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46. The following types of materials are usually the most ductile
A. face-centred cubic lattice
B. body-centred cubic lattice
C. hexagonal close-packed lattice
D. all of the above
E. none of the above.
Explanation:
47. The correct sequence for descending order of machinability is
A. grey cast iron, low carbon steel, wrought iron
B. low carbon steel, grey cast iron, wrought iron
C. wrought iron,low carbon steel, grey cast iron
D. wrought iron, grey cast iron, low carbon steel
E. grey cast iron, wrought iron, low carbon steel.
Explanation:
48. The hardness of steel primarily depends on
A. %age of carbon
B. %age of alloying elements
C. heat treatment employed
D. method of manufacture
E. shape of carbides and their distribu-tion in iron.
Explanation:
49. The crystal structure of brass is
A. F.C.C.
B. B.C.C.
C. H.C.P.
D. Orthorhombic crystalline structure
E. none of the above.
Explanation:
50. Malleable cast iron
A. contains lv7 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 cerium) in the ladle. Graphite is in the nodular or spheroidal form and is well dispersed throughout the material
E. none of the above.
Explanation:
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