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Engineering Materials - Interview Questions and Answers

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126. In grey cast iron, carbon is present in the form of
A. cementite
B. free carbon
C. flakes
D. spheroids
E. nodular aggregates of graphite.
Explanation:
127. Pick up wrong statement about wrought iron
A. It contains carbon of the order of 0 to 0.25%
B. It melts at 1535�C
C. It is very soft and ductile
D. It can be easily forge welded
E. It is made by adding suitable percent�age of carbon to molten iron and subjecting the product to repeated hammering and rolling.
Explanation:
128. Solder is an alloy consisting of
A. tin, antimony, copper
B. tin and copper
C. tin and lead
D. lead and zinc
E. lead and copper.
Explanation:
129. The ultimate tensile strength and yield strength of most of the metals, when temperature falls from 0 to l00�C will
A. increase
B. decrease
C. remain same
D. first increase and then decrease
E. show unpredictable behavior.
Explanation:
130. Maximum percentage of carbon in ferrite is
A. 0.025%
B. 0.06%
C. 0.1%
D. 0.25%
E. 0.8%.
Explanation:
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