Mechanical Engineering - Engineering Materials

21. 

The malleability is the property of a material by virtue of which a material

A. regains its shape and size after the removal of external forces
B. retains the deformation produced under load permanently
C. can be drawn into wires with the application of a tensile force
D. can be rolled or hammered into thin sheets

Answer: Option D

Explanation:

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22. 

Which of the following statement is wrong?

A. The spheroidising process is usually applied to high carbon tool steels which are difficult to machine
B. In spheroidising process, the cementite in the granular form is produced in the structure of steel
C. The annealing process causes complete recrystallisation in steels which have been severely cold worked and a new grain structure is formed
D. none of the above

Answer: Option D

Explanation:

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23. 

Duplex process of steel making is a combination of

A. basic bessemer and acid open hearth processes
B. acid bessemer and basic open hearth processes
C. acid bessemer and acid open hearth processes
D. basic bessemer and basic open hearth processes

Answer: Option B

Explanation:

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24. 

In corrosion resistant properties, bronzes are __________ to brasses.

A. superior
B. inferior

Answer: Option A

Explanation:

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25. 

Steel containing 0.8 to 1.5% carbon, is known as

A. mild steel
B. dead mild steel
C. medium carbon steel
D. high carbon steel

Answer: Option D

Explanation:

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