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49.

An important property of malleable cast iron in comparison to grey cast iron is the high

A.	compressive strength	B.	ductility
C.	carbon content	D.	surface finish.

50.

Steel contains

A.	80% or more iron	B.	50% or more iron
C.	alloying elements like chromium, tungsten nickel and copper	D.	high quantities of sulfur.

51.

Carbon steel is

A.	made by adding carbon in steel	B.	refined from cast iron
C.	an alloy of iron and carbon with varying quantities of phosphorus and sulfur	D.	extremely brittle.

52.

Annealing of white cast iron results in production of

A.	malleable iron	B.	nodular iron
C.	spheroidal iron	D.	none of the above.

53.

Killed steels' are those steels

A.	which are destroyed by burning^	B.	which after their destruction are recycled to produce fresh steel
C.	which are deoxidised in the ladle with silicon and aluminium	D.	which have poor properties due to im¬proper manufacturing.

54.

Hardness of steel depends on

A.	amount of carbon it contains	B.	the shape and distribution of the car-bides in iron
C.	method of fabrication	D.	the quality of ore from which it is made.

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