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ENGINEERING MATERIALS IN EE

Engineering Materials in EE
In electrical machines the material preferred for pole shoes of electromagnets is

 lead.
 aluminium.
 pure iron.
 copper.

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Engineering Materials in EE
Which of the following gives materials in order of decreasing values of permeability?

 Silver, copper, aluminium, iron.
 Cobalt, nickel, aluminium, iron.
 Pure iron, silicon iron, aluminium, bismuth.
  Permalloy, nickel, air, water.

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