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31.

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

32.

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

33.

Hardness of martensite is about

34.

Limestone is added in blast furnace to flux

35.

The purpose of annealing is to

A.	Induce hardness	B.	Induce stresses
C.	Harden the surface	D.	Produce irregular microstructure
E.	Remove stresses

36.

Case hardening

A.	Is done to induce hardness in the core of materials	B.	Is followed by tempering
C.	Is preceded by tempering	D.	Is allowed by carburizing
E.	Is done to get a soft ductile interior with a very hard surface

37.

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

38.

Nitriding is a process for

39.

Malleal lity of a material is defined as

A.	Ability to withstand compressive stresses	B.	Ability to withstand deformation under shear
C.	Ability to undergo large permanent deformation in compression	D.	The property by which a material can be cold worked
E.	None of the above

40.

The effect f rolling on steel is

A.	To elongate the inclusions in the direction of rolling giving the steel excellent properties	B.	Reduction in tensile strength
C.	Reduction in fatigue strength	D.	Reduction in hardness
E.	None of the above