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Materials and Construction

Materials and Construction
A hardened steel essentially contains

None of these
Sorbite
Martensite
Troostite

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Materials and Construction
Presence of even 0.005% of __________ in copper makes it highly brittle, rendering it useless for wire-drawing.

Antimony
Arsenic
Oxygen
Bismuth

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Materials and Construction
Ceramic materials are

Always bad heat conductors
Stronger in compression than in tension
Always amorphous in nature
Organic in nature

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Materials and Construction
The metals occuring at the lower most position in the electromotive series

Are very brittle
Do not resist corrosion
Resist corrosion very strongly
Are heat insulators

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Materials and Construction
Graphite is a good

Both B & C
Conductor of heat
Thermal & electrical insulator
Conductor of electricity

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Materials and Construction
'Semi steel' is

Both A & B
Produced by adding 10-20% steel to the cupola charge
Stronger than cast iron
Neither A nor B

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