Materials and Construction
Specify the material of construction suitable for handling concentrated HNO₃ at 100°C.

Stainless steel
High silicon iron, Kel-F and teflon
Tin and wood
Silicone rubber

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

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