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Materials and Construction

Materials and Construction
Rotary driers are generally made of

Cast iron
Tin lined with refractory bricks
High silicon iron (14% Si)
Mild steel

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

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

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Materials and Construction
An alloy used as thermocouple material comprises of 40% nickel and 60% copper.

Constantan
German silver
Chromel
Kanthal

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Materials and Construction
Silico-manganese steels (containing 0.7% Mn, 0.5% C and 2% Si)

Are used for leaf and coiled springs
Do not require heat treatment for any of its applications
Is tempered at 850°C
Do not have good resilience properties

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Materials and Construction
The maximum percentage of chromium that can be added to steel is about

18
30
12
24

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Materials and Construction
Shock resisting steels should possess high

Wear resistance
Hardness
Tensile strength
Toughness

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MORE MCQ ON Materials and Construction

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