Materials and Construction
Copper is dissolved from its ore by H₂SO₄ in a percolation tank made of

Reinforced concrete lined with lead
Wood
High silicon iron (14% Si)
Stainless steel

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Materials and Construction
Straight silicon steel (containing Si from 0.5 to 5%) because of their low hysterisis loss and high magnetic permeability are used for electrical appliances. Which of the following electrical appliances made of silicon steel contains maximum percentage of silicon (about 4%)?

Induction motors
High frequency transformers
Armature of small motors/generators
Generators and small motors

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