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Materials and Construction

Materials and Construction
Presence of even very minute amount (say 0.1%) of __________ in copper, reduces its electrical conductivity very seriously.

Both B and C
Antimony
Arsenic
Bismuth

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Materials and Construction
A bearing metal should not have

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

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Materials and Construction
Which of the following is produced by addition polymerisation?

Urea-formaldehyde
Dacron
Polybutadiene
Phenol formaldehyde

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Materials and Construction
Brine (15% concentration) can be stored in a vessel made of

None of these
Cast iron
Monel
Karbate

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Materials and Construction
Mild steel storage vessels are suitable for the storage of

Fatty acids
Anhydrous ammonia
Sulphuric acid (25%)
Hydrochloric acid (95%)

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Materials and Construction
A hardness depth of about 3 mm can be achieved by induction hardness in __________ seconds.

500
250
5
100

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