Engineering Materials mcq

Engineering Materials mcq

01.Within elastic limits

Deformation is proportional to the Load

02. A body which is permanently

deformed is said to have undergone

Uniform deformation

03. According to Hooke’s law

Within elastic limits average stress is

proportional to average strain.

04.Identify the correct statement

A metal which is brittle in tension may be ductile under hydro static compression.

05. A body which does not contain voids

or empty spaces is known as

Continuous body

06. The limiting load beyond which the material no longer behaves elastically is known is

Elastic limit

07. Identify the correct statement

A metal which is ductile in tension at

room temperature can become brittle

in the presence of notches

08. The defect responsible for the phenomenon of slip, by which most metals deform plastically, is known as

Dislocation

09. Fatigue failure occurs when a part is subjected to

Fluctuating stress

10. Stress concentration occurs when

A body is subjected to nonuniform stress  distribution

11. The ability of material to absorb energy when deformed elastically and to return it when unloaded is called

Resilience

12. The ability of a material to absorb energy in the plastic range is known as

Toughness

13. A surface damage which results when two surfaces in contact experience light periodic relative motion is

Fretting

14. The fatigue strength of materials Increases

By under stressing the specimen

15. Toughness of a material means

Strength

16. The process of reheating hardened steel to temperature below the lower critical temperature followed by any desired rate of cooling, is known as

Tempering

17. The process of production of articles having a soft ductile interior and a very hard surface, is known as

Case hardening

18. Hardness of martensite is about

RC 65     

             

19. The purpose of annealing is to

Remove stresses

20. Case hardening

Is done to get a soft ductile interior with a very hard surface

21. Any process of heating and cooling steel that produces a rounded or globular from of carbide is known as

Spheroidizing

22. Nitriding is a process for

Case hardening

23. Malleability of a material is defined

as Ability to undergo large permanent deformation in compression

24. In order to measure/detect materials by nondestructive testing the method generally used is

Acoustic emission

25. Spring steel sections are originally applied in

Annealed condition

26. The main alloy for corrosion resistance in stainless steel is

Chromium

27. Silicon steel is widely used in

Electrical industry

28. The process by which steel is coated by a thin layer of phosphate is known as

Parkerising

29. Cast iron contains

2 to 4 % carbon

30. Tensile strength of common varieties of cast iron is in the range

140 to 500 MPa.

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