Materials and Construction
Which of the following materials may prove unsuitable for handling acetic acid (glacial & anhydrous) at 40°C?

Aluminium, copper, high silicon iron
Brass, cast iron, mild steel and tin
Silicone rubber, teflon, procelain and wood
Nickel, monel, stainless steel and graphite

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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%)?

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

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