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Materials and Construction

Materials and Construction
Presence of cobalt in steel improves its

Cutting ability
Tensile strength
None of these
Corrosion resistance

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Materials and Construction
Which of the following would not be a suitable material of construction for handling aqueous hydrofluoric acid (HF) at 100°C ?

Stainless steel
Graphite
Kel-F and teflon
Monel

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Materials and Construction
Very high sulphur in pig iron makes

Its brittle and malleable
All of these
Its hard and machinable
Its casting unsound

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Materials and Construction
A metallic alloy in general as compared to their pure metal components is

Having lower hardness, reactivity and fusibility
More corrosion resistant
Having higher melting point
Having lower electrical conductivity

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Materials and Construction
Which of the following alloy steels has the energy saving properties making it suitable for use in electrical machines?

Molybdenum steel
Silicon steel
None of these
Chromium steel

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Materials and Construction
High resistance electrical heating elements/wire are not made of

Nimonic alloys
Nichrome
Kanthal wire
Marageing steel

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