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Materials and Construction

Materials and Construction
Which of the following is not an alloy of copper?

Muntz metal
Admirability gun metal
Pewter metal
German silver

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Materials and Construction
Most suitable material for high pressure vessel operating at 500 atm. and 500° C is

Molybdenum stainless steel
Mild steel
18/8 stainless steel
High silicon iron (14% Si)

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Materials and Construction
Balls in a ball mill are usually made of

Stainless steel
Bronze
Steel
Cast iron

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Materials and Construction
H₂SO₄ (< 50% concentration) is corrosive to

Glass, graphite, porcelain & stoneware
Rubber (butyl and hard), silicone rubber & teflon
Aluminium, mild steel, stainless steel, concrete & tin
Copper, cast iron & high silicon iron (14% Si)

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Materials and Construction
For spinning viscose rayon, the extrusion spinnerettes are made of

Platinum or gold alloys
Nickel
Aluminium
High carbon steel

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Materials and Construction
Atmospheric corrosion of metals result from their

Slow oxidation
Fast hydration
Slow dehydration
Fast oxidation

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