Materials and Construction
SO₃ is absorbed using H₂SO₄ in a

Stainless steel plate tower
Cast iron packed tower
Packed steel tower lined with acid proof bricks
None of these

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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%)?

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

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