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An important property of malleable cast iron in comparison to grey cast iron is the high
A Compressive strength
B Ductility
C Carbon content
D Hardness
Malleable 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 cerium) in the ladle. Graphite is in the nodular or spheroidal form and is well dispersed throughout the material
Malleable cast iron is produced
A By adding magnesium to molten cast iron
B By quick cooling of molten cast iron
C From white cast iron by annealing process
D None of these
When filing or machining cast iron makes our hands black, then it shows that ________ is present in cast iron.
A Cementite
B Free graphite
C Both A and B
D None of these
White cast iron as compared to grey cast iron is
A More durable
B Very brittle
C Very hard
D All of the above
When carbon in the cast iron is principally in the form of graphite, the cast iron will be of
A Brown colour
B Yellow colour
C White colour
D Grey colour
Nodular cast iron is produced by adding ________ to the molten cast iron.
A Nickel
B Chromium
C Copper
D Magnesium
__________ of grey cast iron produces white cast iron.
A Tempering
B Rapid heating
C Rapid cooling
D Slow cooling
Addition of small amount of __________ to grey cast iron is done to produce nodular grey cast iron.
A Manganese
B Phosphorous
C Magnesium
D Chromium
If a building "b' feet high casts a shadow 'f' feet long , then , at the same time of day, a tree 't' feet high will cast will cast a shadow how many feet long?
A (ft)/b
B (fb)/t
C b/(ft)
D (fb)/f

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