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Mechanical Engineering Objective Questions { Material Science }



15. The ability of a material to resist softening at high temperature is known as
A.Creep
B.Hot tempering
C.Hot hardness
D.Fatigue

16. In compression, a prism of brittle material will break
A.By forming a bulge
B.By shearing along oblique plane
C.In direction perpendicular to application of load
D.By crushing into thousands of pieces

17. Malleability of a material can be defined as
A.Ability to undergo large permanent deformations in compression
B.Ability to recover its original form
C.Ability to undergo large permanent deformations in tension
D.All of the above

18. For the allotropic forms of iron, the points of arrest are
A.The points where no further change occurs
B.Constant for all metals
C.The points where there is no further flow of metal
D.The points of discontinuity

19. Ductility of a material can be defined as
A.Ability to undergo large permanent deformations in compression
B.Ability to recover its original form
C.Ability to undergo large permanent deformations in tension
D.All of the above

20. The percentage of carbon in pig iron varies from
A.0.1 to 1.2%
B.1.5 to 2.5%
C.2.5 to 4%
D.4 to 4.5%

21. The percentage of carbon in grey iron cast' ings usually varies between
A.0.5 to 1%
B.1 to 2%
C.2.5 to 4.5%
D.5 to 7%

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