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Materials and Construction

Materials and Construction
Mild steel is used for making

Drop forging
Fish plates
Channels
Die block

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Materials and Construction
Coke oven regenerators are made of __________ bricks.

Low thermal conductivity
Silica
Fire clay
High electrical conductivity

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Materials and Construction
Platinum and silver are corroded by

Caustic soda solution
None of these
Phosphoric acid
Sulphuric acid (10%)

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Materials and Construction
Ferric stainless steels compared to austenitic stainless steels

Have lower corrosion resistance
All of these
Are harder to fabricate
Are less ductile and hence less suitable for cold pressing

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Materials and Construction
A chemical change takes place when iron

None of these
Melts
Rusts
Is heated

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Materials and Construction
__________ is a donor impurity for semi-conductors.

None of these
Boron
Antimony
Gallium

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