Select insulating materials for following parts : (i) Insulation between heating element and base plate of electric iron. (ii) Insulation used over copper or aluminium conductor used for making coils. (iii) Transformer bushings. (iv) Insulation between transmission line and pole.

Select insulating materials for following parts : (i) Insulation between heating element and base plate of electric iron. (ii) Insulation used over copper or aluminium conductor used for making coils. (iii) Transformer bushings. (iv) Insulation between transmission line and pole.
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1 Answer

Answer :

Parts
Insulating Materials 
Insulation between heating element and base plate of electric iron.
Mica
Insulation used over copper or aluminium conductor used for making coils. 
Impreganted cotton, enameled insulation. silk or resins  
Transformer bushings
Porcelain 
Insulation between transmission line and pole.
Porcelain
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