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Materials and Construction

Materials and Construction
Ball bearings are generally made of

Malleable cast iron
Chrome carbon steel
Plain carbon steel
Stainless steel

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Materials and Construction
Stainless steel is not corroded by

Saturated brine
Hydrochloric acid (10%)
Nitric acid (10%)
Sulphuric acid (10%)

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Materials and Construction
Austenitic manganese steel used for making jaws of crushing machines contains about __________ percent manganese.

44021
44179
3.5-4.5
1.5-2

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Materials and Construction
Nickel and copper are the basic constituents of

German silver
Monel metal
Inconel
Hastelloy

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

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

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Materials and Construction
In order to be called steel, an alloy should have iron percentage greater than

50
70
90
80

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