Engineering Materials MCQs

[A]. in still air

[B]. slowly in the furnace

[C]. suddenly in a suitable cooling medium

[D]. any one of these

[A]. chromium

[B]. silicon

[C]. manganese

[D]. magnesium

[A]. 600°C

[B]. 700°C

[C]. 723°C

[D]. 913°C

[A]. 30%

[B]. 45%

[C]. 55%

[D]. 70%

[A]. Yes

[B]. No

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[A]. removing the impurities like clay, sand etc. from the iron ore by washing with water

[B]. expelling moisture, carbon dioxide, sulphur and arsenic from the iron ore by heating in shallow kilns

[C]. reducing the ore with carbon in the presence of a flux

[D]. all of the above

[A]. Bessemer process

[B]. Open hearth process

[C]. Duplex process

[D]. Electric process

[A]. controls the grade of pig iron

[B]. acts as an iron-bearing mineral

[C]. supplies heat to reduce ore and melt the iron

[D]. forms a slag by combining with impurities

[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

[A]. brittleness

[B]. ductility

[C]. malleability

[D]. plasticity