1.

Presence of which material in a gray cast iron causes reduced ductility?(a) Graphite(b) Aluminium(c) Coke(d) Zinc

Answer» The correct answer is (a) Graphite

Explanation: Among all the types of cast irons that are manufactured, gray cast irons are most widely used. The colour of this alloy is dull gray. Gray cast iron contains graphite flakes, which are responsible for the reduced ductility and strength.


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