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Austenitic stainless steel is characterized by

A.	a body-centred cubic crystal structure	B.	a face-centred cubic crystal structure
C.	a simple hexagonal crystal structure	D.	none of the above

Ferritic stainless steel is characterized by

A.	a simple hexagonal crystal structure	B.	a body-centred cubic crystal structure
C.	a face-centred cubic crystal structure	D.	none of the above

Alpha iron is stable

A.	upto 910?C	B.	between 910 and 1403?C
C.	above 1403?C	D.	above 2000?C

An increase in the carbon content of a steel

A.	increases its strength	B.	decreases its strength
C.	increases its ductility	D.	none of the above

An increase in the carbide/graphite ratio in cast iron tends to

A.	increase the hardness	B.	increase the brittleness
C.	decrease the ductility	D.	all of the above

Cementite

A.	is a compound of iron and carbon	B.	is characterized by an orthorhombic crystal structure
C.	has the approximate chemical formula Fe3C	D.	all of these answers

In martensitic stainless steel the difference between the chromium percentage and seventeen times the carbon content is

A.	less than 12.5%	B.	greater than 12.5 %
C.	greater than 24%	D.	less than 18%

In ferritic stainless steel the difference between the chromium percentage and seventeen times the carbon content is

A.	less than 24%	B.	greater than 24 %
C.	greater than 12.5%	D.	less than 12.5%

The carbon content is steel varies from

A.	0.1 to 1.50%	B.	0.35 to 2.5%
C.	2 to 4%	D.	5 to 8%

10.

The percentage of carbon is the least in

A.	white cast iron	B.	grey cast iron
C.	wrought iron	D.	stainless steel