Category: Engineering Materials

A. providing corrosion resistance
B. improving machining properties
C. providing high strength at elevated temperatures
D. raising the elastic limit
E. improving the resilience and ductility

A. brittle
B. hard
C. ductile
D. tough
E. malleable

A. carbon
B. vanadium
C. manganese
D. cobalt
E. copper

A. the points where no further change oc-curs
B. constant for all metals
C. the points where there is no further flow of metal
D. the points of discontinuity
E. the points where major changes take place

A. silver
B. gold
C. copper
D. germanium
E. german silver

A. contains l.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 cerium) in the ladle. Graphite is in the nodular or spheroidal form and is well dispersed throughout the material
E. none of the above

A. molecular change
B. physical change
C. allotropic change
D. solidus change
E. atomic change

A. greater than 7
B. less than 7
C. equal to 7
D. pH value has nothing to do with neutral solution
E. none of the above

A. stages at which allotropic forms change
B. stages at which further heating does not increase temperature for some time
C. stages at which properties do not change with increase in temperature
D. there is nothing like points of arrest
E. none of the above

A. gun metal
B. bronze
C. bell metal
D. babbit metal
E. brass