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Engineering Materials - Interview Questions and Answers

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41. Which one of the following metals would work-harden more quickly than the others?
A. copper
B. brass
C. lead
D. silver
E. aluminium.
Explanation:
42. The tensile strength of wrought iron is maximum
A. along the lines of slag distribution
B. perpendicular to lines of slag dis-tribution
C. uniform in all directions
D. unpredictable
E. none of the above.
Explanation:
43. Ductile cast iron
A. contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron
B. is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
C. is produced by annealing process. It is soft, tough and easily machined metal
D. is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material
E. none of the above.
Explanation:
44. Balls for ball bearings are made of
A. cast iron
B. mild steel
C. stainless steel
D. carbon-chrome steel
E. high carbon steel.
Explanation:
45. Taps, dies and drills contain carbon
A. below 0.5%
B. below 1%
C. above 1%
D. above 2.2%
E. nil.
Explanation:
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