuring instruments is

A. nickel steel
B. nickel-chrome steel
C. high speed steel
D. chrome-vanadium steel

Answer: Option A

Explanation:

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15. 

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

A. can be drawn into wires
B. breaks with little permanent distortion
C. can be rolled or hammered into thin sheets
D. can resist fracture due to high impact loads

Answer: Option A

Explanation:

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