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Mechanical Engineering Objective Questions { Material Science }



29. Sulphur in pig iron tends to make it
A.Hard
B.Soft
C.Ductile
D.Tough

30. Pick up wrong statement about wrought iron
A.It contains carbon of the order of 0 to 0.25%
B.It is made by adding suitable percentage of carbon to molten iron and subjecting the product to repeated hammering and rolling
C.It is very soft and ductile
D.It can be easily forge welded

31. Iron is
A.Paramagnetic
B.Ferromagnetic
C.Ferroelectric
D.Dielectric

32. A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as
A.Allotropic change
B.Recrystallisation
C.Heat treatment
D.Precipitation

33. Chilled cast iron has
A.No graphite
B.A very high percentage of graphite
C.A low percentage of graphite
D.Graphite as its basic constituent of composition

34. Cast iron has
A.High tensile strength
B.Its elastic limit close to the ultimate breaking strength
C.High ductility
D.All of the above

35. White cast iron contains carbon in the form of
A.Free carbon
B.Graphite
C.Cementite
D.White carbon

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