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Materials and Construction

Materials and Construction
The chlorinator used in the manufacture of DDT is made of

Glass lined steel
Teflon
Bakelite
Glass

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Materials and Construction
Presence of silicon in steel

None of these
Is in the form of free Si
Indicates that steel is not deoxidised properly
Decreases the blow holes formation tendency in castings

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Materials and Construction
Cast iron and steel pipes are produced by __________ casting.

True centrifugal
Die
Slush
Investment

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Materials and Construction
Chilled iron castings are

None of these
Easily machinable
Soft on surface
Highly wear resistant

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Materials and Construction
The largest consumption of zinc for alloys is in the making of

Die casting alloys
Bearing metal
Brazing solder
Brasses

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Materials and Construction
Telfon (PTFE) is corroded by

Sulphuric acid
Hydrochloric acid (95%)
None of these
Hydrochloric acid (10%)

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