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31.

In steel carbon is

A.	present wholly in the combined form	B.	mostly present in the free state as graphite
C.	not desirable	D.	none of the above

32.

Plastic deformation is

A.	the temporary distortion of a material under the action of applied stress	B.	the permanent distortion of a material under the action of applied stress
C.	related to plastics	D.	none of the above

33.

Erosion is the deterioration of metals by

A.	the corrosive action of fluids only	B.	the abrasive action of fluids only
C.	both corrosive action and abrasive action of fluids	D.	none of the above

34.

The total carbon content in pig iron may be

A.	0.08 to 0.02 %	B.	0.1 to 1.5 %
C.	3.0 to 3.5 %	D.	16 to 24 %

35.

Which of the following has maximum tensile strength?

A.	White cast iron	B.	Grey cast iron
C.	Pig iron	D.	Nodular cast iron

36.

Grey cast iron is produced

A.	when molten pig iron is allowed to cool gradually	B.	when molten pig iron is chilled suddenly
C.	when white cast iron is subjected to slow prolonged heating	D.	from nodular cast iron

37.

White cast iron is produced

A.	when molten pig iron is allowed to cool gradually	B.	when molten pig iron is chilled suddenly
C.	when grey cast iron is subjected to slow prolonged heating	D.	none of the above

38.

Corrosion resisting properties of cast iron are very much improved by the addition of 12-15 per cent of

A.	vanadium	B.	tungsten
C.	silicon	D.	phosphorus

39.

Corrosion resisting chromium - nickel steels contain

A.	16-24% Cr 7-12% Ni 1.5-2.0 Mn	B.	35-36% Cr 1.5-2.0% Ni 8-14% Mn
C.	7-12% Cr 1.5-2.0% Ni 16-24 Mn	D.	1.5-2.0% Cr 7-12% Ni 16-24% Mn

40.

Corrosion resisting materials are the alloys containing chromium as a base alloyed with

A.	iron vanadium tungsten	B.	iron molybdenum tungsten
C.	iron nickel cobalt	D.	iron vandadium molybdenum