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43.

A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as                        
A. allotropic change B. recrystallization
C. heat treatment D. austempering.



44.

Chilled cast iron has                        
A. no graphite B. a very high percentage of graphite
C. a low percentage of graphite D. none of the above is true.



45.

Cast iron has                        
A. high tensile strength B. its elastic limit close to the ultimate breaking strength
C. high ductility D. none of the above.




46.

White cast iron contains carbon in the form of                        
A. free carbon B. graphite
C. cementite D. ferrite.



47.

In mottled cast iron, carbon is available in                        
A. free form B. combined form
C. nodular form D. partly in free and partly in combined state.



48.

An important property of high silicon (12 - 18%) cast iron is the high                        
A. tenacity B. brittleness
C. plasticity D. hardness.



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