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Engineering Materials - Interview Questions and Answers

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181. Grey cast iron
A. contains 1.7 to 3.5% carbon in fre< state and is obtained by the slov cooling of molten cast iron
B. is also known as chilled cast iron am is obtained by cooling rapidly. It i: almost unmachinable
C. is produced by annealing process. I is soft, tough and easily machinec metal
D. is produced by small additions o magnesium (or cerium) in the ladle Graphite is in nodular or spheroida form and is well dispersed throughou the material
E. none of the above is true.
Explanation:
182. The hardness of steel increases if it contains
A. austenite
B. martensite
C. pearlite
D. cementite
E. all of the above.
Explanation:
183. Which of the following element results in presence of free graphite in C.I.
A. carbon
B. sulphur
C. silicon
D. manganese
E. phosphorous.
Explanation:
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