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Materials and Construction

Materials and Construction
The main constituent of carborundum is __________ carbide.

Calcium
Boron
Aluminium
Silicon

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Materials and Construction
Nitriding of steel is done (in electric furnace) at __________ °C.

1720
2210
510
910

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Materials and Construction
Glass is corroded by

None of these
Sulphuric acid
Fluorine (dry or wet)
Phosphoric acid

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Materials and Construction
Galvanising (i.e., zinc coating) of steel sheets is done to

Neither A nor B
Both A & B
Prevent its rusting by contact with corrosive atmosphere
Protect the base metal by cathodic protection

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Materials and Construction
For platinum thermocouples, lead wires are made of

Copper & iron
Copper & copper-nickel alloys
Tin & nickel
Iron & nickel

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Materials and Construction
In the Kraft process of sulphate paper pulp manufacture, the black liquor and the white liquor storage tank is made of

Wood
Concrete
Porcelain
Steel

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