Mechanical Engineering - Engineering Materials

21. 

The property of a material essential for spring materials is

A. stiffness
B. ductility
C. resilience
D. plasticity

Answer: Option C

Explanation:

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22. 

A steel with carbon above 0.8% is known as hyper-eutectoid steel.

A. Agree
B. Disagree

Answer: Option A

Explanation:

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23. 

Which of the following material has nearly zero coefficient of expansion?

A. Stainless steel
B. High speed steel
C. Invar
D. Heat resisting steel

Answer: Option C

Explanation:

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24. 

In normalising process, the hypo-eutectiod steel is heated from 30° C to 50° C above the upper critical temperature and then cooled in still air.

A. True
B. False

Answer: Option A

Explanation:

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25. 

The alloying element which can replace tungsten in high speed steels is

A. nickel
B. vanadium
C. cobalt
D. molybdenum

Answer: Option D

Explanation:

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