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Engineering Materials - Interview Questions and Answers

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106. In mottled cast iron, carbon is available in
A. free form
B. combined form
C. nodular form
D. flat form
E. partly in free and partly in combined state.
Explanation:
107. A reversible change in the atomic structure of steel with corresponding change in the properties is known as
A. molecular change
B. physical change
C. allotropic change
D. solidus change
E. atomic change.
Explanation:
108. Chilled cast iron has
A. no graphite
B. a very high percentage of graphite
C. a low percentage of graphite
D. graphite as its basic constituent of composition
E. none of the above is true.
Explanation:
109. The percentage of carbon in grey iron castings usually varies between
A. 0.5 to 1%
B. 1 - 2%
C. 2.5 to 4.5%
D. 5 - 7%
E. 7-9%.
Explanation:
110. Pig iron is the name given to
A. raw material for blast furnace
B. product of blast furnace made by reduction of iron ore
C. iron containing huge quantities of carbon
D. iron in molten form in the ladles
E. iron scrap.
Explanation: