Related Questions

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
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
__________ 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
Presence of high amount of silicon in cast iron
A Suppresses the decomposition of Fe3C
B Increases the formation of graphite
C Increases the contraction of the metal
D Reduces its fluidity
Addition of silicon to cast iron
A Promotes graphite module formation
B Improves its ductility
C Does not promote graphite flakes formation
D Increases the fluidity of molten metal
Silicon percentage in silicon steel used for electrical equipments is about
A 1
B 4.0
C 8
D 14

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