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Materials and Construction

Materials and Construction
Which of the following constituents of cast iron is mainly responsible for imparting it an anti-corrosive property?

Phosphorus
Sulphur
Silicon
None of these

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Materials and Construction
Which of the following is the hardest material?

Corrundum
Quartz
Topaz
Flourite

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Materials and Construction
Presence of cobalt in steel improves its

None of these
Tensile strength
Cutting ability
Corrosion resistance

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Materials and Construction
Ceramic recuperators are generally made of

Fireclay bricks
Silicon carbide
Calcium carbide
High alumina bricks

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Materials and Construction
A bearing metal should not have

Enough plasticity
Low co-efficient of friction
High toughness
Low thermal conductivity

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Materials and Construction
A hardened steel essentially contains

Martensite
Sorbite
Troostite
None of these

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